JPH10163986A - Intra-device supervisory and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid decline of the throughput of the entire system in the case that an abnormal response is generated and to reduce the traffic of a serial bus. SOLUTION: At the time of requesting the gathering of alarms from a supervisory and control part 101 to supervisory and control object parts 201-205, plural responses are requested by a single multi-cast packet and a response packet to be transmitted from the supervisory and control object parts 201-205 to the supervisory and control part 101 is transmitted as a variable length packet for which reduced information which is the information of only the presence/ absence of the alarm and the detail information of the alarm are combined. Thus, the traffic of the serial bus 10 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-apparatus supervisory control system for monitoring information of a plurality of supervisory control units via a serial bus.

[0002]

2. Description of the Related Art In a conventional in-device monitoring and control system, for example, as shown in Japanese Patent Application Laid-Open No. 3-195224, a higher-order monitoring controller is individually assigned to a lower-level monitoring control target unit. By sending a request and obtaining a one-to-one response to the request, the state of the monitoring control target unit has been monitored.

FIG. 10 is a block diagram without showing the above-described conventional monitoring and controlling method in a device, FIG. 11 is a block diagram of a serial bus terminating unit 1211 in FIG. 10, and FIG. FIG. 13 is a diagram showing a data structure of a request packet in the control system, and FIG. 13 is a diagram showing a data structure of a response packet in the conventional in-device monitoring control system of FIG.

[0004] This conventional in-device monitoring and control system includes a monitoring and control unit 1101 and serial bus terminating units 111 and 1211.
1215 and monitoring control target units 1201 to 1205.

The monitoring control unit 1101 transmits an alarm collection request packet for requesting the collection of alarms, which are information on various states in its own device, collected by a monitoring control target unit at a certain period. , And transmits a serial bus monitoring request packet for monitoring the normal operation of the serial bus 10 at a constant serial bus monitoring cycle.

[0006] The serial bus terminating unit 1111 transmits the request packet transmitted from the monitoring control unit 1101 to the serial bus 10 and the serial bus terminating unit 1211.
1215, and transmits the response packet addressed to the monitoring control unit 1101 to the monitoring control unit 1101.

[0007] Serial bus terminators 1211 to 1215
Are connected to the serial bus 10, and are respectively connected to the monitoring / control target units 1201 to 1205 by the internal bus 20.
When the request packet output from the serial bus terminating unit 1111 is received via the serial bus 10 and the received request packet is a request packet addressed to the monitoring control target unit connected to the serial bus terminating unit, The request packet is transmitted to the monitoring control target unit. Then, response packets output from the monitoring control target units 1201 to 1205 are input via the internal bus 20 and transmitted to the serial bus 10.

[0008] The monitoring control target units 1201 to 1205 collect and hold alarms, which are information on various states in their own devices, at a constant monitoring period in the device, and are transmitted via the internal bus 20. When the request packet is an alarm collection request packet, the held alarm is output to the internal bus 20 as a response packet, and when the request packet transmitted via the internal bus 20 is a serial bus monitoring request packet,
A packet corresponding to the request indicated by the serial bus monitoring request packet is assembled and used as a response packet.
Output to 0.

FIG. 11 is a block diagram of the serial bus terminating unit 1211 in FIG.

The serial bus terminating unit 1211 includes a reception control unit 1233, a reception circuit 1231, and an ID detection circuit 1231.
32, a reception buffer 1234, and a transmission buffer 124
2, a transmission control unit 1243, and a transmission circuit 1241.

The reception control unit 1233 controls the reception circuit 1231 to take in the request packet output to the serial bus 10 according to the instruction of the monitoring control target unit 1201 transmitted via the internal bus 20.

The receiving circuit 1231 includes a receiving control unit 1233
And outputs the request packet output to the serial bus 10 to the ID detection circuit 1232.

The ID detection circuit 1232 includes a reception circuit 123
If the ID of the transmission destination included in the request packet output from No. 1 matches the ID of the connected monitoring / control target unit, the received request packet is stored in the reception buffer 1234.
Output to

The reception buffer 1234 includes the ID detection circuit 1
The request packet output from the H.232 is stored, and the stored request packet is output to the in-device bus 20 according to the instruction of the monitoring control target unit transmitted via the device bus 20.

The transmission buffer 1242 stores the response packet output from the monitoring control target unit 1201 in the internal bus 20.
Input and store via.

When receiving a response packet transmission instruction from the monitoring / control target unit 1201 via the internal bus 20, the transmission control unit 1243 transmits the response packet stored in the transmission buffer 1242 to the transmission circuit 1241. Control to output to

The transmission circuit 1241 includes a transmission control unit 1243
And outputs the response packet stored in the transmission buffer 1242 to the serial bus 10.

