JP2001177570A - Communication network system, and slave unit, master unit, repeater and synchronization controlling method in communication network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a communication network system in which synchronization accuracy can be improved. SOLUTION: This communication network system which is provided with slave units 1a to 1b performing a periodical timing operation and a master unit 2 holding timing for synchronization control Synchronous control information for synchronization control is exchanged between the slave units 1a to 1b and the master unit 2 to synchronize the timing of the units 1a to 1b with the timing of the unit 2. The communication network system is further provided with a calculating part that calculates the deviation between the timing of the units 1a to 1b and the timing of the unit 2 including the delay time of repeaters 3a to 3e, the units 1a to 1b and the unit 2 and an adjusting part which adjusts the timing of the units 1a to 1b on the basis of the calculation results of the calculating part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication network system for operating a master device and at least one slave device accommodated in the master device in synchronization with a periodic timing, a slave device in the communication network system, The present invention relates to a master device, a relay device, and a synchronization control method in a communication network system, and more particularly to a communication network system for improving synchronization accuracy, a slave device in a communication network system, a master device, a relay device, and a synchronization control method in a communication network system. .

[0002]

2. Description of the Related Art As a conventional communication network system, for example, there is a sampling signal synchronization system disclosed in Japanese Patent Publication No. 5-42209. FIG. 21 is an explanatory diagram showing a configuration of a conventional communication network system using the sampling signal synchronization method. This communication network system is composed of a master device 8 and a slave device 7 that measure the power system at predetermined SP (sampling) intervals.

[0003] The master device 8 and the slave device 7 are connected by a bidirectional transmission path, and when the SP cycle is T, the SP information (measured value) generated for each T is adjusted to the SP time (measurement timing). And send to each other. Further, the master device 8 and the slave device 7 periodically transmit synchronization control information for synchronization control in the SP information in order to make the respective SP times coincide with each other. Here, the SP time mismatch occurs at the time of device startup, at the time of device failure, and due to the frequency difference between the operation clock of the master device 8 and the operation clock of the slave device 7.

Next, a description will be given of a synchronization procedure for matching the SP time between the master device 8 and the slave device 7. FIG.
FIG. 2 is an explanatory diagram showing a conventional synchronization procedure between the master device 8 and the slave device 7. For the sake of simplicity, the master device 8 and the slave device 7 have their own SP time (S
Only the SP information including the synchronization control information among the SP information transmitted at each (P time) is shown. The master device 8 and the slave device 7 repeat the value of 0 to 11 every SP period T.
A P number is always generated, and this SP number is stored in SP information to be transmitted. In the illustrated example, the SP time of the master device 8 is delayed by ΔT from the SP time of the slave device 7, and the SP number is also delayed by 6. The transmission delay time Td of the transmission line has the same value in both directions.

In the conventional synchronization procedure, the master device 8
First, for each SP time of the own device having the SP number “0”, the downlink (from the master device 8 to the slave device 7) SP information including the synchronization control information is transmitted to the slave device 7 (S51). In addition, here, for the sake of simplicity, SP
The transmission is performed at the SP time of the own device having the number “0”, but the transmission may be performed at a time other than “0”. After the transmission delay time Td, the slave device 7 receives the downlink SP information and an interval Ts from the SP time (SP number = 9 in the example in the figure) of the own device immediately before receiving the downlink SP information to the time at which it was received. Is measured.

[0006] The slave device 7 sets the master device 8 at the SP time (the SP number at this time is RA1 (10 in the example in the figure)) at its own device after receiving the downlink SP information.
Then, upstream SP information (from the slave device 7 to the master device 8) including the Ts value is transmitted (S52). After the transmission delay time Td, the master device 8 receives the uplink SP information, and starts from the SP time (the SP number at this time is assumed to be SA2 (7 in the example in the figure)) of the own device immediately before receiving the uplink SP information. The time Tm up to the time when the is received is measured.

The relationship between the delay ΔT of the SP time of the master device 8 with respect to the SP time of the slave device 7, the transmission delay time Td, and the measurement times Ts and Tm is expressed by the following equation. Td + ΔT = N · T + Ts (1) Expression Td = M · T + Tm + ΔT (2) where N is the slave device from the SP time of the slave device 7 which is close to the time when the master device 8 transmits the downstream SP information. 7 is the S until the SP time, which is the reference for measuring Ts.
The number of P periods, M, is defined as S from the SP time of the master device 8 which is close to the time when the slave device 7 has transmitted the uplink SP information to the SP time which is the reference at which the master device 8 measures Tm.
This is the number of P cycles. ΔT included in the expression (1) and ΔT included in the expression (2) are strictly different due to a frequency difference between the operation clock of the master device 8 and each operation clock of the slave device 7. Is so small that it is ignored.

From equations (1) and (2), the following equation is obtained. ΔT = (N−M) T / 2 + (Ts−Tm) / 2 (3) Expressions The values of N and M in Expressions (1) and (2) are determined from SA2 by the following expression. When SA2 is an odd number, M = (SA2-1) / 2, N = (SA2-1) / 2 (4) When SA2 is even and Tm ≧ Ts, M = SA2 / 2-1, N = SA2 / 2 ... Equation (5) When SA2 is an even number and Tm <Ts: M = SA2 / 2, N = SA2 / 2-1 ... Equation (6)

The master device 8 determines ΔT from equations (3) to (6) and advances its own SP time by ΔT. In the example of the figure, since SA2 = 7, N = 3, M = 3, and Δ
ΔT is determined as T = (Ts−Tm) / 2. If ΔT becomes negative as a result of the calculation of the expression (3), the self S
The P time is delayed by ΔT. Thus, the master device 8
And the SP time of the slave device 7 are finely adjusted.

Next, a description will be given of a synchronization procedure for matching SP numbers, which is a coarse adjustment of SP time. Slave device 7
Is determined by the following equation from RA1 and SA2. When SA2 is odd ε = RA1- (SA2 + 1) / 2 (7) When SA2 is even and Tm ≧ Ts ε = RA1-SA2 / 2-1 (8) When SA2 is even and Tm <Ts Case ε = RA1−SA2 / 2 Expression (9) The master device 8 determines ε from Expressions (7) to (9),
The SP number in the own device is advanced by ε. In the example shown,
Since SA2 = 7 and RA1 = 10, ε = 6 is obtained. If ε is negative as a result of the calculation of the equations (7) to (9), the own device SP number is delayed by ε. Thereby, the SP number of the master device 8 and the SP number of the slave device 7
The numbers match.

[0011]

However, according to the above-mentioned prior art, since the timing adjustment is performed on the assumption that the round-trip transmission delay time of the transmission path is equal, the SP information and the synchronization control are controlled between the devices. In the case of transmitting and receiving device management information in addition to information, when transmission of synchronization control information and transmission of other information conflict, transmission delay time fluctuates, proper timing adjustment cannot be performed, and synchronization accuracy decreases. There was a problem of doing.

When the above-mentioned conventional technique is applied to a large-scale communication network system provided with a plurality of slave devices and at least one multiplexing device (relay device), synchronization control information from a certain slave device is used. And the relay of other information from other slave devices compete in the multiplexing device, the relay time of the synchronization control information fluctuates, the transmission delay time tends to fluctuate, and the synchronization accuracy further decreases. There was a point.

[0013] Variations in the relay time in the multiplexing device increase in proportion to the number of passes of the multiplexing device between the slave device and the master device, so that the larger the network, the lower the synchronization accuracy. Most of the fluctuation of the transmission delay time of the synchronization control information is caused by the conflict between the transmission of the synchronization control information and the transmission of other information in each device, but the operation clock phases of each device are different. The case also occurs due to phase matching. However, the proportion is small relative to the fluctuations due to competition.

The present invention has been made in view of the above, and has a communication network system capable of improving synchronization accuracy, a slave device, a master device, a relay device in the communication network system, and a synchronization control method in the communication network system. The purpose is to obtain.

[0015]

Means for Solving the Problems To solve the above-mentioned problems,
In order to achieve the object, in the communication network system according to the present invention, at least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, and the slave device A relay device for relaying information between the master device and the master device, and reciprocating the synchronization control information for synchronization control between the slave device and the master device, the timing of the slave device and the timing of the master device Calculating means for calculating the difference between the timing of the slave device and the timing of the master device, including the delay time in the relay device, the slave device, or the master device, in the transmission of the synchronization control information. And the timing of the slave device based on the calculation result of the calculation means. Characterized by comprising adjustment means for settling, the.

According to the present invention, the calculating means calculates the difference between the timing of the slave device and the timing of the master device including the delay time in the transmission of the synchronization control information in the slave device, the master device or the relay device, The adjusting means adjusts the timing of the slave device based on the calculation result of the calculating means. This makes it possible to perform timing adjustment in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

In the communication network system according to the next invention, the slave device, the master device, or the relay device that transmits the synchronization control information stores the information on the delay time of the own device in the synchronization control information. Features.

According to the present invention, the slave device, the master device, or the relay device that transmits the synchronization control information stores the information of the delay time in the own device in the synchronization control information, so that the transmission source device is returned. Information on the delay time can be obtained from the synchronization control information that has been received.

In the communication network system according to the next invention, the slave device, the master device, or the relay device that transmits the synchronization control information includes information stored in the synchronization control information based on a delay time in the own device. Is updated.

According to the present invention, the slave device, the master device, or the relay device that transmits the synchronization control information updates the information stored in the synchronization control information based on the delay time in its own device, so that the transmission source of the transmission source is updated. The device can obtain information based on the delay time from the returned synchronization control information.

[0021] In the communication network system according to the next invention, the slave device or the master device transmits the synchronization control information to the master device or the slave device via the relay device. The slave device, information of the time from the timing of the own device immediately before receiving the synchronization control information to the reception of the synchronization control information and the information of the time from the timing of the own device immediately before transmitting the synchronization control information to the transmission of the synchronization control information, The synchronization control information is stored and transmitted to the slave device or the master device via the relay device, and the relay device receives information on the time from when the synchronization control information is received until when the synchronization control information is transmitted. The relay is stored in the control information, and the calculating unit is configured to execute the process immediately before the slave device or the master device receives the synchronization control information. Calculating a difference between the timing of the slave device and the timing of the master device based on information on a time from the timing of the slave device or the master device to reception and information on the time stored in the synchronization control information. It is characterized by.

