JP5676023B2 - Remote monitoring control system - Google Patents

Description

  The present invention relates to a remote monitoring and control system using a cyclic transmission system.

There is a remote monitoring and control system that detects a state change (hereinafter, state change) of a device installed in an electric power system and transmits / receives the state change information to a host device such as a computer. When the state change detection time is included in this state change information, for example, when the state change detection time includes year, month, day, hour, minute, and second, the amount of data is 6 bytes. The size of information increases by 6 bytes.

In the case of a system using Ethernet (registered trademark) as an information transmission medium as a transmission / reception method, high-speed communication is possible. Even if the amount of transmission information increases by adding time information to the state change information, the effect on the communication time Is small. However, when the cyclic transmission method shown in Non-Patent Document 1 is used, the communication speed and the communication efficiency are inferior to those using Ethernet (registered trademark), so the increase in the amount of transmission information has a great influence on the communication time. .

Published by Electric Joint Research Association, “Electrical Joint Research”, Vol. 31, No. 6, January 13, 1976, p. 10-P. 11

As described above, in the remote monitoring control system using the conventional cyclic transmission, the size of the state change information greatly affects the communication time. For this reason, transmission including the state change detection time in the state change information has not been performed so far, and for the same reason, time adjustment is not performed between the transmitting and receiving apparatuses.

An object of the embodiment of the present invention is to provide a remote monitoring and control system capable of transmitting a state change detection time or setting a time between transmitting and receiving apparatuses when a cyclic transmission method is used.

A remote monitoring control system according to an embodiment of the present invention is a remote monitoring control system including an information transmitting device that transmits information by a cyclic transmission method and an information receiving device that receives the information. Transmission information storage unit for storing information to be transmitted, first internal time , transmission from time when status change information and status change notification are input based on status change notification until status change information is transmitted A transmission information creation processing unit that creates information representing a waiting time, creates information including the state change information and information representing the transmission waiting time, and stores the information in the transmission information storage unit; and the first internal time And a transmission processing unit that transmits information stored in the transmission information storage unit to the information reception device, the information reception device transmitted from the transmission processing unit to a second internal time Information When the information type determination processing unit that determines whether or not the change information is included and the information type determination processing unit determines that the information transmitted from the transmission processing unit includes the state change information And a time calculation processing unit that calculates a time when the state change notification is input to the information transmission device based on information indicating a transmission waiting time .

According to the present invention, it is possible to obtain a remote monitoring control system capable of transmitting the state change detection time or setting the time between transmitting and receiving apparatuses even when the cyclic transmission method is used.

The figure which shows the structure of 1st Embodiment in the remote monitoring control system which concerns on this invention. (A) The figure which shows the transmission frame which the information transmitter of 1st Embodiment in the remote monitoring control system which concerns on this invention transmits. (B) The figure which shows the head bit sequence of the transmission frame which the information transmitter of 1st Embodiment in the remote monitoring control system which concerns on this invention transmits. The figure which shows the time change of the count value of the received information amount counter of 1st Embodiment in the remote monitoring control system which concerns on this invention. The flowchart showing the processing content of the time correction process 24 of 1st Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the structure of 2nd Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the time change of the count value of the reception information amount counter of 2nd Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the structure of 3rd Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the transmission waiting time of 3rd Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the transmission frame which the information transmitter of 3rd Embodiment transmits in the remote monitoring control system which concerns on this invention. The figure which shows the structure of 4th Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the structure of 5th Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the structure of 6th Embodiment in the remote monitoring control system which concerns on this invention. The figure which shows the structure which connected the information transmission / reception apparatus of 6th Embodiment in the remote monitoring control system which concerns on this invention.

  An embodiment of a remote monitoring control system according to the present invention will be described with reference to the drawings.

(First embodiment)
The configuration of the first embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the remote monitoring control system of this embodiment. The remote monitoring control system according to the present embodiment includes an information transmission device 1 that transmits state change information of a device installed in a power system, an information reception device 2 that receives state change information, an information transmission device 1, and an information reception device. 2
It is comprised from the information transmission medium 3 which mediates transmission / reception.

The information transmission apparatus 1 includes a transmission processing unit 11, a transmission information storage unit 12, a transmission timer 13, an internal clock 1
4 is provided. The transmission processing unit 11 transmits a transmission frame. Transmission information storage unit 1
2 stores a transmission frame. The transmission timer 13 outputs an information transmission command C11 indicating the transmission timing of the transmission frame to the transmission processing unit 11. Internal clock 14
Outputs absolute time.

The information receiving apparatus 2 includes a reception processing unit 21, a reception information amount counter 22, an internal clock 23, and a time correction processing unit 24. The reception processing unit 21 receives a transmission frame transmitted from the information transmission device 1. The reception information amount counter 22 counts the number of received transmission frames. The internal clock 23 outputs an absolute time. The time correction processing unit 24 keeps the time difference between the absolute times of the internal clocks 13 and 23 constant.