The serial bus terminating units 1111, 1211-121
Reference numeral 1215 denotes the same configuration and operation as those of the serial bus terminating unit 1211, and a description thereof will be omitted.

Next, FIG. 12 shows the data structure of a request packet output by the monitoring control unit 1101.

The request packet is composed of a header 13 indicating the request.
01, transmission destination ID 1302, and transmission source ID 130
3 and the content 1304 of the request.

A header portion 1301 indicating a request indicates that the packet is a request packet.

The transmission destination ID 1302 indicates the ID of the transmission destination to which the request packet is to be transmitted. In the conventional in-device monitoring and control system shown in FIG.
1201 indicates one of them.

The transmission source ID 1303 indicates the ID of the device that has transmitted the request packet, and indicates the ID of the monitoring control unit 1101 in the conventional in-device monitoring control system of FIG.

The request content 1304 stores the type of the request packet and the request content from the transmission source to the transmission destination.

The request packet includes a serial bus monitoring request packet for monitoring the normal operation of the serial bus 10 and an alarm collection for collecting various alarms held by the monitoring control target units 1201 to 1205. There are request packets.

Next, the monitoring control target units 1201 to 1205
FIG. 13 shows the data structure of a response packet transmitted from the to the monitoring control target unit 1101.

The response packet is composed of a header 13 indicating a response.
11, the transmission destination ID 1312, and the transmission source ID 131
3 and a response content 1314.

The header section 1311 indicating a response indicates that the packet is a response packet.

The transmission destination ID 1312 indicates the ID of the transmission destination to which the response packet is to be transmitted, and in the conventional in-device monitoring and control system shown in FIG.
Is shown.

The transmission source ID 1313 indicates the ID of the device that has transmitted the response packet. In the conventional in-device monitoring control system shown in FIG.
One of the following.

The response content 1314 stores the response content corresponding to the request content 1304 of the received request packet as data. In the case of a response to an alarm collection request, information of all alarms is assembled and stored in a response content 1314 using a simple bitmap.

Next, the operation of the conventional in-device supervisory control system will be described with reference to the drawings.

FIG. 14 is a diagram showing a communication process of the conventional in-device monitoring control method of FIG. 10, FIG. 15 is a flowchart showing a process of the monitoring control unit 1101 in FIG. 10, and FIG. 16 is a monitoring control object in FIG. 6 is a flowchart illustrating processing of units 1201 to 1205.

The monitoring control unit 1101 and the monitoring control target unit 12
There is an upper and lower relationship in control between 01 and 1205,
The monitoring control unit 1101 is located at a higher level, and the monitoring control target units 1201 to
1205 is regarded as the lower order, and the information is transmitted by the lower order responding to the request from the upper order. Request and response are 1
FIG. 14 shows this communication processing method.

In FIG. 14, when the monitoring control unit 1101 transmits a request to the monitoring control target unit 1201, the monitoring control target unit 1201 that has received the request outputs a response to the received request to the monitoring control unit 1101. When the monitoring of one monitoring control target unit is completed, the monitoring control unit 1101 sequentially outputs requests. By repeating this operation, all the monitoring control target units 1201 to 1205 are monitored.

The operation including the abnormal processing of the above-described conventional in-device monitoring control method will be described with reference to FIGS.

First, the operation of the monitoring controller 1101 will be described with reference to FIG.

The monitoring control unit 1101 manages time, and when the time of the serial bus monitoring cycle has come (step 1501), all the monitoring control units 1201 to 12 are controlled.
05 is to be collected (step 1511), and a serial bus monitoring request packet is assembled (step 151).
2).

Then, since the request has not been transmitted to any collection target yet (step 1531), one of the monitoring control target units 1201 to 1205 to be collected is selected and a request packet is transmitted (step 1531). 1532). When the response packet is received, the content 131 of the response is received.
4 is checked (step 1533), and the content 13 of the response is checked.
14 is normal (step 1534), the content of the response 1
314 (step 1541), and the response content 13
If 14 is abnormal or if a certain time has elapsed and time-out has occurred (step 1534), and if the number of retransmissions does not exceed the set number of times (step 1535), a retransmission request is transmitted to the monitoring control target unit to be collected. Then, if the number of retransmissions exceeds the set number of times (step 1535), the monitoring control unit to be collected is regarded as abnormal (step 1551). The ID of the next collection target among the monitoring control target units 1201 to 1205
Is set (step 1561), and the same operation is continued, but all the monitoring / control target units 1201 to 120 to be collected are set.
Upon completion of the collection for No. 5, the process returns to the initial state (step 1531).