According to the present invention, the slave device (master device) transmits the synchronization control information to the master device (slave device) via the relay device, and the master device (slave device) receives the synchronization control information. The information on the time from the timing immediately before the reception to the reception of the synchronization control information and the information on the time from the timing immediately before the return of the synchronization control information to the return of the synchronization control information are stored in the synchronization control information, and the slave device (master device) is connected via the relay device. ), The relay device stores the information on the time from when the synchronization control information is received until it is transmitted to the received synchronization control information, relays the information, and calculates the returned synchronization control information. The timing of the slave device (master device) is determined based on the information on the time from the timing immediately before the reception to the reception until the reception and the time information stored in the synchronization control information. Calculating a deviation between the timing of grayed and master device. This makes it possible to perform timing adjustment in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

In the communication network system according to the next invention, the slave device or the master device transmits the information of the time from its own timing immediately before transmitting the synchronous control information to the time of transmitting the synchronous control information to the synchronous control device. The information is stored in the information and transmitted to the master device or the slave device via the relay device, and the master device or the slave device receives the information of the time from the timing of the own device immediately before receiving the synchronization control information to the time of receiving the synchronization control information. And information of the time from the timing of its own device immediately before transmitting the synchronization control information to the time of transmission, stored in the synchronization control information,
Transmit to the slave device or the master device through the relay device, the relay device, or the sum of the time from the reception of the synchronization control information until transmission and the time indicated in the received synchronization control information or Calculating a difference, updating the time information stored in the synchronization control information, and relaying the updated information, wherein the calculating unit is configured to execute the slave device or the master device immediately before the slave device or the master device receives the synchronization control information; The difference between the timing of the slave device and the timing of the master device is calculated based on the information on the time from the timing of receiving to the reception and the information on the time stored in the synchronization control information.

According to the present invention, the slave device (master device) stores, in the synchronization control information, information on the time from the timing immediately before transmitting the synchronization control information to the time when the synchronization device transmits the synchronization control information, and stores the information in the master device via the relay device. (Slave device), and the master device (slave device) transmits the information from the time immediately before receiving the synchronization control information to the time until the synchronization control information is received, and the time from the time immediately before returning the synchronization control information to the time until the synchronization control information is returned. Information is stored in the synchronization control information and returned to the slave device (master device) via the relay device. The relay device receives the synchronization control information and transmits the synchronization control information and the received synchronization control information. Calculates the sum or difference from the time indicated in (1), updates the time information stored in the synchronization control information and relays it, and calculates the slave information in the returned synchronization control information. Device on the basis of the (master device) is time stored in the time information and synchronization control information to be received from the timing immediately before the received information to calculate the deviation between the timing of the timing and the master device of the slave device. This makes it possible to perform timing adjustment in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

In the communication network system according to the next invention, the slave device or the master device transmits the information on the time from its own timing immediately before transmitting the synchronization control information to the transmission of the synchronization control information by the synchronization control. Stored in the information, transmitted to the master device or the slave device via the relay device, the master device or the slave device, the time from the timing of the own device immediately before receiving the synchronization control information until receiving, Calculates the time indicated in the synchronization control information and the time from transmission of the own device immediately before transmitting the synchronization control information to transmission of the synchronization control information, and updates the information of the time stored in the synchronization control information. The relay device transmits the synchronization control information to the slave device or the master device via the relay device. To update the time information of the sum or difference stored operation on the synchronization control information between the time and the time indicated in the received synchronization control information to be relayed,
The calculating means is stored in the synchronization control information and information on the time from when the slave device or the master device immediately before receiving the returned synchronization control information to the timing when the slave device or the master device receives the returned synchronization control information. A timing difference between the timing of the slave device and the timing of the master device is calculated based on time information.

According to the present invention, the slave device (master device) stores, in the synchronization control information, information on the time from when the slave device (master device) transmits the synchronization control information to when the slave device transmits the synchronization control information, and transmits the information via the relay device. To the master device (slave device), and the master device (slave device) receives the time from the timing of the own device immediately before receiving the synchronization control information to the reception of the synchronization control information, the time indicated in the synchronization control information, and the synchronization. The operation from the timing of the own device immediately before returning the control information to the time until the return is performed, and the information of the time stored in the synchronization control information is updated, and the information is updated to the slave device (master device) via the relay device. The relay device returns and calculates the sum or difference between the time from when the synchronization control information is received to when it is transmitted and the time indicated in the received synchronization control information, and stores the sum or difference in the synchronization control information. The information is updated and relayed, and the calculating unit stores the information on the time from when the returned synchronization control information is received immediately before the slave device (master device) receives it to the synchronization control information. The difference between the timing of the slave device and the timing of the master device is calculated based on the time information. This makes it possible to perform timing adjustment in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

[0027] In the communication network system according to the next invention, at least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, and the slave device and the master device. And at least one relay device for relaying information between, comprising: a communication network system that transmits synchronization control information for synchronization control and synchronizes the timing of the slave device and the timing of the master device, The slave device, the master device, and the relay device transmit a special code having a unique bit pattern in preference to other information, and reciprocate between the slave device and the master device. Can store and transmit information based on the arrival time of the special code in the synchronization system information. The features.

According to the present invention, the slave device, the master device, and the relay device transmit the special code of the unique bit pattern with higher priority than other information, and make the slave device reciprocate between the slave device and the master device. The master device or the slave device stores the information based on the arrival time of the special code in the synchronization control information and transmits it. Accordingly, it is not necessary to consider the delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, and appropriate timing adjustment can be performed.

In the slave device in the communication network system according to the next invention, the slave device operates at a periodic timing and transmits synchronization control information for synchronization control between the master device in the communication network system and its own device. A slave device in a communication network system that reciprocates and synchronizes the timing of the master device with the timing of its own device, calculates the slave device in the transmission of the synchronization control information, including the delay time in the master device, the relay device, or the own device. And adjusting the timing of the own device based on the difference between the timing of the master device and the timing of the own device.

According to the present invention, the adjusting means detects the difference between the timing of the master device and the timing of the own device calculated including the delay time in the own device, the master device or the relay device in transmitting the synchronization control information. Based on this, the timing of the own device is adjusted. This makes it possible to perform timing adjustment in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

In the slave device in the communication network system according to the next invention, the slave device in the communication network system that performs a periodic timing operation and synchronizes the timing of the master device with the timing of its own device is unique. A special code for synchronous control of a bit pattern is transmitted with priority over other information.

According to the present invention, a special code for synchronization control of a unique bit pattern is transmitted with higher priority than other information, so that a slave device, a master device, or a relay device in transmission of synchronization control information can transmit. There is no need to consider the delay time, and appropriate timing adjustment can be performed.

In the master device in the communication network system according to the next invention, the timing for synchronization control is held, and the synchronization control information for synchronization control is transmitted between the slave device in the communication network system and its own device. A master device in a communication network system that reciprocates and synchronizes the timing of the slave device with the timing of its own device, wherein information on delay time in its own device is stored in the synchronization control information and transmitted. .

According to the present invention, by storing information on the delay time in the transmission of the own apparatus in the synchronization control information,
The timing can be adjusted in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device.

In the master device in the communication network system according to the next invention, the timing for synchronization control is held, and the synchronization control information for synchronization control is transmitted between the slave device in the communication network system and its own device. A master device in a communication network system that reciprocates and synchronizes the timing of the slave device with the timing of the own device, updates and transmits information stored in the synchronization control information based on a delay time in the own device. It is characterized by.

According to the present invention, the information stored in the synchronization control information is updated based on the delay time in the transmission of the own device, whereby the delay in the slave device, the master device, or the relay device in the transmission of the synchronization control information is updated. The timing can be adjusted in consideration of time.

The master device in the communication network system according to the next invention holds synchronization control timing, transmits synchronization control information for synchronization control to a slave device in the communication network system, and In the master device in the communication network system that synchronizes the timing of the own device with the timing of the own device, a special code for synchronization control of a unique bit pattern is transmitted with priority over other information, and based on the reception time of the special code. Information is stored in the synchronization control information and transmitted.

According to the present invention, a special code for synchronization control of a unique bit pattern is transmitted prior to other information, and information based on the reception time of the special code is stored in the synchronization control information and transmitted. Accordingly, it is not necessary to consider the delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, and appropriate timing adjustment can be performed.

A relay device in a communication network system according to the next invention is a relay device in a communication network system for relaying synchronization control information for synchronization control between a slave device and a master device in the communication network system. And storing the delay time information in the own apparatus in the synchronization control information and relaying the information.

According to the present invention, the delay time in the slave device, the master device or the relay device in the transmission of the synchronization control information is reduced by storing the information of the delay time in the relay of the own device in the synchronization control information and relaying the information. Considerable timing adjustment can be performed.

In the relay device in the communication network system according to the next invention, the relay device in the communication network system relays synchronization control information for synchronization control between the slave device and the master device in the communication network system. And updating and relaying the information stored in the synchronization control information based on the delay time in the own device.

According to the present invention, the information stored in the synchronization control information is updated and relayed based on the delay time in the relay of the own device, whereby the slave device, the master device or the relay device in the transmission of the synchronization control information is updated. , The timing can be adjusted in consideration of the delay time.

In the relay device in the communication network system according to the next invention, the relay device in the communication network system that relays information between the slave device and the master device in the communication network system has a unique bit pattern. It is characterized in that a special code for synchronization control is transmitted prior to other information.

According to the present invention, by transmitting the special code of the unique bit pattern with priority over other information, the slave device in the transmission of the synchronization control information,
There is no need to consider the delay time in the master device or the relay device, and appropriate timing adjustment can be performed.

In a synchronization control method in a communication network system according to the next invention, there is provided at least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, and the slave device. And at least one relay device for relaying information between the slave device and the master device, wherein the slave device or the master device has a unique timing at the timing of the slave device or the master device. A first transmission step of transmitting a special code of a special bit pattern in preference to other information, and in the slave device or the master device,
A second transmission step of transmitting synchronization control information for synchronization control after the first transmission step;
A first relay step of relaying the special code transmitted in the transmitting step in preference to other information, and a second relay step of relaying the synchronization control information transmitted in the second transmitting step in the relay apparatus. And the master device or the slave device retains information on the time from when the master device or the slave device receives the special code immediately before receiving the special code relayed in the first relay process. 1 and the master device or the slave device returns the special code relayed in the first relaying process with priority over other information at the timing of the master device or the slave device after receiving the special code. A first return step, and the synchronization control information relayed in the second relay step in the master device or the slave device,
Storing information on the time held in the first holding step;
A second return step of returning, the relay apparatus, a third relay step of relaying the special code returned in the first return step in preference to other information, and the relay apparatus, A fourth relay step of relaying the synchronization control information returned in the second return step, and the slave device or the master device in the slave device immediately before receiving the special code relayed in the third relay process Alternatively, a second holding step of holding time information from the timing of the master device to reception, and information of the time stored in the synchronization control information relayed in the fourth relay step and the second holding step And adjusting the timing of the slave device based on the information on the time held in (1).

