JPH08275261A - Aggregated terminal unit for multiplex transmission monitor control system - Google Patents

Abstract

PURPOSE: To prevent transmission of erroneous status change data and occurrence of loss of control or malfunction from a common share memory through a multiplex processing section in the aggregated terminal unit. CONSTITUTION: The system is provided with a time division multiplex signal processing section 7 having a CPUS and controlled by the CPUS, a main control section 6 having other CPUM and controlled by the CPUM, and a common share memory 1 having a communication area 1a used in common for data communication by both the time division multiplex signal processing section 7 and the main control section 6. The common share memory 1 is provided with a transmission information area 1b storing status change data sent from the common share memory transmission section 2 to a communication area 1a, a reception information area 1c storing the status change data received by the communication area 1a by the common share memory reception section 3, and a state comparison section 4 comparing the status change data stored in the transmission information area 1b and the reception information area 1c and discriminating the coincidence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring data, control data, and interrupt request data to which an address is added to a collective terminal unit for monitoring a plurality of monitoring terminals set by assigning addresses from a central monitoring control device. The present invention relates to an improvement of an aggregate terminal unit used in a multiplex transmission supervisory control system configured to control a plurality of supervisory terminals connected to the aggregate terminal unit by transmitting and receiving.

[0002]

2. Description of the Related Art In a conventional multiplex transmission supervisory control system,
Multiple centralized terminal units are connected to the central supervisory control unit by multiplex transmission lines, and monitoring data and control data with specified addresses are transmitted and received between the central supervisory control unit and the collective terminal units by time division multiplexing. The monitoring terminal connected to the collective terminal unit can be monitored and remotely controlled.

Such a supervisory control system is constructed as shown in FIG. 10 and is widely used for lighting control of buildings and the like, and is sent to the central supervisory control unit 100 via a multiple signal line L. When the monitoring data is sent to the connected collective terminal unit 101 by the polling method, the collective terminal unit 101 receives the status data from the additionally connected monitoring terminal 102, and when the status changes, the collective terminal unit 101 transmits the status data. Central supervisory control device 10
The central monitoring control device 100, which has received the status change data from 0 and has received the status change data from the collective terminal unit 101, returns the control data designating the address of the monitoring terminal 102 to the collective terminal unit 101. Then, the monitoring terminal 102 of the designated address is remotely controlled.

FIG. 11 is a diagram showing the flow of signal processing of a collective terminal unit used in such a supervisory control system. This collective terminal unit 101 has a plurality of monitoring terminals (for example, monitoring contacts), reads the status of each monitoring contact, compares the read status with the previous status, and detects a status change. The state change reception buffer 1 stores the address and state change data corresponding to the monitoring contact.
The state change detection unit 101b stored in 01a, the address and state change data stored in the state change reception buffer 101a are taken out, and the address and change data of the monitoring contact having the state change are written in the communication area of the shared memory 101c. The shared memory receiving unit 101f and the state change transmission buffer 101e which take out the address and the state change data stored in the communication areas of the memory transmission unit 101d and the shared memory 101c and store them in the state change transmission buffer 101e.
The time-division-multiplexed-signal transmitting unit 101h is configured to take out the address and the state change data stored in the time-division-multiplexed signal processing unit 101g.

Such a conventional collective terminal unit 101
Then, when affected by noise from the outside or the like, erroneous state change data is transmitted from the shared memory transmission unit 101d to the shared memory reception unit 101f, and is transmitted to the central monitoring control device 100 as it is. There are problems such as malfunction of control and leakage of control, and effective means for preventing this problem have been left unsolved.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when the collective terminal unit sends erroneous state change data to the central processing unit,
It is an object of the present invention to provide a multiplex transmission monitoring control system capable of detecting data abnormality. A second object is to provide a multiplex transmission supervisory control system capable of correcting incorrect status change data when the collective terminal unit sends incorrect status change data to the central processing unit.