When the time of the alarm collection cycle has come (step 1502), if the alarm collection cycle differs depending on the collection target, the collection target to which the request packet should be output at the current alarm collection cycle time, for example, monitoring control The target units 201 to 203 are extracted (step 1502),
Assembling the alarm collection request packet (step 152)
2). Thereafter, the same processing method as that for transmitting the serial bus monitoring request packet, checking the response, and storing the content of the response is performed, and the process returns to the initial state.

Then, other processing is performed until the next serial bus monitoring cycle or alarm collection cycle (step 1503).

Next, the serial bus terminating units 1211 to 121
5 and the operation of the monitoring control target units 1201 to 1205 will be described with reference to FIG.

Serial bus terminators 1211 to 1215
Indicates that the ID 1302 of the transmission destination of the received request packet is the ID of the monitoring control target unit connected to the serial bus terminal unit.
If it is D (step 1601), it is determined whether it is a retransmission request, and if it is a retransmission request (step 161).
1) Transmit the information stored in the transmission buffer 1242 (step 1621). If the received request packet is an alarm collection request packet (step 1612), a response packet to the received alarm collection request packet is assembled based on the alarm held at that time (step 1631). If the received request packet is a serial bus monitoring request packet (step 1613), a response packet to the serial bus monitoring request packet is assembled (step 1641). The response packet assembled in step 1631 or step 1641 is copied to the transmission buffer 1242 (step 1614),
The data is transmitted to the serial bus 10 (step 1615).

Destination ID 13 of the received request packet
02 does not match the corresponding ID (step 160
1) At the time of the internal monitoring cycle (step 160)
2) In-device monitoring is performed (step 1603), and the alarm as a result of in-device monitoring is stored until the next alarm collection request is made.

Until a request packet in which the transmission destination ID 1302 matches the corresponding ID is received, or until the internal monitoring period is reached (step 1602), other processing is performed (step 1604).

[0046]

However, the above-mentioned conventional in-device monitoring and control system has the following problems. (1) If a response to a specific request cannot be obtained because the request and response are controlled in pairs, the timeout and retransmission are repeated, so that the next request cannot be transmitted and the process proceeds. , The processing capacity of the entire system is reduced. (2) Since various alarms are transmitted in a simple bitmap, the traffic on the serial bus always increases even when there is no alarm.

An object of the present invention is to provide an in-apparatus supervisory control method capable of avoiding a reduction in the processing capacity of the entire system when an abnormal response occurs and reducing the serial bus traffic.

[0048]

In order to achieve the above object, an in-device monitoring and control method according to the present invention checks a collection request of an alarm held by a monitoring control target unit and a normal operation of a serial bus. A monitoring control unit that outputs a request packet for transmitting a request to be performed to the monitoring control target unit at a fixed cycle, and transmits a request packet transmitted from the monitoring control unit to a serial bus, Receiving a response packet transmitted to the monitoring control unit via the serial bus from another device connected to the serial bus,
A first serial bus terminating unit for transmitting to the monitoring control unit, connected to the serial bus, and connected one-to-one with the plurality of monitoring control target units via an internal device bus, respectively;
The request packet output from the first serial bus terminating unit is received via the serial bus, and if the received request packet is a request packet transmitted to the connected monitoring control target unit, the request packet is A plurality of second serial bus terminating units for transmitting the response packet output from the monitoring control target unit via the internal bus and transmitting the response packet to the serial bus, Alarms in various states in the apparatus are collected and held, and when the request packet transmitted via the internal bus is a request packet requesting collection of alarms, the held alarm is used as a response packet as the response packet. In the in-apparatus supervisory control system configured to include a plurality of supervisory control target units that output to an internal bus, the request packet includes a plurality of grouped supervisory control units. Against your target portion, characterized in that it is a multicast packet can request a response at a time.