The operation of the present embodiment configured as described above will be described with reference to FIGS. FIG. 2 is a diagram showing a transmission frame transmitted by the information transmitting apparatus of the first embodiment in the remote monitoring control system according to the present invention. FIG. 3 is a diagram showing the change over time of the count value of the reception information amount counter of the first embodiment in the remote monitoring control system according to the present invention. FIG.
It is a flowchart showing the processing content of the time correction process 24 of 1st Embodiment in the remote monitoring control system which concerns on this invention.

First, the operation of the information transmitting apparatus 1 will be described. The transmission timer 13 outputs an information transmission command C11 to the transmission processing unit 11 at regular intervals based on the absolute time obtained from the internal clock 14.
Upon receiving the information transmission command C11, the transmission processing unit 11 acquires a transmission frame from the transmission information storage unit 12, and transmits the acquired transmission frame to the reception processing unit 21 of the information reception device 2 via the information transmission medium 3. To do.

A transmission frame transmitted from the transmission processing unit 11 of the information transmission device 1 to the reception processing unit 21 of the information reception device 2 is shown in FIG. The transmission frame 31 is composed of a head bit string 32 representing the head of the frame and a state change information bit string 33 representing state change information, and is transmitted at regular intervals at a transmission period T interval.

In the transmission frame 31 here, the state change detection time indicating the time when the state change is detected is not included in the state change information, and information on the state change detection time is not transmitted. Further, the transmission frame 31 includes measurement information indicating the state of the connected device, state change information indicating the state change of the device, control information indicating an operation command to the device, and the like. Further, in FIG. 2A, the non-transmission time T _n is shown between the transmission frames 31 transmitted at regular intervals, but the non-transmission time T _n may not be present.

Next, the operation of the information receiving device 2 will be described. The reception processing unit 21 outputs the received 1 bit to the reception information amount counter 22 every time 1 bit of the transmission frame 31 is received. The reception information amount counter 22 holds a count value, and counts up the count value according to a certain rule in response to reception of bit information from the reception processing unit 21.

An example of this fixed rule will be described with reference to FIG. When the reception information amount counter 22 detects a change from “1” to “0” in the last “1, 0” of the “1, 0” in the first bit string 32, the count value is set. It is counting up. That is, when the reception processing unit 21 receives the bit 37 immediately before the change and outputs it to the reception information amount counter 22 and then receives the bit 38 immediately after the change and outputs it to the reception information amount counter 22, the reception information amount counter 22 counts up the count value. Note that if this constant rule is a rule that always counts up at a certain fixed position of the leading bit string 32 (for example, bit information received after a predetermined number of bits counted from the leading bit 36), this embodiment is implemented. Adaptable to form.

FIG. 3 shows the time change of the count value of the reception information amount counter 22 when N = 12. N is the maximum count value of the reception information amount counter 22. As described above, the reception information amount counter 22 counts up the count value based on the bit information, and when the count value reaches the maximum count value N = 12, the reception information amount counter 22 A correction command C12 is transmitted and the count value is reset to zero.

FIG. 4 is a flowchart showing the operation of the time correction process 24 that has received the time correction command C12.
Will be described. The time correction processing unit 24 determines whether or not the time correction command C12 is received in the time correction command determination step S11. If it is determined that the time correction command C12 is received (Yes in S11), the time correction processing unit 24 performs internal processing in the internal time acquisition step S12. get the absolute time from the clock 23, internally holds it as the acquisition time t _a.

Then, at t _b decision step S13, the time correction processing unit 24 is determined whether the absolute time within the holding time t _b of the acquisition time t _a are separately internal retention is substituted.

No first when performing _{t b} determination step S13 in (S13, such as when you put the device power
) Is the t _b is determined that the absolute time has not been assigned, the process proceeds to t _a substitution step S16, substitutes the acquisition time t _a to the internal holding time t _b. If it is determined that the absolute time to t _b is substituted (Yes in S13), the process proceeds to the correction value calculation step S14, the correction value is calculated δ using the equation (1). Here, N is the maximum count value, T is the transmission period of the transmission frame,
t _a indicates an acquisition time, and t _b indicates an internal holding time.

δ = T · N− (t _a −t _b ) (1) Further, in the correction value addition step S15, the absolute time of the internal clock 23 is calculated based on the correction value δ calculated in the correction value calculation step S14. to correct. Thereafter, _{t a} substituted proceeds to step S16, after adding T · N inside the holding time tb, the time correction command determination step S11 again
Migrate to

According to the present embodiment, the information transmission device 1 does not transmit the state change detection time information to the information reception device 2, and the time difference between the absolute times of the internal clocks 14 and 23 of both devices is kept constant, Time can be adjusted.

Note that the transmission cycle T of the information transmission command C11 used for calculating the correction value δ in the present embodiment is information held as a fixed value by the information reception device 2, and the transmission cycle T for actually transmitting a transmission frame. 'May not exactly match. When T ′ fluctuates over time, the effect appears in the difference between the absolute time of the internal clock 14 and the absolute time of the internal clock 23. If the time average of T ′ is the same value as T, the maximum count By increasing the number N, it is possible to reduce the influence of time variation of T ′, and the time correction accuracy is further improved.