According to the present invention, in the slave device (master device), the special code of the unique bit pattern is transmitted with priority over other information at the timing of the slave device (master device). , The relay device relays the special code transmitted from the slave device (master device) with priority over other information, and transmits the synchronization control information transmitted from the slave device (master device). Information is relayed, and the master device (slave device) holds information on the time from the timing of the master device (slave device) to the time immediately before receiving the special code relayed by the relay device, and relays the information by the relay device. At the timing after the received special code is received, giving priority to other information and returning it to the synchronization control information relayed by the relay device. The relay device stores and returns the information of the transmitted time, the relay device relays the special code returned from the master device (slave device) with priority over other information, and returns the special code from the master device (slave device). The slave device (master device) relays the synchronization control information, holds information on the time from when the slave device immediately before receiving the special code relayed by the relay device to when it receives the special code, and relays the information by the relay device. The timing of the slave device is adjusted based on the time information stored in the synchronization control information and the held time information. This allows
There is no need to consider delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, and appropriate timing adjustment can be performed.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a communication network system, a slave device, a master device and a relay device in the communication network system and a synchronization control method in the communication network system according to the present invention will be described below in detail with reference to the drawings. I do. The present invention is not limited by the embodiment.

Embodiment 1 FIG. 1 is an explanatory diagram illustrating the configuration of the communication network system according to the first embodiment of the present invention. The communication network system includes a plurality of slave devices 1a to 1 that perform power system measurement at synchronously controlled SP (sampling) intervals, generate SP information, and simultaneously transmit SP information packets storing the SP information.
d, a master device 2 that collects and processes SP information packets from the slave devices 1a to 1d, and a slave device 1a.
-1d and at least one multiplexing device (relay device) 3a-3e connecting the master device 2 to the multiplexing device.

Each of the slave devices 1a to 1d generates SP information in synchronization with the SP time (timing) controlled synchronously with each other, and simultaneously transmits an SP information packet to the master device 2. The master device 2 includes the slave devices 1a to 1
Collect and process the SP information packet from d. Also,
The master device 2 holds the SP time for synchronization control. Note that the master device 2 may or may not perform measurement in accordance with its own SP time.

The multiplexers 3a to 3e are connected to the slave device 1
Packets received from a to 1d are multiplex-relayed to master device 2, and packets received from master device 2 are relayed to slave devices 1a to 1d. Also, the master device 2
Own SP time (SP time of own device) and each slave device 1a
Slave device 1 to match the SP time
One slave device is sequentially designated from a to 1d, and synchronization control with the designated slave device is performed. The designated slave device stores the information of the delay time at the time of transmission in the synchronization control packet storing the synchronization control information for synchronization control, and transmits the information to the master device 2 via the multiplexing devices (relay devices) 3a to 3e. Send. Multiplexer 3a for relaying synchronization control packets
3e store the information of the delay time at the time of relay in the synchronization control packet and relay.

The master device 2 stores the information based on the reception time of the synchronization control packet and the information of the delay time at the time of the return in the synchronization control packet and returns it. The slave device that has received the returned synchronization control packet, based on the information stored in the synchronization control packet and the information based on the time at which the own device received the synchronization control packet, shifts the SP time between its own device and the master device 2. To calculate the own SP time (SP time of the own device). The packet length of each packet in this communication network system may be fixed or variable. For example, IEEE802.3 or E
A Mac packet of the Ethernet may be used.

FIG. 2 is a block diagram showing a configuration of the slave devices 1a to 1d according to the first embodiment shown in FIG. Each of the slave devices 1a to 1d includes a sampling unit 11 that performs measurement in the SP cycle, a control unit 12 that controls each unit of the own device, and a transmission and reception unit 13 that transmits and receives packets to and from the outside. The control unit 12 controls the transmission / reception unit 13 at each SP time to transmit an SP information packet.
3 and transmits a synchronization control packet. In addition, the control unit 12 controls the S
The synchronization control packet includes a calculation unit 14 that calculates a difference between the P time and the SP time held by the master device 2, and an adjustment unit 15 that adjusts the SP time based on the calculation result of the calculation unit 14. Is returned, adjust the SP time.

FIG. 3 is a block diagram showing the configuration of the master device 2 according to the first embodiment shown in FIG. The master device 2 includes a control unit 21 that controls each unit of the master device 2, and a transmission and reception unit 22 that transmits and receives packets to and from the outside. The control unit 21 includes an information processing unit 23 that processes SP information stored in SP information packets from the slave devices 1a to 1d, a timing management unit 24 that counts own SP time, and a synchronization control unit that executes a synchronization procedure. 25,
have. The synchronization control unit 25 includes the slave devices 1a to
The synchronization procedure is executed by sequentially designating 1d.

FIG. 4 is a block diagram showing a configuration of the multiplexers 3a to 3e according to the first embodiment shown in FIG. Each of the multiplexing devices 3a to 3e includes a control unit 31 that controls each unit of the device, and a transmission / reception unit 32 that transmits and receives packets to and from the outside. When receiving the synchronization control packet, the control unit 31 includes a synchronization control unit 33 that stores information on the delay time until the transmission of the synchronization control packet in the received synchronization control packet and transmits the information.

FIG. 5 is an explanatory diagram showing the structure of the synchronization control packet used in the synchronization procedure according to the first embodiment. Here, for the sake of simplicity, the synchronization control packet is assumed to be independent of the SP information packet.
P information includes synchronization control information, and a synchronization control packet and SP
A packet that also serves as an information packet may be used.

The synchronization control packet includes a destination device ID area for storing the identifier of the destination device (destination device ID), a source device ID region for storing the identifier of the source device (source device ID), A packet length area for storing the length (packet length), a packet type area for storing the types (packet type) of SP information packets, device management packets, and synchronization control packets, and an SP number that increases by one for each SP cycle T And a path from each of the slave devices 1a to 1d to the master device 2 (up).
Is the delay time Ta which the synchronization control packet receives from each device.
1, a Ta1 area for storing Ta2 to Tan, a Ta2 area to a Tan area, a Ts area for the master device 2 to store the measurement time Ts, and the slave device 1a to
A Tb1 area for storing delay times Tb1, Tb2 to Tbn received by the synchronization control packet from each device on the path to 1d (downstream), a Tb1 area, a Tb2 area to a Tbn area, and a destination apparatus for checking the validity of the packet. An error detection code area for storing a code (error detection code). Here, the Ta1 area, the Ta2 area to the Tan area, the Tb1 area, and the Tb2 area to the Tbn area are provided for the number of passes through the multiplexer, and the SP numbers, Ta1, Ta2 to Tan, Ts,
Tb1, Tb2 to Tbn form synchronization control information.

In the above configuration, the operation of the communication network system according to the first embodiment will be described.
In the operation of the communication network system, the master device 2 appoints one slave device, for example, 1a in order from among the slave devices 1a to 1d. As a method of the nomination, for example, a device management packet for device management is used. The slave device 1a designated as the master device 2
A series of synchronization procedures for matching the SP times are executed. The master device 2 appoints all the slave devices 1a to 1d as described above, and after executing the above-described series of synchronization procedures, returns to the first slave device again and repeats the above (nominating in a cyclic order).

FIG. 6 is an explanatory diagram showing a synchronization procedure between the master device 2 and each of the slave devices 1a to 1d according to the first embodiment. In the figure, an example of a synchronization procedure between the master device 2 and the slave device 1d designated by the master device 2 is shown. Although this example shows a case where the SP cycle is longer than the transmission delay time, the same applies to a case where the SP cycle is shorter. For simplicity of description, the multiplexing device between the master device 2 and the slave device 1d is replaced by the multiplexing device 3a.
However, the same applies to a case where the signal passes through a plurality of multiplexers.

In this synchronization procedure, first, the slave device 1d transmits a synchronization control packet to the master device 2 in synchronization with its own SP time (S1). At this time,
The delay time Ta1 required from the own SP time to the transmission of the synchronization control packet is measured (estimated) and stored in the Ta1 area of the synchronization control packet and transmitted. Delay time T
a1 is a value that varies depending on the transmission status of another packet. That is, the delay time Ta1 fluctuates due to competition with transmission of another packet.

Upon receiving the synchronization control packet from the slave device 1d, the multiplexer 3a relays the synchronization control packet to the master device 2. At this time, the delay time Ta2 required from the reception of the synchronization control packet to the transmission thereof is measured (predicted), stored in the Ta2 area of the synchronization control packet, and transmitted (S2). The delay time Ta2 is a value that varies depending on the relay status of another packet. That is, the delay time Ta2 fluctuates due to competition with transmission of another packet. The master device 2 is connected to the slave device 1d via the multiplexing device 3a.
When the synchronization control packet is received, the time Ts required from the immediately preceding own SP time to the reception of the synchronization control packet is measured and held. Then, the synchronization control packet is returned to the slave device 1d in synchronization with the next own SP time (S3).

At this time, the delay time Tb1 that would be required from the own SP time to the transmission of the synchronization control packet is measured (estimated), and the respective times Ta1, Ta2 originally stored in the received synchronization control packet, and The time Ts held at the time of reception and the measured (predicted) delay time Tb1 are stored in a predetermined area of the synchronization control packet and transmitted. The delay time Tb1 is a value that varies depending on the transmission status of another packet. That is, the delay time Tb1 fluctuates due to competition with transmission of another packet.

When receiving the synchronization control packet again, the multiplexing device 3a relays the packet to the slave device 1d. At this time, the delay time Tb2, which is required from the reception of the synchronization control packet to the transmission thereof, is measured (predicted), stored in the Tb2 area of the synchronization control packet, and transmitted (S4).
The delay time Tb2 is a value that varies depending on the relay status of another packet. That is, the delay time Tb2 fluctuates due to competition with transmission of another packet. Slave device 1d
Receives the synchronization control packet from the master device 2 via the multiplexing device 3a, and measures the time Tm required from the immediately preceding own SP time to the reception of the synchronization control packet.