According to an embodiment of the present invention, each of the monitoring control target units has a receiving circuit so as to take in the multicast packet output to the serial bus in accordance with the instruction of the monitoring control target unit transmitted via the internal bus. A receiving control unit for controlling, a receiving circuit controlled by the receiving control unit, receiving the multicast packet output to the serial bus, and outputting the received multicast, included in the multicast packet output from the receiving circuit; An ID detection circuit that outputs an input multicast packet when the ID of the group of the transmission destination that matches the ID of the group to which the connected monitoring control target unit belongs;
The use state of the serial bus is detected through the reception circuit, a collision prevention circuit that outputs the result, and a multicast packet output from the ID detection circuit are stored, and the multicast packet transmitted through the device bus is stored. A reception buffer that outputs a multicast packet stored in accordance with an instruction of a monitoring control target unit to the internal bus, and a transmission buffer that inputs and stores a response packet output from the monitoring control target unit via the internal bus, When a transmission instruction of a response packet is received from the monitoring and control target unit via the internal bus, the use state of the serial bus is confirmed by the output of the collision prevention circuit. To control the transmission of the response packet, and after the transmission of the response packet, the state of the serial bus. Checking again, when detecting that the serial bus is in a collision state in which a plurality of transmitted packets collide, a transmission control unit that controls the transmission circuit to retransmit the response packet after an arbitrary time. And a transmission circuit which is controlled by the transmission control unit and outputs a response packet stored in the transmission buffer to the serial bus.

According to the present invention, a plurality of responses are requested by a single multicast packet when a request for collection of an alarm is sent from the monitoring control unit to the monitoring control target unit.

Therefore, traffic on the serial bus can be reduced.

According to another embodiment of the present invention, in the in-apparatus supervisory control system, the multicast packet has information indicating the result of the previous alarm collection, and When the packet is received, if the information indicates that the result of the previous alarm collection is normal, only the alarm to be transmitted this time is transmitted by a response packet, and the information indicates that the result of the previous alarm collection is abnormal. In this case, the logical sum of the previously transmitted alarm and the alarm to be transmitted this time is calculated, and the calculation result is transmitted as a response packet.

According to the present invention, the result of the previous alarm collection is added to the multicast packet transmitted from the monitoring control unit to the monitoring control target unit. Therefore, if the response packet for alarm collection transmitted from the monitoring control target unit is not transmitted to the monitoring control unit for some reason, the monitoring control target unit determines the result of the previous alarm collection from the next transmitted multicast packet. Can be recognized as not being transmitted to the monitoring control unit, and the logical sum of the previously transmitted alarm and the alarm to be transmitted this time is calculated, and the result is transmitted as a response packet. .

Therefore, the monitoring control unit does not repeat the operation of waiting for the reception of the response packet but transmitting the response packet retransmission request because the response packet cannot be received due to the timeout, and it is possible to prevent the alarm from being missed.

According to another embodiment of the present invention, in the in-apparatus supervisory control system, each of the supervisory control target units comprises:
When transmitting the alarm by a response packet, degenerate information that is only information of the presence or absence of the alarm, and detailed information of the alarm when there is an alarm is transmitted by a response packet, the monitoring control unit, When a response packet is received, only the alarm indicated by the degeneration information is performed. According to the present invention, when transmitting a response packet from the monitoring control target unit to the monitoring control unit, the response packet is transmitted as a variable-length packet combining degenerate information, which is information indicating only the presence or absence of an alarm, and detailed information of the alarm. It was made.

Therefore, when the monitoring / control target unit is not in the normal state of issuing an alarm, only the degeneration information is transmitted by the response packet, so that the serial bus traffic can be reduced.

[0057]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing an in-apparatus supervisory control system according to a first embodiment of the present invention.
FIG. 5 is a block diagram of the serial bus terminating unit 211 in FIG. 1, FIG. 5 is a diagram showing communication processing of the in-device monitoring control method of FIG. 1, and FIG. 3 is a data structure of a multicast packet in the in-device monitoring control method of FIG. FIG. 4 is a diagram showing a data structure of a response packet in the in-device monitoring control system of FIG.

The monitoring and control method in the apparatus according to the present embodiment includes a monitoring control unit 101 and serial bus terminating units 11 and 211 to 2.
15 and the monitoring control target units 201 to 205.

The in-device supervisory control system of the present invention has a supervisory control unit 101 as a higher-level device for control and supervisory control target units 201 to 205 as lower-level devices for control, each of which is a serial bus termination unit. 111, 211 to 215.

The monitoring control unit 101 monitors a request for collection of an alarm, which is information on various states in its own device, collected by a monitoring control target unit at a certain period, and a normal operation of the serial bus 10. Is transmitted at a certain period.

The serial bus terminating unit 111 transmits the multicast packet transmitted from the monitoring control unit 101 to the serial bus 10 and the serial bus terminating unit 2
The response packet transmitted from 11 to 215 addressed to the monitoring control unit 101 is received and transmitted to the monitoring control unit 101.