[0007]

A collective terminal unit of the present invention proposed to achieve the above object comprises a CPU, a time division multiplex signal processing section controlled by the CPU, and another CPU. A main controller controlled by the CPU, a shared memory having a communication area commonly used for data communication by both the time division multiplex signal processor and the main controller, and a monitoring terminal A state change detection unit that captures state change data together with an address, a shared memory transmission unit that transmits the state change data detected by the state change detection unit together with an address to a communication area of the shared memory, and communication between the shared memory It is provided with a shared memory receiving unit that sends the state change data stored in the area together with the address to the time division multiplex signal processing unit. The shared memory includes a transmission information area for storing state change data sent from the shared memory transmission section to a communication area, and a reception information area for storing state change data received by the shared memory reception section from the communication area. A state comparison unit that compares the state change data corresponding to the same address stored in the transmission information area and the reception information area and determines a match is provided.

Further, the collective terminal unit proposed in claim 2 is provided with a correction data generating section for generating correction data and a state change correction buffer in claim 1, and the transmission information area and the reception information area are provided in the transmission information area and the reception information area. When a mismatch occurs in the stored status change data of the same address,
The correction data generated by the correction data generation unit is stored in the state change correction buffer, fetched by the shared memory transmission unit, and retransmitted to the communication area of the shared memory.

Further, the aggregate terminal unit proposed in claim 3 is the aggregate terminal unit according to claim 1 or 2, wherein the transmission information area and the reception information area of the shared memory are addresses of a plurality of monitoring terminals previously monitored by the aggregate terminal unit. It has a configuration in which a state change data storage area corresponding to the above is provided.

[0010]

According to the multiplex transmission supervisory control system of the present invention, the following operations are performed. That is, in claim 1, the state change detection unit of the collective terminal unit reads the states (for example, monitoring contacts) of a plurality of monitoring terminals, compares them with the previously received state data, and the state data is different. If so, the address of the monitoring terminal and the state change data are stored in the state change reception buffer.

The shared memory transmission unit transfers the address and the state change data stored in the state change reception buffer to the communication area and the transmission information area of the shared memory, and the shared memory reception unit stores them in the communication area of the shared memory. The changed address and the state change data are transferred to the state change transmission buffer and the reception information area. The address and the state change data stored in the state change transmission buffer are sent to the central supervisory control device through the multiplex signal line by the time division multiplex signal processing unit.
According to the present invention, every time the address and the state change data stored in the state change reception buffer are sent from the shared memory transmission unit to the communication area of the shared memory, they are stored in the transmission information area, and the shared memory reception unit uses this communication. Each time the address and the state change data stored in the area are received, the received address and the state change data are stored in the reception information area. Therefore, the state comparison unit performs the shared memory transmission unit and the shared memory reception in this way. When a series of transfer operations of the address and the state change data by the unit are completed, the data stored in the transmission information area and the data stored in the reception information area are discriminated from each other.

As a result of this determination, if the addresses stored in the transmission information area and the reception area and the state change data do not match, the state comparison unit determines that erroneous state change data has been read from the communication area. Report an abnormality. Also,
In the second aspect, when the state comparison unit determines that they do not match, the state change correction data generation generates the correction data and stores the generated correction data in the state change correction buffer. Therefore, in the shared memory transmission unit, the correction is performed. The data is transferred to the communication area of the shared memory again, and the error of data transfer is automatically corrected. The corrected state change data is sent from the multiplex transmission processing unit to the central monitoring unit through the multiple signal line. It will be sent out.

That is, according to the second aspect, the shared memory transmission unit receives the state change data in the state change buffer, that is, the state change data sent from the shared memory transmission unit to the communication area and the shared memory reception from the communication area. If the state change data received by the unit does not match, the address and the state change data stored in the state change correction buffer are retrieved, and the retrieved state change data is stored in the communication area.