As is apparent from FIG. 6, Ts and Tm in the above-mentioned prior art equation (3) are represented by Ts- (Ta1 +
Ta2) and Tm− (Tb1 + Tb2) are satisfied. ΔT = (N−M) T / 2 + {Ts− (Ta1 + Ta2) −Tm + (Tb1 + Tb2)} / 2 Expression (10) The slave device 1d calculates the shift ΔT of the SP time between the two devices from Expression (10). Then, the own SP time is corrected.

In FIG. 6, the number of multiplexing devices is one. However, when the master device 2 and the slave device 1d are connected via a plurality of multiplexing devices, the following generalized expression (10) is used. The formula holds. ΔT = (N−M) T / 2 + (Ts−ΔTa−Tm + ΔTb) / 2 (11) where ΔTa = Ta1 + Ta2 +... + Tan ΔTb = Tb1 + Tb2 +. , (11) to calculate the SP time difference ΔT between the two devices, and correct the own SP time.

As described above, according to the first embodiment,
In a large-scale communication network system in which one master device and a plurality of slave devices are connected by at least one multiplexing device, even when transmission of a synchronization control packet and transmission of another packet conflict with each other, synchronization control is performed. In each device transmitting the packet, in order to store the information of the delay time in the synchronization control packet, ΔT is calculated using Expression (11).
Can be calculated, and the SP times can be matched with extremely high accuracy.

Embodiment 2 Embodiment 2 of the present invention
In the first embodiment, the multiplexer that relays the synchronization control packet does not store the delay time information in the synchronization control packet, but adds the information to the delay time information stored in the synchronization control packet. It was made.
The basic configuration and operation are the same as those of the first embodiment. Only the operation relating to a series of synchronization procedures between the master device 2 and the slave device designated by the master device 2 and the format of the synchronization control packet are performed. Is different from the first embodiment, and only different parts will be described.

FIG. 7 is an explanatory diagram showing a configuration of a synchronization control packet used in a synchronization procedure between the master device 2 and each of the slave devices 1a to 1d according to the second embodiment of the present invention. Note that the basic configuration is the same as that of the synchronization control packet of the first embodiment, and the description of the same portions will be omitted, and only different portions will be described. The synchronization control packet according to the second embodiment includes the Ta1 area, Ta2 area to Tan area, and Tb of the synchronization control packet according to the first embodiment.
1 and the total value Ta of the delay time that the synchronization control packet receives from each device in the upstream instead of the Tb2 to Tbn regions.
And a Tb area for storing the total delay time Tb of the synchronization control packet received from each device in the downstream. In this case, the synchronization control information includes SP numbers, measurement times Ts, and total values Ta and Tb stored in these areas. The length of the synchronization control packet is constant irrespective of the number of passes through the multiplexer.

Next, a series of synchronization procedures between the master device 2 and the designated slave device 1d will be described with reference to FIG. The delay times Ta1, Ta2 to Ta
n, Tb1, Tb2 to Tbn, and times Ts, Tm
Are the same as those described in the first embodiment. In this synchronization procedure, first, the slave device 1d
The synchronization control packet is transmitted to the master device 2 in synchronization with the time (S11). At this time, the delay time Ta1 is measured (predicted), stored in the Ta area of the synchronization control packet, and transmitted.

Upon receiving the synchronization control packet from the slave device 1d, the multiplexing device 3a relays it to the master device 2. At this time, the delay time Ta2 is measured (predicted), the delay time Ta2 is added to the value stored in the Ta area of the synchronization control packet, and the added value is overwritten in the Ta area and transmitted (S12). Upon receiving the synchronization control packet, the master device 2 measures and holds the time Ts, and
The synchronization control packet is sent to the slave device 1 according to the P time.
It is returned to d (S13). At this time, the delay time T
b1 is measured (predicted). And the measured delay time T
b1 is stored in the Tb area of the received synchronization control packet,
Further, the stored time Ts is stored in the Ts area of the synchronization control packet and returned.

When the multiplexer 3a receives the synchronization control packet again, it relays it to the slave device 1d. At this time, the delay time Tb2 is measured (predicted), the delay time Tb2 is added to the value stored in the Tb area of the synchronization control packet, and the added value is overwritten in the Tb area and transmitted (S1).
4). Upon receiving the synchronization control packet, the slave device 1d measures the time Tm. The values Ta in the Ta region and the value Tb in the Tb region are represented by {Ta and Σ} in the above-described equation (11).
Since it corresponds to Tb, the following equation holds. ΔT = (N−M) T / 2 + (Ts−Ta−Tm + Tb) / 2 Expression (12) The slave device 1d calculates the shift ΔT of the SP time between its own device and the master device 2 from Expression (12). Calculate and correct own SP time.

As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the length of the synchronization control packet can be reduced, so that the transmission efficiency can be improved.
Further, since the storage positions of the times Ta and Tb are fixed, it is not necessary to assign storage positions to the respective devices in advance, and the device management can be simplified.

Embodiment 3 Embodiment 3 of the present invention
In Embodiment 1 described above, instead of each device transmitting the synchronization control packet storing delay time information in the synchronization control packet, information on delay time of each device and information stored in the synchronization control packet are not stored. Is calculated, and the information stored in the synchronization control packet is updated. The basic configuration and operation are the same as those of the first embodiment. Only the operation relating to a series of synchronization procedures between the master device 2 and the slave device designated by the master device 2 and the format of the synchronization control packet are performed. Is different from the first embodiment, and only different parts will be described.

FIG. 9 is an explanatory diagram showing a configuration of a synchronization control packet used in a synchronization procedure between master device 2 and each of slave devices 1a to 1d according to the third embodiment of the present invention. Note that the basic configuration is the same as that of the synchronization control packet of the first embodiment, and the description of the same portions will be omitted, and only different portions will be described. The synchronization control packet according to the third embodiment includes the Ta1 area, Ta2 area to Tan area, and Ts area of the synchronization control packet according to the first embodiment.
Area, Tb1 area, Tb2 area to Tbn area,
The master device 2, the slave devices 1a to 1d, and the multiplexing devices 3a to 3e have a Tc area for storing the operation result Tc. In this case, the synchronization control information is composed of the SP numbers stored in these areas and the operation result Tc. The length of the synchronization control packet is constant irrespective of the number of passes through the multiplexer.

Next, a series of synchronization procedures between the master device 2 and the designated slave device 1d will be described with reference to FIG. Note that the delay times Ta1, Ta2 to T
an, Tb1, Tb2 to Tbn, and times Ts, Tm
Are the same as those described in the first embodiment. In this synchronization procedure, first, the slave device 1d
The synchronization control packet is transmitted to the master device 2 in synchronization with the time (S21). At this time, the delay time Ta1 is measured (predicted), stored in the Tc area of the synchronization control packet, and transmitted.

Upon receiving the synchronization control packet, the multiplexing device 3a relays the packet to the master device 2. At this time, the delay time Ta2 is measured (predicted), the delay time Ta2 is added to the value stored in the Tc area of the synchronization control packet, and the added value is overwritten in the Tc area and transmitted (S22). Upon receiving the synchronization control packet via the multiplexing device 3a, the master device 2 measures and holds the time Ts, and
The synchronization control packet is sent to the slave device 1 according to the P time.
It is returned to d (S23). At this time, the delay time T
b1 is measured (predicted). Then, the following equation is calculated from the value Tc of the Tc area of the synchronization control packet, the measured delay time Tb1, and the held time Ts to obtain a new value Tc.
The data is overwritten on the area c and transmitted. Ts−Tc + Tb1 Equation (13)

When receiving the synchronization control packet again, the multiplexer 3a relays the packet to the slave device 1d. At this time, the delay time Tb2 is measured (predicted), the delay time Tb2 is added to the value stored in the Tc area of the synchronization control packet, and the added value is overwritten on the Tc area and transmitted (S
24). Upon receiving the synchronization control packet, the slave device 1d measures the time Tm required from the immediately preceding own SP time to the reception of the synchronization control packet. Since the value Tc stored in the received synchronization control information corresponds to Ts-ΣTa + ΣTb in the equation (11), the following equation holds. ΔT = (N−M) T / 2 + (Tc−Tm) / 2 Expression (14) The slave device 1d calculates a shift ΔT of the SP time between its own device and the master device 2 from Expression (13). Correct the own SP time.

As described above, according to the third embodiment, the same effects as those of the first and second embodiments are obtained, and the length of the synchronization control packet is further reduced, so that the transmission efficiency can be improved. Further, since the storage position of the time Tc is fixed, it is not necessary to assign the storage position to each device in advance, and the device management can be simplified.

Embodiment 4 FIG. 11 is an explanatory diagram illustrating the configuration of the communication network system according to the fourth embodiment of the present invention. This communication network system measures a power system at synchronously controlled SP intervals, generates SP information and simultaneously transmits an SP information packet, and a plurality of slave devices 4a to 4d. Master device 5 that collects and processes SP information packets
And at least one multiplexing device (relay device) 6a to 6e for connecting the slave devices 4a to 4d and the master device 5.
And

Each of the slave devices 4 a to 4 d generates SP information in synchronization with the SP time controlled synchronously with each other, and simultaneously transmits an SP information packet to the master device 5. The master device 5 collects and processes SP information packets from each of the slave devices 4a to 4d. Also, the master device 5
Holds the SP time for synchronization control. Note that the master device 5 may or may not perform measurement in accordance with its own SP time. The multiplexing devices 6a to 6e multiplex relay packets received from the slave devices 4a to 4d to the master device 5, and
From the slave devices 4a to 4d. Also, the master device 5 sequentially designates one slave device from the slave devices 4a to 4d so as to make the own SP time coincide with the SP time of each of the slave devices 4a to 4d, and performs synchronization control with the designated slave device. Do.

The designated slave device transmits a special code having a unique bit pattern with priority over other packets, and then transmits a synchronization control packet for synchronization control. The multiplexing devices 6a to 6e relay the special code with higher priority than other packets, and relay the synchronization control packet. The master device 5 returns the special code with higher priority than other packets, and stores information based on the reception time of the special code in the synchronization control packet and returns it.

The slave device that has received the returned special code and the synchronization control packet determines, based on the information based on the time at which the own device received the special code and the information based on the reception time stored in the synchronization control packet, the slave device. The shift of the SP time from the master device 5 is calculated to adjust the own SP time. The packet length of each packet in this communication network system may be fixed or variable. For example, IEEE802.3 and Ethernet
May be used.