The serial bus terminating units 211 to 215 are connected to the serial bus 10, respectively, are connected one-to-one with the monitoring / control target units 201 to 205 by the internal bus 20, and output the multicast output from the serial bus terminating unit 111. If the received multicast packet is a multicast packet addressed to the group to which the monitoring control target unit connected to the serial bus terminating unit belongs, the received multicast packet is transmitted to the monitoring control target unit. I do. Then, response packets output from the monitoring control target units 201 to 205 are input via the internal bus 20 and transmitted to the serial bus 10.

The monitoring control target units 201 to 205 collect and hold alarms, which are information on various states in their own devices, in a device monitoring cycle that is a fixed period, and
If the result of the previous alarm collection in the multicast packet transmitted through the device is normal, the stored alarm is output to the internal bus 20 as a response packet, and the multicast packet transmitted through the internal bus 20 is output. If the result of the previous alarm collection is abnormal, the logical sum of the previously transmitted alarm and the held alarm is calculated, and the result is output to the internal bus 20.

In the present embodiment, the monitoring control target units 201 to 201
205 is divided into group 1 and group 2, and alarms are collected for each of them. Group 1 includes monitoring control target unit 20
1, 202, and 203 belong to the group 2, and the monitoring control units 204 and 205 belong to the group 2.

FIG. 2 shows the serial bus termination unit 211 in FIG.
It is a block diagram of.

The serial bus terminating unit 211 includes a reception control unit 233, a reception circuit 231, an ID detection circuit 232,
A collision prevention circuit 235, a reception buffer 234,
It comprises a transmission buffer 242, a transmission control section 243, and a transmission circuit 241.

The reception control unit 233 controls the reception circuit 231 so as to take in the multicast packet output to the serial bus 10 in accordance with the instruction of the monitoring control target unit 201 transmitted via the internal bus 20.

The reception circuit 231 is controlled by the reception control section 233 and outputs the multicast packet output to the serial bus 10 to the ID detection circuit 232.

The ID detection circuit 232 determines that the multicast destination group ID included in the multicast packet output from the reception circuit 231 matches the ID of the group to which the connected monitoring control unit belongs.
The received multicast packet is transferred to the reception buffer 234.
Output to

The collision prevention circuit 235 includes the reception circuit 2
The use state of the serial bus 10 is detected through the interface 31, and the result is output to the transmission control unit 243.

The reception buffer 234 includes the ID detection circuit 23
2 and stores the multicast packet stored in accordance with the instruction of the monitoring and control target unit transmitted via the device bus 20 in the device bus 20.
Output to

The transmission buffer 242 is provided for the monitoring control unit 2
The response packet output from 01 is input via the internal bus 20 and stored.

The transmission control unit 243 controls the transmission circuit 241, and when receiving a response packet transmission instruction from the monitoring / control target unit 201 via the internal bus 20, the serial bus 10 is output by the collision prevention circuit 235. The use state is confirmed, control is performed to transmit a response packet to the transmission circuit 241 when the serial bus 10 is not in use, the state of the serial bus 10 is confirmed again after the response packet is transmitted, and the serial bus 10 transmits. When detecting that the collision state is a state in which the plurality of packets collided, the transmission circuit 241 is controlled to retransmit the response packet after a random time.

The transmission circuit 241 outputs a response packet controlled by the transmission control section 243 and stored in the transmission buffer 242 to the serial bus 10.

FIG. 3 shows the data structure of a multicast packet in the in-device supervisory control system of FIG.

The multicast packet of the present invention includes a header section 301 indicating the multicast, a multicast destination group 302, and a multicast source ID 30.
3, multicast contents 304, and bits 311, 312, and 313 indicating a response result.

The header section 301 indicating the multicast is
Indicates that the packet is a multicast packet.

The multicast destination group 302 indicates a multicast group to which the multicast packet is transmitted.

The multicast source ID 303 indicates the ID of the device that has transmitted the multicast packet.

The contents 304 of the multicast store the contents of a request from the source to the destination of the multicast packet.

Bits 311, 312, 3 indicating response result
13 is a bit indicating the result of whether the previous alarm collection of the monitoring control target units 201 to 205 has succeeded or failed.

FIG. 4 shows a data structure of a response packet in the in-device monitoring control system of FIG.

The response packet of the present invention comprises a header 321 indicating a response, an ID 322 indicating a destination, and an ID of a source.
323, degeneration information 331 to 334 indicating the presence or absence of an alarm, and detailed information 341 and 343 of the alarm.

The header 321 indicating the response indicates that the packet is a response packet.

The ID 322 indicating the transmission destination indicates the ID of the destination to which the response packet is to be transmitted, and indicates the ID of the monitoring control unit 101 in the in-device monitoring control system of the present embodiment in FIG.