However, when there is no state change data in the state change correction buffer, that is, the state change data sent from the shared memory transmission unit to the communication area matches the state change data received from the communication area by the shared memory reception unit. If so, the address and state change data stored therein are taken out from the state change receiving buffer, new state change data is sent to the communication area, and state change data is stored in the transmission information area.

The shared memory receiving unit on the other hand takes out the address and the state change data stored in the communication area, stores them in the state change transmission buffer, and stores them in the reception area. As a result, the data sent by the shared memory transmission unit to the communication area is selected according to the determination result of the state comparison unit,
If the state comparison unit determines that they match, the address and state change data stored in the state change reception buffer are sent to the multiplex transmission processing unit, and if the state comparison unit determines that they do not match, the state change correction is performed. The address and state change data stored in the buffer are sent to the multiplex transmission processing unit.

According to the present invention, by the above operation, in the collective terminal unit (between the communication area and the multiplex transmission controller)
Even if the state change data changes due to the influence of noise and the like and the wrong state change data is sent to the central processing unit, the state change data can be immediately corrected.

[0017]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an example of a collective terminal unit A which is a main part of the present invention, and FIG. 2 is a block diagram showing a flow of signal processing in the collective terminal unit A. In FIG. 1, 1 is a shared memory, 2 is a shared memory transmitting unit, 3 is a shared memory receiving unit, 4 is a state comparing unit, 5 is a monitoring terminal 9 ... A detection unit, a main control unit 6 having a CPU M for main control, a reference numeral 7 a time division multiplex signal processing unit having a CPU S for multiplex transmission control, and the shared memory 1 includes both CPs.
The shared memory 1 constitutes a dual port memory that can be accessed by the UM and CPUS.
a, a transmission information area 1b, and a reception area 1c.

As shown in FIG. 4, the communication area 1a has a storage area for storing a synchronization flag for indicating reception and transmission for synchronizing data communication, a monitoring terminal address, and status change data. As shown in FIGS. 5 and 6, the transmission information area 1b and the reception information area 1c are provided with storage areas 0 to 63 corresponding to the monitoring terminals 9 ... Which are monitored by the collective terminal unit A. , These storage areas are assigned with a number of addresses corresponding to the monitoring terminals 9 ...
The state change data can be stored.

In the present invention, every time the shared memory transmitter 2 sends the address received from the state change detector 5 and the state change data to the communication area 1a of the shared memory 1, the data is stored in the transmission information area 1b. In addition, each time the shared memory receiving unit 3 receives the address and the state change data stored in the communication area 1a, the shared memory receiving section 3 stores the data in the reception information area 1c.
Since it is also stored in the state comparison unit 4,
If it is determined that they do not match,
An abnormality is reported (claim 1).

Further, in the actual collective terminal unit, FIG.
As shown in FIG. 5, a state change reception buffer 5 a for storing an address and state change data is provided between the state change detection unit 5 and the shared memory transmission unit 2 and the shared memory reception unit 2
A state change transmission buffer 3a is provided between the time-division multiplex signal processing unit 7 and the time-division multiplex signal processing unit 7. Further, FIG. 3 shows a main part configuration of an aggregate terminal unit according to claim 2, and a correction data generation unit 10 is further provided between the shared memory transmission unit 2 and the state comparison unit 4, and the state In the comparison unit 3, when the transmission information area 1b of the shared memory 1 and the state change data stored in the reception information area 1c do not match,
The correction data generation unit 10 generates correction data and stores it in the state change correction buffer 10a, so that the address and the state change data in the communication area 1a are corrected correctly.