FIG. 12 is a block diagram showing a configuration of slave devices 4a to 4d according to the fourth embodiment shown in FIG. Each of the slave devices 4a to 4d includes a sampling unit 41 that performs measurement in the SP cycle, a control unit 42 that controls each unit of the own device, and a transmission and reception unit 43 that transmits and receives packets to and from the outside. The control unit 42 controls the transmission / reception unit 43 at each SP time to transmit an SP information packet,
In addition, when there is a designation from the master device 5, it controls the transmission / reception unit 43 to transmit a synchronization control packet.

The control unit 42 is provided with a sampling unit 41
A calculating unit 44 for calculating a difference between the SP time for measurement at SP and the SP time held by the master device 5, and the calculating unit 4
Adjusting unit 45 that adjusts the SP time based on the calculation result of step 4
And a special code processing unit 46 that generates a special code and transmits the special code with priority, and adjusts the SP time when the special code and the synchronization control packet are returned.

FIG. 13 is a block diagram showing a configuration of master device 5 according to the fourth embodiment shown in FIG. The master device 5 includes a control unit 51 that controls each unit of the own device,
A transmitting and receiving unit 52 for transmitting and receiving packets to and from the outside;
It has. The control unit 51 includes the slave devices 4a to 4b
, An information processing unit 53 that processes SP information stored in an SP information packet received from a user, a timing management unit 54 that counts own SP time, and a synchronization control unit 55 that executes a synchronization procedure
And a special code processing unit 5 for transmitting a special code with priority
And 6. The synchronization control unit 55 executes the synchronization procedure by sequentially specifying the slave devices 4a to 4d.

FIG. 14 is a block diagram showing a configuration of the multiplexing devices 6a to 6e according to the fourth embodiment shown in FIG. Each of the multiplexing devices 6a to 6e includes a control unit 61 for controlling each unit of the own device, and a transmitting and receiving unit 62 for transmitting and receiving packets to and from the outside. The control unit 61 has a special code processing unit 63 that, when receiving a special code, transmits the packet with priority over other packets.

FIG. 15 is an explanatory diagram showing the structure of a synchronization control packet used in the synchronization procedure according to the fourth embodiment. The synchronization control packet of the fourth embodiment is different from the synchronization control packet of the first embodiment shown in FIG.
2 region to Tan region, Tb1 region, Tb2 region to Tbn
It has a configuration in which the region to the Tbn region are removed. The length of the synchronization control packet is independent of the number of multiplexed devices,
It is constant.

In the above configuration, the operation of the communication network system according to the fourth embodiment will be described.
In the operation of the communication network system, the master device 5 appoints one slave device, for example, 4a, from the slave devices 4a to 4d in order. As a method of the nomination, for example, a device management packet is used. The master device 5 and the designated slave device 4a execute a series of synchronization procedures for matching the SP times. The master device 5
After all the slave devices 4a to 4d are nominated and the above-described series of synchronization procedures are performed, the process returns to the first slave device again and repeats.

FIG. 16 is an explanatory diagram showing a synchronization procedure between the master device 5 and each of the slave devices 4a to 4d according to the fourth embodiment. In the figure, the master device 5 and the master device 5
9 shows an example of a synchronization procedure between the slave device 4d and the slave device 4d. Although this example shows a case where the SP cycle is longer than the transmission delay time, the same applies to a case where the SP cycle is shorter. Also, for the sake of simplicity, the master device 5
A multiplexing device between the slave device 4d and the multiplexing device 6
Although only a is used, the same applies to a case where the signal passes through a plurality of multiplexers.

In this synchronization procedure, first, the slave device 4d transmits a special code to the master device 5 in accordance with its own SP time (S31). At this time, even while the slave device 4d is transmitting another packet, the other packet being transmitted is divided and the special code is transmitted with priority. Thereafter, the slave device 4d transmits a synchronization control packet to the master device 5 (S3).
2). The time required from the own SP time to the transmission of the synchronization control packet may vary depending on the transmission status of another packet.

Upon receiving the special code from the slave device 4d, the multiplexing device 6a separates the packet if there is another packet being transmitted, and transfers the special code to the master device regardless of the relay of other packets. 5 is transmitted with priority (S33). When receiving the synchronization control packet from the slave device 4d, the multiplexer 6a relays the synchronization control packet to the master device 5 (S34). Note that the time required from the reception of the synchronization control packet to the transmission of the synchronization control packet may vary depending on the relay status of other packets.

When the master device 5 receives the special code via the multiplexing device 6a, the master device 5 measures and holds the time Ts required from the immediately preceding own SP time to the reception of the special code. When there is another packet being transmitted, the packet is divided, and the special code is added to the slave device 4 in accordance with the next own SP time regardless of the transmission of the other packet.
It is returned preferentially to d (S35). Master device 5
When the synchronization control packet is received, the held time Ts
Is stored in a predetermined area of the received synchronization control packet and returned to the slave device 4d (S36). In addition,
The time required for transmitting the synchronization control packet from the own SP time may vary depending on the transmission status of another packet.

When the multiplexing device 6a receives the special code again, regardless of the relaying of other packets, if there is another packet being transmitted, it divides the packet and relays it to the slave device 4d with priority. (S37). Multiplexer 6
Upon receiving the synchronization control packet again, a relays the packet to the slave device 4d (S38). Note that the time required from the reception of the synchronization control packet to the transmission of the synchronization control packet may vary depending on the relay status of other packets. Slave device 4d
Receives the special code via the relay device 6a, measures and retains the time Tm required from the immediately preceding own SP time to the reception of the special code. As is clear from FIG. 16, the equation (3) shown in the conventional example holds as it is. When the slave device 4d receives the synchronization control packet,
The SP time difference ΔT between the own apparatus and the master apparatus 5 is calculated from the equation (3), and the own SP time is corrected.

The special code has a meaning in its own existence and has no information element. Therefore, the special code is extremely short compared to the packet length, and is uniquely identified so that each device can extract it from the received packet stream. It can be (unique). For example, as a transmission code, IEEE Std
When the 4B / 5B code group defined by the 802.3u 100BASE-T standard is applied, the 5B code uses one of invalid codes such as "11001". Alternatively, as the data link layer, ISO7766
HDLC (High-level Data Link Control Procedure)
e) When the standard is applied, an invalid flag sequence such as seven consecutive “1” s is used.

As described above, according to the fourth embodiment,
In a large-scale communication network system in which one master device and a plurality of slave devices are connected by at least one multiplexing device, each device transmits a special code with priority over other packets. ) Can be calculated using the equation (3), and the SP times can be made to coincide with extremely high accuracy.

Embodiment 5 Embodiment 5 of the present invention
In Embodiment 1 described above, each device of the communication network system uses the transmission frame configured by a plurality of TSs (time slots) instead of
Information, synchronization control information and device management information are transmitted and received. The basic configuration and operation are the same as those of the first embodiment, and only different parts of the operation and the transmission frame will be described. FIG. 17 is an explanatory diagram illustrating a configuration of a transmission frame according to the fifth embodiment of the present invention. The transmission frame includes an area (frame header) for storing control information such as an identifier indicating the head of the transmission frame, and S
Area for storing P information or device management information (TS # 1 to TS # 1)
#N) and an area for storing synchronization control information (T for synchronization control)
S).

The synchronization control TS includes an SP number area for storing an SP number which is incremented by one for each SP cycle T, and delay times Ta1 and Ta2 in which synchronization control information is received from each device in the upstream.
Ta1 area, Ta2 area to Tan area to store Tan, a Ts area for the master device 2 to store the measured time Ts, and a delay time T that the synchronization control information receives from each device in the downlink.
It has a Tb1 area for storing b1, Tb2 to Tbn, and a Tb2 area to Tbn area. Ta1 area, Ta2
The area to the Tan area, the Tb1 area, and the Tb2 to Tbn areas are provided for the number of passes through the multiplexer. In this case, the synchronization control information includes the SP number stored in these areas, the measurement time Ts, and the delay times Ta1, Ta2 to Ta
n, Tb1, Tb2 to Tbn.

Each of the slave devices 1a to 1d generates SP information in accordance with the SP time synchronously controlled with each other, stores it in a TS assigned in advance, and transmits it to the master device 2. The master device 2 collects SP information from each of the slave devices 1a to 1d. Further, the master device 2 and each of the slave devices 1a to 1d store synchronization control information such as a delay time in the synchronization control TS and transmit and receive the same in order to make the respective SP times coincide with each other. The multiplexing devices 3a to 3e re-edit and relay all upstream transmission transmission frames into transmission transmission frames, broadcast relay downstream transmission transmission frames, and relay SP information and synchronization control information. In addition, all the devices transmit and receive the device management information stored in a pre-assigned TS.

Master device 2 and slave devices 1a to 1d
Similarly to the case of using a packet, the master device 2 appoints each of the slave devices 1a to 1d in a cyclic order, and the slave device designated as the master device 2 performs a series of operations for matching the SP time. Perform synchronization procedure.
This series of synchronization procedures will be described with reference to FIG. In this example, it is assumed that the slave device 1d is designated, and for simplicity of description, only the multiplexing device 3a is arranged between the master device 2 and the slave device 1d. The same applies to a case where there are a plurality of multiplexing devices passing through. In this synchronization procedure, first, the slave device 1d transmits synchronization control information to the master device 2 (S1). At this time, the delay time Ta1 that would be required from the immediately preceding own SP time until the synchronization control information is stored in a predetermined TS of the transmission frame and transmitted is measured (predicted).
Then, it is stored and transmitted in the Ta1 area of the synchronization control information.

When the multiplexing device 3a receives the synchronization control information from the slave device 1d, it relays the information to the master device 2. At this time, a delay time Ta2 required from transmission of the synchronization control information to transmission thereof is measured, stored in the Ta2 area of the synchronization control information, and transmitted (S2). Upon receiving the synchronization control information via the multiplexing device 3a, the master device 2 measures and holds the time Ts required from the immediately preceding own SP time to receiving the synchronization control information. The master device 2 returns the synchronization control information to the slave device 1d after the elapse of the next own SP time. At this time,
The delay time Tb1 that would be required from the own SP time to the transmission of the synchronization control information is measured (estimated), and the respective times Ta1, Ta2, originally stored in the received synchronization control information are calculated.
Further, the time Ts held at the time of reception and the measured (predicted) delay time Tb1 are stored in a predetermined area of the synchronization control information and transmitted.