The ID 323 of the transmission source indicates the ID of the device that has transmitted the response packet, and in the in-device monitoring control system of this embodiment shown in FIG.
Any one of 5 is shown.

Degradation information 331 to 334 indicating the presence or absence of an alarm
Is information only on the presence or absence of various types of alarms.

The detailed alarm information 341 and 343 stores detailed information on an alarm when the degeneration information indicates that an alarm is present.

It is necessary for the monitoring control target units 201 to 205 to recognize the position within the multicast group. This method may be set in advance, or the monitoring control target units 201 to 205 and the serial bus termination may be used. Part 21
There are a method of setting by a physical position where 0 to 215 are mounted, a method of setting by a hardware switch, a method of setting by communication from the monitoring control device, and the like.

The monitoring / control target units 201 to 205
Depending on the position within the multicast group set by some method, the information among the bits 311 to 313 indicating the response result of the multicast packet is that of the monitoring control target unit, and the degeneration indicating where in the response packet there is an alarm. It is determined whether the information 331 to 334 should be stored.

Next, the operation of the embodiment of the present invention will be described.
This will be described with reference to the drawings.

FIG. 5 is a diagram showing a communication process of the in-device monitoring control system of FIG.

The monitoring control unit 101 is the monitoring control target unit 20
When a multicast packet is transmitted to the group 1 to which the multicast packets 1, 202, and 203 belong, the monitoring control target units 201, 202, and 203 that have received the multicast packet
Outputs a response packet to the received request to the monitoring control unit 101. Then, the monitoring control unit 101
When monitoring of one group is completed, a multicast packet for group 2 is transmitted, and monitoring is performed in the same manner. By repeating this operation, all the monitoring control target units 1201 to 1205 are monitored.

FIG. 6 is a flowchart showing the flow of the process of the monitoring control unit 101 in FIG.

As initialization processing in the monitoring control unit 101,
Set the ID required for serial communication, and
Set information about 01 to 205 (step 60)
0).

The monitoring control unit 101 performs time management, and when the time reaches the alarm collection cycle (step 60).
1), one of the collection target groups specified in advance according to the alarm collection cycle is selected and set as a multicast group (step 611). Next, a multicast packet for the multicast group is assembled by adding the result of the response in the previous alarm collection (step 612), and the multicast packet is transmitted (step 613).

If the time elapsed since the transmission of the multicast packet is within the set time (step 62)
1), confirm that responses have been returned from all monitoring control target units to be responded to by the multicast packet, and if there is a monitoring control target unit that has returned a response (step 622), check the contents of the response. (Step 623). If the received response packet is a normal response (step 624), the degeneration information 331 indicating whether or not there is an alarm
To 334 (step 625), and if it is indicated that there is an alarm, the detailed information of the alarm indicated to be present is searched and stored. If the received response packet is an abnormal response (step 624), the contents of the abnormality are stored (step 641).

When the time elapsed since the transmission of the multicast packet exceeds the set time (step 62)
1) Alternatively, when all the responses to be received have been received (step 622), if there is a monitoring control unit target whose response is not normal, the monitoring control unit target is regarded as abnormal and processed (step 622). 632).

FIG. 7 shows the serial bus terminator 21 in FIG.
9 is a flowchart showing the flow of processing of the monitoring control target units 201 to 205 and processing units 201 to 205.

First, as initialization processing, the monitoring control target units 201 to 205 set an ID required for serial communication and set a position in a multicast group (step 701).

The monitoring / control target units 201 to 205 perform time management, and if the multicast destination group 302 of the received multicast packet is the ID of the multicast group to which the monitoring / control target unit belongs (step 702), the setting is performed. Based on the position within the multicast group, based on the position in the multicast group, a bit indicating the result of the previous alarm collection in the monitoring control target unit is extracted from the bits 311 to 312 indicating the response result of the multicast packet (step 706). It is determined whether or not the alarm collection is abnormal.
7) The logical sum of the previously transmitted alarm information and the result of the in-device alarm collection is calculated, and the result is copied to the transmission buffer 242 as a response packet (step 709).
If the bit indicating the result of the previous alarm collection is normal (step 707), only the result of the current internal alarm collection is copied to the transmission buffer 242 as a response packet (step 708).

The response packet copied to the transmission buffer 242 is checked by the collision prevention circuit 235 when the unused state of the serial bus 10 is confirmed (step 71).
0), transmitted from the transmission buffer 242 via the transmission circuit 241 (step 711). Immediately after that, if a collision state is detected on the serial bus 10 by the collision prevention circuit 235 (step 712), if the number of retransmissions is within the specified number of times (step 713), the response packet is transmitted at an arbitrary time after the previous transmission. Retransmission is performed. (Step 711). If the number of retransmissions exceeds the specified number (step 713), or if the collision prevention circuit 235 has not detected a collision state (step 712), the process proceeds to the next.