For example, the transmission information area 1a of the shared memory 1
Address 0 is "10100101" (ON, ON, O
FF, OFF), the address 0 of the reception information area 1c of the shared memory 1 is "10100101" (ON, ON, OF)
F, OFF), even if the shared memory transmitter 2 writes the address “0” state change data “01001000” (OFF, no change, ON, no change) in the communication area 1a of the shared memory 1. Nevertheless, the shared memory receiving unit 3 sends an address "from the communication area 1a of the shared memory 1".
0 ", status change data" 01011010 "(OFF,
Shared memory 1 when it receives (OFF, ON, ON)
Of the transmission information area 1b of "01101001"
(OFF, ON, ON, OFF), the address 0 of the reception information area 1c of the shared memory 1 is "01011010" (O
FF, OFF, ON, ON), the central monitoring and control unit 8 has the address "0" and the state change data "010".
11010 ″ (OFF, OFF, ON, ON) is sent, and status change data different from the actual status change is notified.

However, in the present invention, the state comparison unit 4
However, when a difference between the address 0 of the transmission information area 1b of the shared memory 1 and the address 0 of the reception information area 1c of the shared memory 1 is detected, the correction data generation unit 1
If 0, the correction address is 0, and the correction information is “00100000.
1 "(no change, ON, no change, OFF) is generated as correction data and stored in the state change correction buffer 10a.

Then, the shared memory transmission unit 2 recognizes that there is correction data in the state change correction buffer 10a, reads the address and the state change data from the state change correction buffer 10a, and writes them in the communication area 1a of the shared memory 1. , Address 0 and correction data “00100001” (no change,
(ON, no change, OFF) is written in the communication area 1a.

As a result, the shared memory receiver 3 receives the address 0 and the state change data from the communication area 1a of the shared memory 1.
00100001 "(No change, ON, No change, OF
F) is read out, and the central monitoring and control unit reads address 0 and state change data "00100001" (no change, O
N, no change, OFF) is sent, and correct interrupt data is notified together with the interrupt data sent last time.

Steps 100 to 109 of FIG. 7 are flowcharts showing the basic operation of the shared memory transmission unit. The shared memory transmission unit 2 refers to the synchronization flag prior to sending the state change data to the communication area 1a of the shared memory 1. When the synchronization flag of the communication area 1a is being received, sending of the state change data to the communication area 1a is prohibited. When it is being transmitted, the state change correction buffer 10a (buffer 3) is referred to, If you have the data,
After reading, writing the address and the state change data to the communication area 1a of the shared memory 1, and ending the writing,
Put the sync flag in reception.

On the other hand, if there is no data in the state change correction buffer 10a (buffer 3), the state change reception buffer 5
a (buffer 1) is referred to, if there is data, read,
The address and the state change data are written in the communication area 1a of the shared memory 1, and after the writing is completed, the synchronization flag is set to the receiving state, and the writing of new data is prohibited.

Steps 200 to 205 in FIG. 8 are flowcharts showing the basic operation of the shared memory receiving section. The shared memory receiving unit 3 refers to the synchronization flag prior to receiving the state change data from the communication area 1a of the shared memory 1. When the synchronization flag of the communication area 1a is being received, the address and the state change data are read from the communication area 1a, the state change transmission buffer 3a (buffer 2) is referred to, and if writable, it is written there. Further, the address and the state change data are written in the reception area 1c of the shared memory 1, and after the writing is completed, the synchronization flag is set to the transmitting state and the reading is prohibited.

Steps 300 to 306 in FIG. 9 are flow charts showing the basic operation of the state comparing section 4. In the figure, in the state comparing section 4, all state changes stored in the transmission information area and the receiving area are changed. It is possible to determine whether the data match.

[0029]

According to the collective terminal unit of the present invention described in claim 1, erroneous state change data is transmitted from the shared memory transmitter to the shared memory receiver, and the erroneous state change data is centrally controlled. Even when the data is transmitted to the device, the state comparison unit compares the state of the transmission information with the state of the reception information, and when a discrepancy is determined, the abnormality is notified, which is useful for malfunction and control leakage.

According to the collective terminal unit of the present invention as set forth in claim 2, erroneous state change data is transmitted from the shared memory transmitter to the shared memory receiver, and the erroneous state change data is centrally monitored and controlled. Even when the data is transmitted to the device, the status comparison unit compares the status of the transmission information with the status of the reception information, and when a mismatch is determined, the correction data generation unit generates the correction data and shares the correct state change data. Since it is stored in the communication area of the memory, highly reliable monitoring control without malfunction or control omission can be realized.