(Second Embodiment)
The configuration of the second embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and description is abbreviate | omitted. The configuration of this embodiment is different from that of the first embodiment in that a plurality of reception information amount counters 22-1, 22-2,... 22-n are provided in the information reception device 2. Received information counter 22-
1, 22-2,..., 22-n are set so that the initial count value is different.
In the present embodiment, by providing a plurality of reception information amount counters 22, it is possible to increase the frequency of time adjustment without reducing the maximum count value N that affects the time variation of T ′.

The operation of the present embodiment configured as described above will be described. The operation until the reception processing unit 21 of the information receiving device 2 receives the transmission frame transmitted from the information processing unit 11 of the information transmitting device 1 is the same as that of the first embodiment. For this reason, description of the operation of the information transmitting apparatus 1 is omitted.

Hereinafter, the operation of the information receiving apparatus 2 will be described. Each time the reception processing unit 21 receives 1-bit bit information of the transmission frame 31, the reception information amount counters 22-1, 22-2,.
The received 1-bit bit information is simultaneously output to each of -n. The operations of the reception information amount counters 22-1, 22-2,..., 22-n are the same as the operation of the reception information amount counter 22 of the first embodiment. Here, the maximum count value N is determined to be a value divisible by the number n of received information amount counters. Each reception information amount counter 22-1, 22-2, ..., 22-n
Are the same (N = 12).

The initial values of the reception information amount counters 22-1, 22-2,..., 22-n are different from each other, the initial value of the reception information amount counter 22-1 is 0, and the reception information amount counter 22-2 The initial value is set to N / n, ..., and the initial value of the reception information amount counter 22-n is set to (n-1) N / n. An example of the count values of the reception information amount counters 22-1, 22-2,..., 22-n is shown in FIG. FIG. 6 shows a case where the number of reception information amount counters (the number of installed reception information amount counters) is 3 (n = 3) and the maximum count value is N = 12. The initial value of the reception information amount counter 22-1 is set to 0, the initial value of the reception information amount counter 22-2 is set to 4, and the initial value of the reception information amount counter 22-n is set to 8. Each reception information amount counter 22-1 and 22-2
22-3, the time correction processing unit 24 when the count value reaches the maximum count value N = 12.
To output a time correction command C12.

The operation of the time correction processing unit 24 is different from the first embodiment in that the correction value δ is calculated using the equation (2) in the correction value calculation step S14 shown in FIG. Here, N maximum count value, T is the transmission cycle of the transmission frame, t _a is the acquisition time, t _b is the internal hold time, n is the number of the received information amount counter.

δ = T · N / n− (t _a −t _b ) (2) Formula According to the present embodiment, in addition to the effect of the first embodiment, by providing a plurality of reception information amount counters 22, Maximum count value N affecting the time variation of the actual transmission cycle T ′ described above
The frequency of time adjustment can be increased without reducing the value of.

That is, when a single reception information amount counter 22 is provided, it is necessary to reduce the maximum count value N in order to increase the frequency of time adjustment. However, if the maximum count value N is decreased, the influence of the actual transmission cycle T ′ on the transmission cycle T of the information transmission command C11 increases.

Therefore, by providing a plurality of reception information amount counters 22, the frequency of time adjustment can be increased without reducing the maximum count value N.

(Third embodiment)
The configuration of the third embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. This embodiment is different from the first embodiment in that a transmission information creation processing unit 15 is added in the information transmission apparatus 1 and a state change notification 35 is input, and a reception information amount counter in the information reception apparatus 2. 22. Instead of the time correction processing unit 24, a reception information storage unit 25, a time calculation processing unit 26, and an information type determination processing unit 27 are provided.

The operation of the present embodiment configured as described above will be described. First, the operation of the information transmitting apparatus 1 will be described. The operations of the transmission processing unit 11 and the transmission timer 13 are the same as those in the first embodiment.

The transmission timer 13 outputs an information transmission command C11 to the transmission processing unit 11 at regular intervals based on the absolute time obtained from the internal clock 14. When receiving the information transmission command C11, the transmission processing unit 11 acquires a transmission frame including the state change information from the transmission information storage unit 12, and transmits the acquired transmission frame to the reception processing unit 21 of the information reception device 2. obtains the absolute time from the internal clock 14 and internal retention as information transmission command reception time t _1.

On the other hand, when receiving the state change notification 35 including the state change information, the transmission information creation processing unit 15 acquires the absolute time from the internal clock 14 and internally stores it as the state change detection time t _2. Based on the detection time t ₂ and the information transmission command reception time t ₁ held in the transmission processing unit 11 (
3) The transmission waiting time _tw is calculated using the equation. This transmission waiting time _tw will be described with reference to FIG.