(Second Embodiment) FIG. 8 shows an in-apparatus supervisory control system according to a second embodiment of the present invention.

In the first embodiment, the number of monitoring control target units is five. However, the number of monitoring control target units is expanded to _{n as in} the case of the monitoring control target units 200 ₁ to 200 _n in FIG. be able to. Also, the number of multicast groups can be expanded to M. In this case, as the number of monitoring control target units per one multicast group increases, the number of monitoring control target units that can be monitored by one multicast packet increases, so that the effect of the present invention becomes more remarkable.

(Third Embodiment) FIG. 9 shows an in-apparatus supervisory control system according to a third embodiment of the present invention.

[0107] The present embodiment, in the second embodiment of FIG. 8, the monitoring controller 101 and the monitoring control target unit 200 ₂₁ to
Eliminating the 00 _n control on the hierarchical relationship of the monitoring control unit 101
The in which a structure in which a supervisory control unit 200 ₁ to 200 DEG _n apposition.

[0108]

As described above, the present invention has the following effects. (1) Since a single multicast packet can request responses from a plurality of monitoring control target units, serial bus traffic can be reduced. (2) If the result of the previous alarm collection is not transmitted to the monitoring control unit for some reason because the result of the previous alarm collection is added to the multicast packet, the control / monitoring unit notifies the multicast packet transmitted by the next transmitted multicast packet. In order to transmit the logical sum of the previous and current collection results, the monitoring control unit waited for a response packet, but could not receive it due to timeout and did not repeat the operation of transmitting a response packet retransmission request. As a result, the alarm can be prevented from being missed, and the processing capability of collecting the alarm can be improved as a whole system. (3) Since the response packet is a variable length packet combining the degeneration information and the detailed information of the alarm, the processing amount can be reduced as compared with the fixed length packet, and the monitoring control target unit issues an alarm. In the normal case, only the degeneration information is transmitted in the response packet, so that the traffic on the serial bus can be reduced, and the load on the processing of the response packet received by the monitoring control unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an in-device monitoring control method according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a serial bus termination unit 211 in FIG.

FIG. 3 is a diagram showing a data structure of a multicast packet in the in-device monitoring control system of FIG. 1;

FIG. 4 is a diagram showing a data structure of a response packet in the in-device supervisory control system of FIG. 1;

FIG. 5 is a diagram showing a communication process of the in-device monitoring control system of FIG. 1;

FIG. 6 is a flowchart showing a process of a monitoring control unit 101 in FIG.

FIG. 7 is a flowchart showing the processing of the serial bus terminating units 211 to 215 and the monitoring control target units 201 to 205 in FIG.

FIG. 8 is a block diagram illustrating an in-apparatus supervisory control system according to a second embodiment of the present invention.

FIG. 9 is a block diagram illustrating an in-device monitoring control method according to a third embodiment of the present invention.

FIG. 10 is a block diagram showing a conventional in-device monitoring control method.

11 is a block diagram of a serial bus terminating unit 1211 in FIG.

FIG. 12 is a diagram showing a data structure of a request packet in the conventional in-device monitoring control system of FIG.

FIG. 13 is a diagram showing a data structure of a response packet in the conventional in-device monitoring control system of FIG.

FIG. 14 is a diagram showing communication processing of the conventional in-device monitoring control system of FIG.

FIG. 15 is a flowchart showing a process of the monitoring control unit 1101 in FIG.

16 is a diagram illustrating serial bus terminators 1211 to 1 in FIG.
215 is a flowchart illustrating processing of the monitoring control target units 1201 to 1205.

[Explanation of symbols]