Further, according to the collective terminal unit of the present invention as set forth in claim 3, the status comparing section can determine an error in transmission of status change data fetched from all the monitoring terminals.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a basic configuration of a collective terminal unit of the present invention.

FIG. 2 is a block diagram showing a flow of signal processing in the collective terminal unit of the present invention.

FIG. 3 is a block diagram showing an example of a main part configuration (claim 2) of the collective terminal unit of the present invention.

FIG. 4 is a diagram showing a schematic configuration of a communication area of a shared memory.

FIG. 5 is a diagram showing a configuration of a transmission information area of a shared memory.

FIG. 6 is a diagram showing a configuration of a reception information area of a shared memory.

FIG. 7 is a flowchart illustrating a basic operation of a shared memory transmission unit.

FIG. 8 is a flowchart for explaining a basic operation of a shared memory receiving unit.

FIG. 9 is a flowchart for explaining a basic operation in a state comparison unit.

FIG. 10 is a system schematic diagram showing a basic configuration of a multiplex transmission monitoring control system.

FIG. 11 is a block diagram showing a basic configuration of a conventional collective terminal unit.

[Explanation of symbols]

 A ... Collective terminal unit 1 ... Shared memory 2 ... Shared memory transmission unit 3 ... Shared memory reception unit 3a ... State change transmission buffer (buffer 2) 4 ... State comparison unit 5. ..State change detecting unit 5a ... State change receiving buffer (buffer 1) 6 ... Main control unit M ... Main CPU 7 ... Time division multiplexed signal processing unit S ... Multiple transmission processing CPU 8 ... Central control monitoring device 9 ... Monitoring terminal 10 ... Correction data generation unit 10a ... State change correction buffer (buffer 3) L ... Multiple signal line

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Claims (3)

[Claims] 1. A central monitor control unit is connected with a collective terminal unit for monitoring a plurality of monitor terminals to which unique addresses are assigned, via a multiple signal line, and monitor data is provided between them.
An aggregate terminal unit used in a multiplex transmission supervisory control system in which control data and interrupt request data are transmitted in a time-division multiplex manner so that the central supervisory controller can monitor and control a plurality of terminal devices connected to the aggregate terminal unit. In the above, the collective terminal unit includes a CPU, a time division multiplex signal processing unit controlled by the CPU, another CPU, a main control unit controlled by the CPU, and the time division multiplex signal processing unit. Both the main control unit and the shared memory that has a communication area commonly used for data communication by the main control unit and the state data from the monitoring terminal are used to determine the state change and generate the state change data together with the address. The state change detection unit that performs the change and the state change data generated by the state change detection unit are A shared memory transmitting unit for transmitting to the communication region of the existing memory; and a shared memory receiving unit for transmitting the state change data stored in the communication region of the shared memory to the time division multiplex signal processing unit together with an address, In the shared memory, a transmission information area for storing state change data sent from the shared memory transmission section to the communication area, and a reception information area for storing state change data received by the shared memory reception section from the communication area, A collective terminal unit configured to include a status comparison unit that compares status change data corresponding to the same address stored in the transmission information area and the reception information area and determines whether they match. 2. The collective terminal unit according to claim 1, further comprising a correction data generation unit for generating correction data and a state change correction buffer, wherein the same address stored in the transmission information area and the reception information area is stored. When the state change data does not match, the correction data generated by the correction data generation unit is stored in the state change correction buffer, captured by the shared memory transmission unit, and retransmitted to the communication area of the shared memory. A collective terminal unit configured to do so. 3. The transmission information area and the reception information area of the shared memory are each provided with a state change data storage area corresponding to the addresses of a plurality of monitoring terminals monitored by a collective terminal unit in advance. Item 1. The collective terminal unit according to item 1 or 2.