In FIG. 8, t ₁ is an information transmission command reception time, t ₂ is a state change detection time, n _F is the number of transmission frames waiting for transmission stored in the transmission information storage unit 12 (here, n _F = 2), T Indicates the transmission period of the transmission frame.

After calculating the _{t w = T · n F +} T + t 1 -t 2 ··· (3) Equation transmission waiting time _{t w,} the transmission information creation processing section 15 creates a variable information like including the transmission waiting time _{t w.} Thereafter, the transmission information creation processing unit 15 further creates a transmission frame 31 including the created state change information and stores it in the transmission information storage unit 12. Transmission processing unit 11, a transmission frame 31 including information of the transmission waiting time t _w stored in transmission information storage section 12, was awaiting transmission by the state change detection time stored in the transmission information storage section 12 n _F 3 transmission frames
Send 1 after sending.

  Next, the operation of the information receiving device 2 will be described.

(Calculation of the reception time _{t r)}
First, the reception processing unit 21, holds the transmission frame 31 transmitted from the transmission processing unit 11 each time one receives, calculates a first bit reception time t _r, the first bit reception time t _r which is the calculated internal At the same time, the transmission frame 31 is output to the information type determination processing 27. The leading bit reception time _tr is the time when the leading bit 36 in the leading bit string 32 of the transmission frame 31 is received.

Here, an example of how the reception processing unit 21 calculates the first bit reception time tr will be described below. The reception processing unit 21 receives the transmission frame 31 output from the transmission processing unit 11. When receiving the transmission frame 31, the reception processing unit 21 receives the bit 38 immediately after the change (the last “1, 0” bit in the first bit string 32 representing the beginning of the transmission frame 31 shown in FIG. 9). The absolute time is acquired from the internal clock 23 when a change from “1” to “0” is detected. Then, the information type determination process 27, the acquired absolute time and the first bit information change detection time t _1, on the basis of the first bit information change detection time t _1, the reception time t _r with (4) calculate.

Here, n _h is the number of bits of the up-bit sequence of "1" of the last "0" from the first bit 36 in the first bit string 32 of the transmission frame 31 (i.e., from the first bit 36 until immediately before the change bit 37 The number of bits), u is the information transmission rate [bit / s] between the information transmitting apparatus 1 and the information receiving apparatus 2, and _thr is the time required to detect the change from “1” to “0” and the internal clock. 23 shows the overhead time that is the sum of the time required to obtain the absolute time from 23.

_{t r = t 1 -n h /} u-t hr ··· (4) formulas (calculation of state change detection time _{t 2} ')
Next, the operation of calculating the variable detection time t _{2 'shape} on the basis of the transmission waiting time t _w contained in the state change information of the transmission frame 31 transmitted from the information transmitting apparatus 1 will be described.

When receiving the transmission frame 31 output from the reception processing unit 21, the information type determination processing unit 27 determines whether or not state change information is included in the transmission frame 31. Information type determination processing unit 27, when the state change information is included, the transmission waiting time t _w from the transmission frame 31, the reception processing section 2
Gets the reception time _{t r} from 1, and outputs the acquired _{t w} and _{t r} the time calculation processing unit 26. Here, the timing for acquiring the transmission waiting time tw may be different from the timing for calculating the reception time tr described above.

Time calculation processing unit 26 receives the transmission waiting time _{t w,} and the transmission waiting time _{t w,} (
4) Based on the first bit reception time t _r obtained by equation (5) form with the formula variable detection time t
₂ 'is calculated.

_{t 2 '= t r -t w} ··· (5) expression and, time calculation processing unit 26 calculates the state change detection time _{t 2'} information type determination processing section 2
7 is output. The report type determination processing unit 27 stores the state change information and the state change detection time t ₂ ′ included in the transmission frame 31 as a set in the reception information storage unit 25. The state change detection time t ₂ ′ is the same time as the state change detection time t ₂ acquired by the transmission information creation processing unit 15 of the information transmitting apparatus 1.

(Correction by transmission delay time _{t d)}
In the above description it does not take into account the transmission delay time t _d between the information transmitting apparatus 1 and the information receiving apparatus 2, but it is possible to calculate the transmission waiting time t _w in view of the transmission delay time t _d is there.

In this case, transmission information creation processing section 15 of the information transmitting apparatus 1 calculates the transmission waiting time t _w using equation (6). Here, n _F is the number of transmission frames awaiting transmission stored in the transmission information storage section 12, T is transmission period, t ₁ is the information transmission command reception time transmission processing unit 11 is held in the transmission frame , T ₂ is a state change detection time, and t _d is a transmission delay time between the information transmitting apparatus 1 and the information receiving apparatus 2.

t _w = T · n _F + T + t ₁ −t ₂ + t _d (6) On the other hand, the information reception apparatus 2 can also correct the transmission delay time t _d .