When receiving the synchronization control information again, the multiplexing device 3a relays the information to the slave device 1d. At this time, a delay time Tb2, which is required from the reception of the synchronization control information to the transmission thereof, is measured (predicted), stored in a predetermined Tb2 area of the synchronization control information, and transmitted (S4). Upon receiving the synchronization control information via the multiplexing device 3a, the slave device 1d measures a time Tm required from the immediately preceding own SP time to receiving the synchronization control information. From the equation (11), the slave device 1d calculates the SP time difference ΔT between the two devices.
Is calculated, and the own SP time is corrected.

As described above, according to the fifth embodiment, ΔT can be calculated from equation (11) even when a transmission means using a transmission frame with a fixed period is used, and the same effect as in the first embodiment is obtained. Is obtained. Furthermore, since the transmission frame is used without using the packet, the destination device ID,
It is not necessary to provide control information such as a transmission source device ID for each TS, so that transmission efficiency can be improved.

Embodiment 6 FIG. Embodiment 6 of the present invention
In the above-described fifth embodiment, the multiplexer transmitting the synchronization control information does not store the delay time information in the synchronization control TS but adds it to the delay time information stored in the synchronization control TS. It is something to go. Note that the basic configuration and operation are the same as in Embodiment 5,
Only the operation relating to a series of synchronization procedures between the master device 2 and the slave device designated by the master device 2 and the format of the transmission frame are different from those of the fifth embodiment.
Only different parts will be described.

FIG. 18 is an explanatory diagram showing a configuration of a transmission frame according to the sixth embodiment. Note that the basic configuration is the same as that of the transmission frame of the fifth embodiment, and the description of the same portions will be omitted, and only different portions will be described. The transmission frame according to the sixth embodiment corresponds to the Ta1 area, the Ta2 area to the Ta of the transmission frame according to the fifth embodiment.
Instead of the n area, Tb1 area, Tb2 area to Tbn area, a Ta area in which the synchronization control information stores the total delay time Ta received from each device in the upstream, and a delay time in which the synchronization control information is received from each apparatus in the downstream T that stores the total value Tb of
b region. In this case, the synchronization control information is
It consists of SP numbers, measurement times Ts, and total values Ta and Tb stored in these areas. The length of the TS for synchronization control is constant irrespective of the number of multiplexing devices.

Next, an operation related to a series of synchronization procedures between the master device 2 and the slave device 1d designated by the master device 2 will be described with reference to FIG. In addition,
Delay time Ta1, Ta2 to Tan, Tb1, Tb2 to T
bn and times Ts and Tm are the same as those described in the fifth embodiment. In this synchronization procedure, first,
The slave device 1d transmits synchronization control information to the master device 2 in synchronization with the own SP time (S11). At this time,
The delay time Ta1 is measured (estimated), and the synchronization control information Ta is measured.
Store in the area and send.

Upon receiving the synchronization control information, the multiplexing device 3a relays the information to the master device 2. At this time, the delay time T
a2 is measured (predicted), the delay time Ta2 is added to the value stored in the Ta area of the synchronization control information, and the added value is overwritten in the Ta area and transmitted (S12). Master device 2
Receives the synchronization control information, measures and holds the time Ts, and returns the synchronization control information to the slave device 1d in synchronization with the next own SP time (S13). At this time, the delay time Tb1 is measured (predicted). Then, the measured delay time Tb1 is stored in the Tb area of the received synchronization control information, and the held time Ts is stored in the Ts area of the synchronization control information and returned.

When receiving the synchronization control information again, the multiplexer 3a relays the information to the slave device 1d. At this time, the delay time Tb2 is measured (predicted), the delay time Tb2 is added to the value stored in the Tb area of the synchronization control information, and the added value is overwritten in the Tb area and transmitted (S14). Upon receiving the synchronization control information, the slave device 1d receives the time Tm
Is calculated, and the shift ΔT of the SP time between the own apparatus and the master apparatus 2 is calculated from the above-described equation (12), and the own SP time is corrected.

As described above, according to the sixth embodiment, the same effect as that of the fifth embodiment can be obtained, and the length of the synchronization control information can be shortened, so that the transmission efficiency can be improved and the time Ta can be improved. , Tb are fixed, so that it is not necessary to assign a storage position to each device in advance, and device management can be simplified.

Embodiment 7 Embodiment 7 of the present invention is different from Embodiment 5 in that each device transmitting the synchronization control information does not store the information of the delay time in the synchronization control TS. The information of the delay time of the device and the information stored in the synchronization control information are calculated, and the information stored in the synchronization control TS is updated. Note that the basic configuration and operation are the same as those of the fifth embodiment, and only the operation relating to a series of synchronization procedures between the master device 2 and the slave device designated by the master device 2 and the format of the transmission frame are different. Since it is different from the fifth embodiment, only different parts will be described.

FIG. 19 is an explanatory diagram showing a configuration of a transmission frame according to the seventh embodiment. Note that the basic configuration is the same as that of the transmission frame of the fifth embodiment, and the description of the same portions will be omitted, and only different portions will be described. The transmission frame according to the seventh embodiment includes the Ta1 area, the Ta2 area to the Ta
Instead of the n area, Ts area, Tb1 area, Tb2 area to Tbn area, the synchronization control information is transmitted by the master device 2, the slave devices 1a to 1d, and the multiplexing devices 3a to 3e.
It has a Tc area for storing c. In this case, the synchronization control information is composed of the SP numbers stored in these areas and the operation result Tc. The length of the TS for synchronization control is constant irrespective of the number of multiplexing devices.

Next, an operation related to a series of synchronization procedures between the master device 2 and the slave device 1d designated by the master device 2 will be described with reference to FIG. Note that the delay times Ta1, Ta2 to Tan, Tb1, Tb2
To Tbn and times Ts and Tm are the same as those described in the fifth embodiment. In this synchronization procedure, first, the slave device 1d transmits synchronization control information to the master device 2 in synchronization with its own SP time (S21).
At this time, the delay time Ta1 is measured (predicted), stored in the Tc area of the synchronization control information, and transmitted.

When the multiplexing device 3a receives the synchronization control information, it relays the information to the master device 2. At this time, the delay time T
a2 is measured (predicted), the delay time Ta2 is added to the value stored in the Tc area of the synchronization control information, and the added value is overwritten in the Tc area and transmitted (S22). Master device 2
Receives the synchronization control information via the multiplexing device 3a, measures and holds the time Ts, and returns the synchronization control information to the slave device 1d in synchronization with the next own SP time (S23). At this time, the delay time Tb1 is measured (predicted). Then, the value Tc of the Tc area of the synchronization control information,
Formula (13) is calculated from the measured delay time Tb1 and the held time Ts to obtain a new value Tc, which is transmitted over the Tc area.

When receiving the synchronization control information again, the multiplexing device 3a relays the information to the slave device 1d. At this time, the delay time Tb2 is measured (predicted), the delay time Tb2 is added to the value stored in the Tc area of the synchronization control information, and the added value is overwritten in the Tc area and transmitted (S24). Upon receiving the synchronization control information, the slave device 1d measures the time Tm required from the immediately preceding own SP time to the reception of the synchronization control information, and calculates the time between the own device and the master device 2 according to the above-described equation (14). Is calculated, and the own SP time is corrected.

As described above, according to the seventh embodiment, the same effects as in the fifth and sixth embodiments are obtained, and the length of the synchronization control information is reduced, so that the transmission efficiency can be improved. Further, since the storage position of the time Tc is fixed, it is not necessary to assign the storage position to each device in advance, and the device management can be simplified.

Embodiment 8 FIG. Embodiment 8 of the present invention
In the above-described fourth embodiment, each device of the communication network system uses the transmission frame configured by a plurality of TSs (time slots) instead of the packet to transmit the SP.
Information, synchronization control information and device management information are transmitted and received. The basic configuration and operation are the same as those of the fourth embodiment, and only different parts of the operation and the transmission frame will be described. FIG. 20 is an explanatory diagram illustrating a configuration of a transmission frame according to the eighth embodiment of the present invention.

This transmission frame is synchronized with an area (frame header) for storing control information such as an identifier indicating the head of the transmission frame, and an area (TS # 1 to #N) for storing SP information or apparatus management information. And an area (synchronous control TS) for storing control information. Synchronous control TS
Has an SP number area for storing an SP number that increases by one for each SP cycle T, and a Ts area for the master device 5 to store the measured time Ts. The length of the synchronization control TS is constant irrespective of the number of multiplexing devices. The synchronization control information is composed of the SP number and the measurement time Ts.

Each of the slave devices 4a to 4d generates SP information in accordance with the SP time synchronously controlled with each other, stores it in a TS allocated in advance, and transmits it to the master device 5. The master device 5 collects and processes SP information from each of the slave devices 4a to 4d. Multiplexers 6a to 6e
Reedits and relays all uplink transmission frames into transmission transmission frames, broadcast-broadcasts downlink transmission frames, and relays SP information and synchronization control information. In addition, all the devices transmit and receive the device management information stored in a pre-assigned TS.

Master device 5 and slave devices 4a to 4d
Similarly to the case of using a packet, the master device 5 appoints each of the slave devices 4a to 4d in a circulating order, and the slave device designated as the master device 5 performs a series of operations to match the SP time. Perform synchronization procedure.
This series of synchronization procedures will be described with reference to FIG. In this example, it is assumed that the slave device 4d is designated, and for simplicity of description, it is assumed that only the multiplexing device 6a is disposed between the master device 5 and the slave device 4d.

In this synchronization procedure, first, the slave device 4d transmits a special code to the master device 5 in accordance with its own SP time (S31). At this time, even while the slave device 4d is transmitting a TS in which other information is stored or a vacant TS, the transmitting device divides the transmitting TS and gives priority to a special code having a unique bit pattern. Send. The special code may be the same as the special code of the fourth embodiment. Thereafter, the slave device 4d transmits the synchronization control information to the master device 5 (S32).

When receiving the special code from the slave device 4d, the multiplexing device 6a divides the TS being transmitted and gives priority to the transmission of the special code regardless of the relay of other information. The priority is transmitted to the master device 5 (S33). When receiving the synchronization control information from the slave device 4d, the multiplexer 6a relays the synchronization control information to the master device 5 (S3).
4). When receiving the special code via the multiplexing device 6a, the master device 5 measures and retains the time Ts required from the immediately preceding own SP time to the reception of the special code. Then, the TS being transmitted is divided, and regardless of the transmission of other information, the special code is preferentially returned to the slave device 4d in accordance with the next own SP time (S35).