1,2 Group 10 serial bus 20 device bus 101. The monitoring controller 111 a serial bus termination unit 200 ₁ to 200 DEG _n supervisory control unit 201 to 205 supervisory control unit 210 ₁ to 210 _n serial bus termination 211-215 serial bus Terminator 231 Receiving circuit 232 ID detecting circuit 233 Receiving control unit 234 Receiving buffer 235 Collision preventing circuit 241 Transmitting circuit 242 Transmit buffer 243 Transmission controlling unit 301 Multicast destination group 302 Multicast destination group 303 Multicast source ID 304 Multicast contents 311, 312, 313 Bits indicating the response result 321 Header section indicating the response 322 ID of the transmission destination 323 ID of the transmission source 331-334 Degenerate information 341, 343 Details of the alarm Information 600 to 602 Step 611 to 613 Step 621 to 626 Step 631, 632, 641 Step 701 to 713 Step 1101 Monitoring control section 1111 Serial bus termination section 1201 to 1205 Monitoring control target section 1211 to 1215 Serial bus termination section 1231 Receiving circuit 1232 ID detection circuit 1233 Reception control unit 1234 Reception buffer 1241 Transmission circuit 1242 Transmission buffer 1243 Transmission control unit 1301 Header indicating request 1302 ID of transmission destination 1303 ID of transmission source 1304 Contents of request 1311 Header indicating response 1312 Destination of transmission ID 1313 ID of sender 1314 Contents of response 1501 to 1503 Steps 1511, 1512, 1521, 1522 Steps 1531 to 1536 Step 1 541,1551,1561 steps 1601-1604 steps 1611-1615 steps 1621,1631,1641 steps

Claims (4)

[Claims] 1. A request packet for transmitting a request for collection of an alarm held by a monitoring control target unit and a request to be transmitted to the monitoring control target unit for confirming a normal operation of a serial bus is fixed. A monitoring control unit that outputs a request packet transmitted from the monitoring control unit to the serial bus, and transmits the request packet from the other device connected to the serial bus to the monitoring control unit via the serial bus. A first serial bus terminating unit that receives the transmitted response packet and transmits the received response packet to the monitoring control unit; and a first serial bus terminating unit that is connected to the serial bus and is connected to the plurality of monitoring control target units in a one-to-one manner by an internal bus. And the first
Receiving, via the serial bus, a request packet output from the serial bus terminating unit, and if the received request packet is a request packet transmitted to the connected monitoring control target unit, the request packet is subjected to the monitoring control. A plurality of second serial bus terminating units for transmitting a response packet output from the monitoring control target unit to the target unit via the internal bus and transmitting the response packet to the serial bus; In the case where a request packet transmitted via the internal bus is a request packet requesting collection of an alarm, the held alarm is collected and held as an answer packet, and the held alarm is used as a response packet. A plurality of monitoring control units that output the request packet to the plurality of monitoring control units. To the target unit, device monitor and control system, which is a multicast packet can request a response at a time. 2. A reception control unit, wherein each of the monitoring control target units controls a reception circuit so as to capture a multicast packet output to a serial bus in accordance with an instruction of the monitoring control target unit transmitted via an internal bus. A receiving circuit that is controlled by the reception control unit, receives a multicast packet output to the serial bus, and outputs the received multicast; and a destination group ID included in the multicast packet output from the reception circuit. If the ID matches the ID of the group to which the connected monitoring control target unit belongs, an ID detection circuit that outputs the input multicast packet; and a use state of the serial bus is detected via the reception circuit. A collision prevention circuit for outputting a signal, and a multicast output from the ID detection circuit. A receiving buffer for storing a packet, outputting a multicast packet stored according to the instruction of the monitoring control target transmitted via the device bus to the internal bus, and a response packet output from the monitoring control target. A transmission buffer for inputting and storing via the internal bus, and upon receiving a response packet transmission instruction from a monitoring control target unit via the internal bus, the use state of the serial bus is determined by the output of the collision prevention circuit. Confirming, performing control to transmit the response packet to the transmission circuit when the serial bus is in an unused state, reconfirming the state of the serial bus after transmitting the response packet, and When it is detected that the packet is in a collision state, which is a state in which the packet has collided, the transmitting circuit A transmission control unit that controls retransmission of the response packet after an arbitrary time; and a transmission circuit that is controlled by the transmission control unit and outputs a response packet stored in the transmission buffer to the serial bus. 2. The in-device monitoring control method according to 1. 3. The monitoring control method in the device according to claim 1, wherein the multicast packet has information indicating a result of a previous alarm collection, and the monitoring control target unit receives the multicast packet. When the information indicates that the result of the previous alarm collection is normal, only the alarm to be transmitted this time is transmitted by the response packet, and when the information indicates that the result of the previous alarm collection is abnormal. 2. The in-device monitoring control method according to claim 1, wherein a logical sum of a previously transmitted alarm and an alarm to be transmitted this time is calculated, and the calculation result is transmitted as a response packet. 4. The intra-apparatus supervisory control system according to claim 1, wherein, when each of the supervisory control target units transmits the alarm in a response packet, the degeneration information, which is information on only the presence or absence of the alarm, When there is an alarm, the detailed information of the alarm is transmitted in a response packet, and the monitor control unit, upon receiving the response packet, performs only the alarm indicated as being present by the degeneration information. In-device monitoring control method.