In this case, the time calculation processing unit 26 of the information receiving device 2 uses the equation (7) to detect the state change detection time t _2.
'Is calculated. Here, t _r is the first bit received time, t _w is transmission waiting time included in the state change information of the transmission frame 31, t _d is the transmission delay time between the data transmitting apparatus 1 and the information receiving apparatus 2.

t ₂ ′ = t _r −t _w −t _d (7) As described above, in this embodiment, the transmission waiting time _tw is transmitted from the information transmitting apparatus 1 to the information receiving apparatus 2, and information is transmitted. and to calculate the variable detection time t _{2 'shape} on the basis of the transmission waiting time t _w in the receiving apparatus 2.

Thus, from the information transmitting apparatus 1 to the information receiving apparatus 2, the state change detection time by sending a transmission wait time t _w of less information than the acquired state change detection time in the information transmitting apparatus 1 t
₂ can be obtained in the information receiving device 2 because the state change detection time t ₂ ′ at the same time as 2 can be obtained.
The state change detection time can be notified with a small amount of information.

(Fourth embodiment)
The configuration of the fourth embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 3rd Embodiment, and description is abbreviate | omitted. The configuration of this embodiment is different from that of the third embodiment in that a time change processing unit 28 is added to the information receiving device 2.

The operation of the present embodiment configured as described above will be described. Since the operations of the transmission processing unit 11, the transmission information storage unit 12, and the transmission timer 13 are the same as those in the third embodiment, description thereof is omitted.

First, the operation of the information transmitting apparatus 1 will be described. The transmission information creation processing unit 15 includes the information receiving device 2
Absolute When the time information is determined to be necessary to transmit, to calculate a transmission start time t _s which absolute time information begins to be transmitted to the information receiving apparatus 2 at (8) to. Here, the information receiving device 2
When the absolute time of the internal clock 14 has reached a preset time, or when the transmission information creation processing unit 15 sends the absolute time t, the number of transmission frames waiting for transmission n _F , unsent bits It may be when the reception command to receive a number n _b is input from the external input unit (not shown).

Further, T is a transmission frame transmission cycle, n _F is the number of transmission frames awaiting transmission stored in the transmission information storage section 12, t ₁ is the information transmission command receiving time.

_{t s = T · n F +} T + t 1 ··· (8) Equation further transmission information creation processing section 15, after calculating the transmission start time _{t s,} the transmission start time _{t s}
Is generated and stored in the transmission information storage unit 12.

At this time, absolute time information indicating a transmission start time t _s can be divided into a plurality of transmission frames.

Transmission frame when the transmission frame 31 including the absolute time information indicating a transmission start time t _s is stored in the created transmission information storage section 12 by the transmission information creation processing section 15, the transmission processing unit 11, which includes the absolute time information All the n _F transmission frames waiting to be transmitted at the time when 31 is created are transmitted to the reception processing unit 21 of the information receiving apparatus 2, and then the transmission frame 31 including the absolute time information is received by the information receiving apparatus 2 To the unit 21.

Next, the operation of the information receiving device 2 will be described. The reception processing unit 21 includes a transmission information creation processing unit 15
Each time one transmission frame 31 transmitted from is received, information included in the received transmission frame is extracted, and the information is output to the information type determination processing unit 27. Moreover, to calculate the first bit reception time t _r at the time of receiving the first bit 36 of the first bit string 32 of a transmission frame 31, it holds. This calculation method is the same as in the third embodiment.

Information type determination processing unit 27 receives the information extracted by the reception processing unit 21 determines whether it contains the absolute time information indicating a transmission start time t _s the transmission frame 31 received this. If there are absolute time information indicating a transmission start time t _s, the information type determination processing unit 27 acquires the transmission start time t _s from the transmission frame 31, the first bit held in the reception processing unit 21 Gets the reception time t _r, and outputs a transmission start time t _s and the first bit reception time t _r were those obtained time calculation processing unit 26.

If the absolute time information indicating a transmission start time t _s is transmitted divided into a plurality of transmission frames 31, all transmission frames including absolute time information indicating a transmission start time t _s at the reception processing section 21 31 after receiving the obtains the first leading bit reception time t _r of the received transmission frame in the plurality of transmission frames 31 received by the information type determination processing unit 27, the transmission start time from a plurality of transmission frames 31 get the t _s, and outputs the obtained the first bit reception time t _r transmission start time t _s to the time calculation processing unit 26.

Time calculation processing unit 26 receives the transmission start time t _s and the first bit reception time t _r, (
9) The correction value δ _c of the internal clock 23 is calculated based on the equation (9), and the correction value δ _c is output to the time change processing unit 28.

Upon receiving the correction value [delta] _c from _{δ c = t s -t r ···} (9) formula time calculation processing unit 26, the time change processing unit 28, an internal clock 2
3 of absolute time, is corrected based on the correction value [delta] _c. In other words, the time change processing unit 28, the absolute time of the internal clock 23 is corrected to a value obtained by adding the correction value [delta] _c.