When the master device 5 receives the synchronization control information, the master device 5 stores the held time Ts in a predetermined area of the received synchronization control information and returns it to the slave device 4d (S36). When receiving the special code again, the multiplexing device 6a divides the transmitting TS regardless of the relay of other information, and relays the TS to the slave device 4d with priority (S3).
7). Upon receiving the synchronization control information again, the multiplexing device 6a relays the information to the slave device 4d (S38). Upon receiving the special code via the relay device 6a, the slave device 4d measures and retains the time Tm required from the immediately preceding own SP time to the reception of the special code. As is clear from FIG. 16, the equation (3) shown in the conventional example holds as it is. Upon receiving the synchronization control information, the slave device 4d calculates the shift ΔT of the SP time between the slave device 4d and the master device 5 from equation (3), and corrects the own SP time.

As described above, according to the eighth embodiment, ΔT can be calculated from equation (3) even when a transmission means using a transmission frame with a fixed period is used. Is obtained. Furthermore, since a transmission frame is used without using a packet, there is no need to provide control information such as a destination device ID and a transmission source device ID for each TS, and transmission efficiency can be improved.

In Embodiments 1 to 8,
The case where the system is extended to a large-scale communication network system has been described. However, in a configuration in which one master device and one slave device are directly connected, a synchronization control packet (synchronization control information)
Even if transmission of other packets (information) such as the device management packet (device management information) conflicts with the irregular transmission of
Similar effects can be obtained. In the first to eighth embodiments, the master device and the multiplexing device are different devices. However, the same effect can be obtained even if the master device and the uppermost multiplexing device are shared and one device is used. can get.

Further, the function of the master device, that is, the function of executing the synchronization procedure for the slave device and the function of collecting and processing the SP information packet (SP information) from the slave device are separated, and the former is placed in the uppermost stage. And the latter may be provided in the master device, and a plurality of master device connection ports may be provided in the uppermost multiplex device. This allows more master devices to be connected,
Processing of the SP information packet (SP information) can be advanced.

In Embodiments 1 to 8,
Although the slave device transmitted the synchronization control packet (synchronization control information) or the special code, the master device should transmit the synchronization control packet (synchronization control information), calculate the sampling time difference on the master device side, and instruct the slave device to adjust the sampling time. You may make it. Also, an example has been described in which the measurement of the power system is performed at the synchronously controlled SP interval. However, the present invention may be applied to another system that operates at the synchronously controlled timing. Further, the delay time Ta1 may not be stored in the synchronization control packet (synchronization control information) but may be held in the slave device. Further, the stored time information may be a negative value. In this case, subtraction is performed instead of addition, and addition is performed instead of subtraction.

In the fourth and eighth embodiments,
Although the slave device has transmitted the special code and the synchronization control packet (synchronization control information) to the master device 5, only the special code may be transmitted. In this case, upon receiving the special code, the master device 5 returns the special code and the synchronization control packet (synchronization control information) to the slave device. Thereby, uplink transmission efficiency can be improved.

[0126]

As described above, according to the present invention, the calculating means calculates the timing of the slave device and the timing of the master device including the delay time in the slave device, the master device or the relay device in transmitting the synchronization control information. The adjustment means adjusts the timing of the slave device based on the calculation result of the calculation means. This makes it possible to adjust the timing in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device, thereby improving the synchronization accuracy of the periodic operation timing. To play.

According to the next invention, since the slave device, the master device, or the relay device that transmits the synchronization control information stores the delay time information in the own device in the synchronization control information, the transmission source device is returned. There is an effect that the information of the delay time can be obtained from the obtained synchronization control information.

According to the next invention, the slave device, the master device, or the relay device that transmits the synchronization control information updates the information stored in the synchronization control information based on the delay time in its own device. There is an effect that the device can obtain information based on the delay time from the returned synchronization control information.

According to the next invention, the slave device (master device) transmits the synchronization control information to the master device (slave device) via the relay device, and the master device (slave device) transmits the synchronization control information. The information of the time from the timing immediately before receiving to the reception and the information of the time from immediately before returning the synchronization control information to the returning of the synchronization control information,
Stored in the synchronization control information, returned to the slave device (master device) via the relay device, and stored in the received synchronization control information the information on the time from when the relay device received the synchronization control information until when it transmitted it. The calculation means converts the returned synchronization control information into information on the time from the timing immediately before the slave device (master device) receives it to the reception thereof and information on the time stored in the synchronization control information. Based on this, the difference between the timing of the slave device and the timing of the master device is calculated. This makes it possible to adjust the timing in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device, thereby improving the synchronization accuracy of the periodic operation timing. To play.

According to the next invention, the slave device (master device) stores, in the synchronization control information, information on the time from immediately before transmission of the synchronization control information to transmission thereof, and stores the information in the master via the relay device. The information is transmitted to the device (slave device) and the time from when the master device (slave device) receives the synchronization control information until it is received and the time from when the timing immediately before returning the synchronization control information is returned. Is stored in the synchronization control information and returned to the slave device (master device) via the relay device, and the relay device receives the synchronization control information and transmits the synchronization control information to the slave device (master device). The sum or difference from the time indicated in the information is calculated, the time information stored in the synchronization control information is updated and relayed, and the calculating means threads the returned synchronization control information. The deviation between the timing of the slave device and the timing of the master device is calculated based on the information on the time from the timing immediately before reception to the reception of the slave device (master device) to the reception and the time information stored in the synchronization control information. . This makes it possible to adjust the timing in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device, thereby improving the synchronization accuracy of the periodic operation timing. To play.

According to the next invention, the slave device (master device) stores, in the synchronization control information, information on the time from when the slave device immediately before transmitting the synchronization control information to when the slave device transmits the synchronization control information. The master device (slave device) receives the synchronization control information from the own device immediately before receiving the synchronization control information, and the time indicated in the synchronization control information; The operation from the timing of the own device immediately before returning the synchronization control information to the time until the return is performed, the information of the time stored in the synchronization control information is updated, and the slave device (master device) is transmitted via the relay device. The relay device calculates the sum or difference between the time from when the synchronization control information is received to when it is transmitted and the time indicated in the received synchronization control information, and stores the sum or difference in the synchronization control information. The time information is updated and relayed, and the calculation means stores the returned synchronization control information in the time information and the synchronization control information from the timing immediately before the slave device (master device) receives the received synchronization control information. The shift between the timing of the slave device and the timing of the master device is calculated based on the time information. This makes it possible to adjust the timing in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device, thereby improving the synchronization accuracy of the periodic operation timing. To play.

According to the next invention, the slave device, the master device, and the relay device transmit the special code of the unique bit pattern with priority over other information, and reciprocate between the slave device and the master device. Then, the master device or the slave device stores the information based on the arrival time of the special code in the synchronization control information and transmits it. This eliminates the need to consider the delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, and can perform appropriate timing adjustment, thereby improving the synchronization accuracy of the periodic operation timing. The effect is that it can be done.

[0133] According to the next invention, the adjusting means adjusts the difference between the timing of the master device calculated including the delay time in the own device, the master device or the relay device in transmitting the synchronization control information and the timing of the own device. , And adjusts the timing of the own device. This makes it possible to adjust the timing in consideration of the delay time in the transmission of the synchronization control information in the slave device, the master device, or the relay device, thereby improving the synchronization accuracy of the periodic operation timing. To play.

According to the next invention, a special code for synchronization control of a unique bit pattern is transmitted with priority over other information, so that a slave device, a master device, or a relay device in the transmission of synchronization control information. Therefore, it is not necessary to consider the delay time, and the appropriate timing adjustment can be performed, so that the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, by storing the information of the delay time in the transmission of the own device in the synchronization control information, the delay time in the slave device, the master device or the relay device in the transmission of the synchronization control information is also considered. Since the timing can be adjusted, there is an effect that the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, the information stored in the synchronization control information is updated based on the delay time in the transmission of the own device, so that the slave device, the master device, or the relay device in the transmission of the synchronization control information can update the information. Since the timing can be adjusted in consideration of the delay time, there is an effect that the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, a special code for synchronization control of a unique bit pattern is transmitted prior to other information, and information based on the reception time of the special code is stored in the synchronization control information and transmitted. By doing so, it is not necessary to consider the delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, so that an effect is obtained that appropriate timing adjustment can be performed.

According to the next invention, the delay time information in the relay of its own device is stored in the synchronization control information and relayed, whereby the slave device in the transmission of the synchronization control information,
Since the timing can be adjusted in consideration of the delay time in the master device or the relay device, the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, the information stored in the synchronization control information is updated and relayed based on the delay time in the relay of the own device, whereby the slave device, the master device or the relay device in the transmission of the synchronization control information is updated. Since the timing can be adjusted in consideration of the delay time in the device, the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, a special code having a unique bit pattern is transmitted with higher priority than other information, so that a delay time in a slave device, a master device or a relay device in transmission of synchronization control information can be reduced. Since there is no need to consider it and proper timing adjustment can be performed, there is an effect that the synchronization accuracy of the periodic operation timing can be improved.

According to the next invention, in the slave device (master device), a special code of a unique bit pattern is transmitted with priority over other information at the timing of the slave device (master device). The relay device transmits synchronization control information for use by the relay device, relays the special code transmitted from the slave device (master device) with priority over other information, and transmits the synchronization code transmitted from the slave device (master device). The master device (slave device) relays the control information, and holds information on the time from the timing of the master device (slave device) to the time immediately before receiving the special code relayed by the relay device in the master device (slave device). At the timing after receiving the relayed special code, it is returned with priority over other information, and the synchronization control information relayed by the relay device includes: Stores information of lifting time,
The relay device relays the special code returned from the master device (slave device) with higher priority than other information, relays the synchronization control information returned from the master device (slave device), The (master device) holds information on the time from the timing of the slave device immediately before receiving the special code relayed by the relay device to the reception of the special code, and stores the information of the time stored in the synchronization control information relayed by the relay device. The timing of the slave device is adjusted based on the information and the held time information. This eliminates the need to consider delay time in the slave device, the master device, or the relay device in transmitting the synchronization control information, and can perform appropriate timing adjustment.
There is an effect that the synchronization accuracy of the periodic operation timing can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a communication network system according to a first embodiment of the present invention;

FIG. 2 is a block diagram illustrating a configuration of a slave device according to the first embodiment illustrated in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a master device according to the first embodiment illustrated in FIG. 1;

FIG. 4 is a block diagram showing a configuration of the multiplexing apparatus according to the first embodiment shown in FIG.