Thus, according to this embodiment, the information receiving apparatus 2 from the information transmitting apparatus 1, by transmitting the transmission start time t _s, an absolute in the information receiving apparatus 2 of the information receiving apparatus 2 of the internal clock 23 The time can be set to the absolute time of the internal clock 14 of the information transmitting apparatus 1.

In the present embodiment, the transmission time of the transmission frame 31 (hereinafter referred to as a fixed time).
) May be set in advance, and when the fixed time comes, the fixed time information indicating the fixed time may be included in the transmission frame together with the transmission waiting time information, and the transmission frame may be transmitted.

That is, in the information transmitting apparatus 1, the transmission timer 13 outputs the information transmission command C11 when the absolute time of the internal clock 14 reaches a fixed time (for example, 0 o'clock), and the transmission processing unit 11 transmits this information transmission command. In accordance with the output of C11, a transmission frame including fixed time information and transmission waiting time information is transmitted. On the other hand, in the information receiving device 2, the reception processing unit 21 receives the transmission frame including the fixed time information and the transmission waiting time information transmitted from the transmission processing unit 11, and the information type determination processing unit for the received transmission frame When the time calculation processing unit 26 determines that the time information is included at 27, the time calculation processing unit 26 may calculate a correction value.

(Fifth embodiment)
The configuration of the fifth embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 4th Embodiment, and description is abbreviate | omitted. The configuration of this embodiment is different from that of the fourth embodiment in that the transmission information creation processing unit 1 of the information transmission device 1
5 is that a state change notification 35 is input.

The operation of the present embodiment configured as described above will be described. Since the operations of the transmission processing unit 11, the transmission information storage unit 12, and the transmission timer 13 are the same as those in the fourth embodiment, description thereof will be omitted.

First, regarding the operation of the information transmitting apparatus 1, the transmission information creation processing unit 15 creates a transmission frame for notifying the state change detection time (hereinafter referred to as a state change transmission frame), and a transmission frame ( Hereinafter, the description will be divided into the case of creating a time transmission frame.

(When creating a status change transmission frame)
When the state change notification 35 is input, the transmission information creation processing unit 15 performs transmission processing when the number of transmission frames n _F waiting for transmission stored in the transmission information storage unit 12 and the state change notification 35 are input. The number of bits of the portion not yet transmitted in the transmission frame being transmitted from the unit 11 to the reception processing unit 21 (hereinafter referred to as the number of untransmitted bits) _nb is acquired.

Upon acquisition of unsent bits n _b of the transmission information creation processing section 15, if the non-transmission time T _n exists, the transmission processing unit 11 is the number of bits that can be transmitted to the non-transmission time T _n (hereinafter, referred transmittable bits. ) and the number of bits of a transmission frame (hereinafter, the number of bits combined with) that the transmission frame number of bits determined as unsent bits n _b, and outputs the unsent bits n _b obtained in the transmission information creation processing section 15 ing. Transmission information creation processing section 15, the transmission frame number n _F, acquires the untransmitted bit number n _b, create a variable transmission frame shape including a the transmission frame number n _F and unsent bits n _b, transmission information Store in the storage unit 12.

(When creating a time transmission frame)
When the transmission information creation processing unit 15 determines whether or not it is necessary to transmit the absolute time information to the information receiving device 2, the transmission information creation processing unit 15 acquires the absolute time t of the internal clock 14 at the time of the determination and transmits the transmission information storage unit 12. and a transmission frame number n _F awaiting transmission stored, the unsent bits n _b of the transmission processing unit 11 obtains the. Here, when it is necessary to transmit to the information receiving device 2, the absolute time of the internal clock 14 comes at a preset time, or the transmission information creation processing unit 15 sends the absolute time t, a transmission frame waiting for transmission. the number n _F, may be when the reception command to receive a number of unsent bits n _b is input from the external input unit (not shown).

Then, the transmission information creation processing unit 15 creates a time transmission frame including the absolute time information indicating the absolute time t, the transmission frame number n _F, and the number of untransmitted bits _nb, and the transmission information storage unit 12
To store. The absolute time information may be divided into a plurality of time transmission frames and stored in the transmission information storage unit 12.

When creating the state-change transmission frame and the time transmission frame described above, when the transmission information creation processing unit 15 creates the transmission frame 31 and stores it in the transmission information storage unit 12, the transmission processing unit 11 All the n _F transmission frames waiting for transmission at the time of creation are transmitted to the reception processing unit 21 of the information receiving device 2, and then the transmission frame 31 is transmitted to the reception processing unit 21 of the information receiving device 2.

  Next, the operation of the information receiving device 2 will be described.

Each time the reception processing unit 21 receives 1-bit bit information of the transmission frame 31 transmitted from the transmission processing unit 11, the reception processing unit 21 outputs the received bit information to the information type determination processing unit 27. Further, the reception processing unit 21 calculates a first bit reception time t _r is the time when receiving the first bit 36 of the first bit string 32 of a transmission frame, holds. The method of calculating the first bit reception time t _r is the same as the third embodiment.

The operation of the information type determination processing unit 27 will be described separately for the case where the transmission frame received by the reception processing unit 21 is a deformed transmission frame and the case of a time transmission frame.

(When a status change transmission frame is received)
The information type determination processing unit 27 receives 1-bit bit information output from the reception processing unit 21. As a result, when the bit information for one transmission frame 31 is received, the received transmission frame It is determined whether 31 is a status change transmission frame or a time transmission frame. Information type determination processing unit 27, when the transmission frame 31 received is determined to be state change transmission frame, the transmission frame number n _F of the transmission frame _31, acquires the number of unsent bits n _b,
It gets the first bit reception time t _r of the transmission frame 31 from the reception processing unit 21, and outputs the number of transmission frames and these acquired n _F and the unsent bits n _b and the reception time t _r to the time calculation process 26. The time calculation process 26 includes a transmission frame number n _F , an untransmitted bit number n _b , and a reception time _tr.
Is received based on the expression (10), and the state change detection time t _c ′ is calculated and output to the information type determination processing unit 27. Here, T is the transmission period of the transmission frame, and u is the transmission rate between the information transmitting apparatus 1 and the information receiving apparatus 2.

t _c ′ = _tr −n _F · T−n _b / u (10) Expression When the information type determination processing unit 27 receives the state change detection time t _c ′ from the time calculation processing unit 26, the state change is performed. The information and the state change detection time t _c ′ are stored in the reception information storage unit 25. State change detection time t _c ′
Is the time when the state change notification 35 is input to the transmission information creation processing unit 15 of the information transmitting apparatus 1, that is,
It is the same time as the state change detection time when the state change is detected in the transmission information creation processing unit 15 of the information transmitting apparatus 1.

(When a time transmission frame is received)
On the other hand, the information type determination processing unit 27 transmits the transmission frame 3 received by the reception information processing unit 21.
When 1 is determined to be a time transmission frame, the absolute time t,
Transmission frame number n _F, extracts the number of unsent bits n _b, and obtains the first bit reception time t _r of the first bit sequence 32 of the transmission frame 31 from the reception processing unit 21, the transmission frame and the obtained absolute time t and outputs the number n _F and unsent bits n _b and the first bit reception time t _r to the time calculation processing unit 26.

When the absolute time information of the absolute time t of the internal clock 14 is divided into a plurality of transmission frames 31, all the transmission frames 31 including the absolute time information of the absolute time t of the internal clock 14 are received by the reception processing unit 21. after receiving the, along with information type determination processing unit 27 obtains the first leading bit reception time t _r of the received transmission frame in the plurality of transmission frames 31 received,
The absolute time t of the internal clock 14, the number of transmission frames n _F , and the number of untransmitted bits _nb are acquired from the plurality of transmission frames 31, and the acquired start bit reception time _tr and the absolute time t of the internal clock 14 are acquired.
And the transmission frame number n _F and the untransmitted bit number n _b are output to the time calculation processing unit 26. Time calculation processing unit 26, an absolute time t, the transmission frame number n _F, the number of unsent bits n _b, when receiving the first bit reception time t _r, calculates a time correction value t'based on equation (11), The time correction value t ′ is output to the time change processing unit 28. Here, T is the transmission period of the transmission frame, and u is the transmission rate between the information transmitting apparatus 1 and the information receiving apparatus 2.

t ′ = t + n _F · T + n _b / u− _tr (11) When the time correction value t ′ is received from the time calculation processing unit 26, the time change processing unit 28 uses the absolute time of the internal clock 23 as the time correction value. Correction is performed based on t ′. That is, the time change processing unit 28
The absolute time of the internal clock 23 is corrected to a value obtained by adding the time correction value t ′.

According to the present embodiment, the transmission information creation processing unit 15 of the information transmission device 1 creates a transmission frame including the absolute time information of the absolute time t of the internal clock 14 or the state change information, and the information reception device 2
The information type determination processing unit 27 determines whether the received transmission frame includes absolute time information or state change information, so that the time of the internal clock 14 of the information transmission device 1 and the time of the internal clock 23 of the information reception device 2 are determined. And the state change detection time can be notified.

In addition, the transmission processing unit 11 of the information transmitting apparatus 1 includes the number of transmission frames n _F and the number of untransmitted bits n _b
Since the transmission frame 31 including the information is transmitted to the reception processing unit 21 of the information receiving apparatus 2,
When the information transmission speed of the information transmitting apparatus 1 and the information receiving apparatus 2 is increased, the time resolution per unit information is improved.

(Sixth embodiment)
The configuration of the sixth embodiment of the remote monitoring control system according to the present invention will be described with reference to FIG. FIG. 12 shows the configuration of the information transmitting / receiving apparatus 4 of the remote monitoring control system in the present invention. The configuration of the information transmitting / receiving device 4 of the sixth embodiment is a configuration in which the information transmitting device 1 and the information receiving device 2 of the second and fifth embodiments are integrated, and therefore the same configuration is the same. The description is omitted.