FIG. 5 is an explanatory diagram illustrating a configuration of a synchronization control packet according to the first embodiment;

FIG. 6 is an explanatory diagram illustrating a synchronization procedure according to the first embodiment;

FIG. 7 is an explanatory diagram illustrating a configuration of a synchronization control packet according to the second embodiment of the present invention;

FIG. 8 is an explanatory diagram of a synchronization procedure according to the second embodiment;

FIG. 9 is an explanatory diagram illustrating a configuration of a synchronization control packet according to the third embodiment of the present invention;

FIG. 10 is an explanatory diagram of a synchronization procedure according to the third embodiment;

FIG. 11 is an explanatory diagram illustrating a configuration of a communication network system according to a fourth embodiment of the present invention;

FIG. 12 is a block diagram illustrating a configuration of a slave device according to a fourth embodiment illustrated in FIG. 11;

FIG. 13 is a block diagram showing a configuration of a master device according to a fourth embodiment shown in FIG.

FIG. 14 is a block diagram illustrating a configuration of a multiplexing apparatus according to a fourth embodiment illustrated in FIG. 11;

FIG. 15 is an explanatory diagram illustrating a configuration of a synchronization control packet according to the fourth embodiment;

FIG. 16 is an explanatory diagram illustrating a synchronization procedure according to the fourth embodiment;

FIG. 17 is an explanatory diagram showing a configuration of a transmission frame according to the fifth embodiment of the present invention.

FIG. 18 is an explanatory diagram showing a configuration of a transmission frame according to the sixth embodiment of the present invention.

FIG. 19 is an explanatory diagram showing a configuration of a transmission frame according to the seventh embodiment of the present invention.

FIG. 20 is an explanatory diagram showing a configuration of a transmission frame according to the eighth embodiment of the present invention.

FIG. 21 is an explanatory diagram showing a configuration of a conventional communication network system.

FIG. 22 is an explanatory diagram showing a conventional synchronization procedure.

[Explanation of symbols]

1a to 1d, 4a to 4d slave device, 2,5 master device, 3a to 3e, 6a to 6e multiplexer, 11,
41 sampling unit, 12, 21, 31, 42, 5
1,61 control unit, 13,22,32,43,52,6
2 transmission / reception unit, 14,44 calculation unit, 15,45 adjustment unit, 23,53 information processing unit, 24,54 timing management unit, 25,33,55 synchronization control unit, 46,56,6
3 Special code processing unit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 CC05 DD01 DD02 DD03 KK32 NN21 NN58 5K030 HA08 HB15 JA01 JA11 LA03 LA15 LD18 LE05 5K047 AA05 AA18 BB15

Claims (16)

[Claims] At least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, a relay device that relays information between the slave device and the master device, A communication network system that reciprocates synchronization control information for synchronization control between the slave device and the master device to synchronize the timing of the slave device with the timing of the master device. Calculating means for calculating a difference between the timing of the slave device and the timing of the master device including a delay time in the relay device, the slave device or the master device, and the slave based on a calculation result of the calculating device. Adjusting means for adjusting the timing of the device; and a communication network comprising: System. 2. The communication network according to claim 1, wherein the slave device, the master device, or the relay device that transmits the synchronization control information stores information on a delay time of the own device in the synchronization control information. system. 3. The slave device, the master device, or the relay device that transmits the synchronization control information updates information stored in the synchronization control information based on a delay time of the own device. A communication network system according to claim 1. 4. The slave device or the master device,
The synchronization control information is transmitted to the master device or the slave device via the relay device, and the master device or the slave device receives the synchronization control information from a timing immediately before receiving the synchronization control information to a time until the synchronization control information is received. Information and information of the time until transmission from the timing of its own device immediately before transmitting the synchronization control information,
The synchronization control information is stored and transmitted to the slave device or the master device via the relay device.The relay device receives the synchronization control information and transmits time information from the reception of the synchronization control information to the received synchronization information. The calculation unit stores the information on the time from when the slave device or the master device immediately receives the synchronization control information until the slave device or the master device receives the synchronization control information, and relays the synchronization control information. 2. The communication network system according to claim 1, wherein a difference between the timing of the slave device and the timing of the master device is calculated based on the time information stored in the information. 5. The slave device or the master device,
The information of the time from the timing of the own device immediately before transmitting the synchronization control information to the time of transmission is stored in the synchronization control information, and transmitted to the master device or the slave device via the relay device. Or, the slave device, the information of the time from the timing of the own device immediately before receiving the synchronization control information to the reception of the synchronization control information, and the information of the time from the timing of the own device immediately before transmitting the synchronization control information to the transmission of the synchronization control information ,
The synchronization control information is stored and transmitted to the slave device or the master device via the relay device.The relay device transmits the synchronization control information to a time period from reception to transmission and the received synchronization control information. The sum or difference from the indicated time is calculated and the time information stored in the synchronization control information is updated and relayed, and the calculating unit receives the synchronization control information by the slave device or the master device. A shift between the timing of the slave device and the timing of the master device is calculated based on information on the time from the timing of the immediately preceding slave device or master device to reception and the information on the time stored in the synchronization control information. 2. The method according to claim 1, wherein
A communication network system according to claim 1. 6. The slave device or the master device,
The information of the time from the timing of the own device immediately before transmitting the synchronization control information to the time of transmission is stored in the synchronization control information, and transmitted to the master device or the slave device via the relay device. Or, the slave device, the time from the timing of its own device immediately before receiving the synchronization control information to the reception, the time indicated in the synchronization control information, and the timing of its own device immediately before transmitting the synchronization control information From the time to transmission, and updates the time information stored in the synchronization control information, transmits to the slave device or the master device via the relay device, the relay device, The sum or difference between the time from when the synchronization control information is received to when it is transmitted and the time indicated in the received synchronization control information are calculated and stored in the synchronization control information. Relaying the updated time information, the calculating means, the slave device or the master device receives the synchronization control information immediately before the timing of the slave device or the master device until receiving the time information and the 2. The communication network system according to claim 1, wherein a difference between a timing of the slave device and a timing of the master device is calculated based on time information stored in synchronization control information. 7. At least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, and at least one relay device that relays information between the slave device and the master device. Equipment and
A communication network system that transmits synchronization control information for synchronization control to synchronize the timing of the slave device with the timing of a master device, wherein the slave device, the master device, and the relay device have unique bits. The special code of the pattern is transmitted with higher priority than other information, and reciprocates between the slave device and the master device. The master device or the slave device synchronizes information based on the arrival time of the special code. A communication network system, which is stored in control information and transmitted. 8. An operation of periodic timing is performed, and synchronization control information for synchronization control is reciprocated between a master device and a self device in a communication network system, and the timing of the master device and the timing of the self device are controlled. A slave device in a communication network system that synchronizes the timing of the master device, the timing of the master device calculated including the delay time of the master device, the relay device, or the own device in transmitting the synchronization control information, and the timing of the own device. A slave device in a communication network system, comprising: adjusting means for adjusting the timing of the own device based on the deviation. 9. A slave device in a communication network system for performing a periodic timing operation and synchronizing the timing of a master device with the timing of its own device, wherein a special code for synchronization control of a unique bit pattern is transmitted to another information device. A slave device in a communication network system, wherein transmission is performed with priority over transmission. 10. A timing for synchronization control is held, and synchronization control information for synchronization control is reciprocated between a slave device and a self-device in a communication network system, so that the timing of the slave device and the timing of the self-device are synchronized. A master device in a communication network system for synchronizing with the master device, wherein information on delay time in the self device is stored in the synchronization control information and transmitted. 11. Synchronization control timing is held, and synchronization control information for synchronization control is reciprocated between a slave device and a self-device in a communication network system. A master device in a communication network system that synchronizes the information stored in the synchronization control information based on a delay time of the master device. 12. A communication network system that holds synchronization control timing, transmits synchronization control information for synchronization control to a slave device in a communication network system, and synchronizes the timing of the slave device with the timing of its own device. Transmitting a special code for synchronization control of a unique bit pattern in preference to other information, storing information based on the reception time of the special code in the synchronization control information, and transmitting the information. A master device in a communication network system. 13. A relay device in a communication network system for relaying synchronization control information for synchronization control between a slave device and a master device in a communication network system, wherein information on a delay time of the own device is included in the synchronization control information. A relay device in a communication network system for storing and relaying. 14. A relay device in a communication network system for relaying synchronization control information for synchronization control between a slave device and a master device in a communication network system, wherein the relay control device transmits the synchronization control information based on a delay time in its own device. A relay device in a communication network system for updating and relaying stored information. 15. A relay device in a communication network system for relaying information between a slave device and a master device in the communication network system, wherein a special code for synchronization control of a unique bit pattern is prioritized over other information. A relay device in a communication network system, wherein the relay device transmits the data. 16. At least one slave device that performs a periodic timing operation, a master device that holds synchronization control timing, and at least one relay device that relays information between the slave device and the master device. Device, and a synchronization control method in a communication network system comprising: wherein, in the slave device or the master device, a special code of a unique bit pattern is given priority over other information at the timing of the slave device or the master device. A first transmission step of transmitting; a second transmission step of transmitting synchronization control information for synchronization control after the first transmission step in the slave device or the master device; A first relay step of relaying the special code transmitted in the transmission step with higher priority than other information; In the relay device, and a second relay step of relaying the synchronization control information transmitted in the second transmitting step, in said master device or a slave device, the first
A first holding step of holding time information from the timing of the master device or the slave device immediately before receiving the special code relayed in the relay process of the master device or the slave device; 1
A first return step of returning at a timing of the master device or the slave device after receiving the special code relayed in the relay process in preference to other information, 2
The information of the time held in the first holding step is stored in the synchronization control information relayed in the relay step of
A third relay step of relaying the special code returned in the first return step in preference to other information in the relay apparatus; and a second return step in the relay apparatus. A fourth relay step of relaying the synchronization control information returned in the step,
A second holding step of holding time information from the timing of the slave device or the master device immediately before receiving the special code relayed in the relaying step of the second relaying step, and a step of relaying the information in the fourth relaying step. An adjustment step of adjusting the timing of the slave device based on the time information stored in the synchronization control information and the time information held in the second holding step. Synchronous control method.