Next, the operation of this embodiment will be described. Information transmission and time correction in the cyclic transmission method are performed by the transmission processing unit 11, the transmission information storage unit 12, the transmission timer 13, the internal time 14, the reception processing unit 21, the reception information amount counter 22, and the time correction processing unit 24. The method is the same as in the second embodiment.

Transmission / reception of the state change detection time and the absolute time information is performed by the transmission processing unit 11, the transmission information storage unit 12, the transmission timer 13, the internal time 14, the transmission information creation processing unit 15, the reception processing unit 21, and the reception information 25.
The time calculation processing unit 26, the information type determination processing unit 27, and the time change processing unit 28 perform the same method as in the fifth embodiment.

FIG. 13 shows a plurality of information transmitting / receiving apparatuses 4-1,...
,..., 7-3, 8-1,... Upon receiving the state change notification 35-1,... 35-3, each slave station device 6-1,..., 6-3 creates state change information including information indicating the state change detection time. The master station device 5 transmits absolute time information to each slave station device to adjust the time.

According to this embodiment, the information transmitting / receiving device 4 is integrated with the information transmitting device 1 and the information receiving device 2.
By doing so, it is possible to configure a remote monitoring control system that performs uplink / downlink communication as shown in FIG.

Further, the time adjustment for keeping the difference between the time of the information transmitting device 1 and the time of the information receiving device 2 as in the second embodiment constant, and the absolute time of the information transmitting device 1 as in the fifth embodiment By having both functions of time adjustment as the time of the information reception device 2, once the time adjustment of the fifth embodiment is performed, the information transmission device can be simply performed by time adjustment of the second embodiment. 1 and the internal time of the information receiving apparatus 2 can be matched.

DESCRIPTION OF SYMBOLS 1 ... Information transmission apparatus 2 ... Information reception apparatus 3 ... Information transmission medium 4 ... Information transmission / reception apparatus 5 ... Master station apparatus 6 ... Slave station apparatus 7 ... Downlink information transmission medium 8 ... Uplink information transmission medium 11 ... Transmission processing part 12 ... Transmission Information storage unit 13 ... transmission timer 14, 23 ... internal clock 15 ... transmission information creation processing unit 16 ... state change notification 21 ... reception processing unit 22 ... reception information amount counter 24 ... time correction processing unit 25 ... reception information storage unit 26 ... Time calculation processing unit 27 ... Information type determination processing unit 28 ... Time change processing unit 31 ... Transmission frame 32 ... First bit string 33 ... State change information bit string 35 ... State change notification 36 ... First bit 37 ... Immediately before change bit 38 ... Immediately after change bit C11 ... Information transmission command C12 ... Time correction command

Claims (5)

In a remote monitoring control system comprising an information transmitting device that transmits information by a cyclic transmission method and an information receiving device that receives the information,
The information transmitting device includes:
A transmission information storage unit for storing information to be transmitted;
A first internal time;
Based on the state change notification, the state change information and the information indicating the transmission waiting time until the state change information is transmitted from the time when the state change notification is input are created, and the state change information and the transmission wait time are A transmission information creation processing unit that creates information including information to be expressed and stores the information in the transmission information storage unit;
A transmission processing unit that transmits information stored in the transmission information storage unit to the information receiving device based on the first internal time;
The information receiving device includes:
A second internal time;
An information type determination processing unit for determining whether or not the state change information is included in the information transmitted from the transmission processing unit;
When the information type determination processing unit determines that the status change information is included in the information transmitted from the transmission processing unit, the status change is made to the information transmission device based on information indicating a transmission waiting time. A remote monitoring control system comprising: a time calculation processing unit that calculates a time when a notification is input. The information receiving apparatus includes a time change processing unit,
The transmission information creation processing unit creates time information based on a time acquired from a first internal time, and information indicating a transmission waiting time until the time information is transmitted from the acquired time. generates information including the information representative of the information and the transmission waiting time, is stored in the transmission information storage憶部,
The information type determination processing unit determines whether or not time information is included in the information transmitted from the transmission processing unit;
When the information type determination processing unit determines that the time information is included in the information transmitted from the transmission processing unit, the time calculation processing unit is based on information indicating a transmission waiting time. Calculating the time acquired from the first internal time by the transmitting device;
The remote monitoring control system according to claim 1, wherein the time change processing unit corrects the second internal time based on the time calculated by the time calculation processing unit.   The remote monitoring control system according to claim 1 or 2, wherein the information indicating the transmission waiting time is an amount of information stored in the transmission information storage unit. The time calculation processing unit, wherein when calculating the time from the time information or the state change information, to claim 2, characterized in that for correcting the transmission delay time between the information transmitting apparatus and the information receiving apparatus Remote monitoring control system. The transmission information creation processing unit adds information indicating a transmission delay time between the information transmission device and the information reception device to the transmission information when creating the time information or the state change information. The remote monitoring control system according to claim 2 .

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