JPS6180445A - Connection/switching device between remote monitoring control device and multi-computer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a remote monitoring and control system comprising a remote monitoring and control device and a multi-computer, and relates to a patent and monitoring system.

The present invention relates to a remote monitoring control device and a multi-computer connection/switching device suitable for a load sharing system in which control objects are shared and processed by multiple computers.

[Background of the invention]

Conventionally, remote monitoring and control devices and computers have been connected separately, and each computer inputs information from the remote monitoring and control device simultaneously, but the present invention allows for switching when a connected device becomes abnormal. There is no example of one line being used. In other words, no consideration was given to the increased processing load on the computer due to computer switching.

(Refer to Japanese Unexamined Patent Publication No. 57-92992) [Object of the Invention] An object of the present invention is to provide a load-sharing multi-computer system in which a plurality of remote slave stations are shared and monitored and controlled by a plurality of computers. Connections and switching that can be distributed are possible.

[Summary of the invention]

As shown in Fig. 7, conventional load-sharing multi-computer systems are connected separately to m remote monitoring and control devices, and computers b1 to bn share responsibility for monitoring and controlling a, ~a, respectively. There are many systems that do this. In the previous case, bl-b.

Since all functions are the same, this is the worst case scenario.

It is now possible to process all information from a1 to bIl+ with just one.

Therefore, if the connection device between the remote monitoring control device and the computer becomes abnormal, the computer processing the relevant information is switched to continue processing. this is.

This is the same method that when other input/output devices connected to a computer or important devices in the auxiliary storage device become abnormal, the processing computer for the relevant task is switched to continue processing.

However, this method cannot distribute the processing and reduce the processing load on the computer. Recently, there has been a tendency for the number of tasks performed on computers to increase, as well as the amount of information handled by computers, which increases the computer load and affects processing performance. Considering these points, we continued the process without switching the computer,
We devised a method to maintain load distribution.

Compared to conventional systems, the present invention does not require additional hardware.

[Embodiments of the invention]

FIG. 1 shows a connection state between a remote monitoring and control device of the present invention and a multi-computer. A computer system 100 connects each of the remote monitoring and control devices 10, 20, 30, and 40 to line connection devices 11, 21, 30, and 41. via lines 110, 120,
130, 140 are computer side line connection devices 101, 10
It is connected to 2,103°104. Similarly to computer system 100, computer system 200 also has line connections from each of the remote monitoring and control devices! i! Line 2 via 12, 22, 32.42
10.220, 230, and 240 are connected to line connection devices 201, 202, 203, and 204 on the computer side.

The same data is simultaneously transmitted to the lines from each remote monitoring and control device to the computers 100 and 200. calculator 1
00 and 200 are connected by a shared memory 6, allowing data to be exchanged between the computers. If,
If the line 110 has an abnormality in the line connection device 11 or 101, or
If data cannot be exchanged due to an abnormality in the line itself, the computer 200 receives input data from the line 210, sets the data on the shared memory 6, and the computer 100 receives and processes the data. ,or,
When transmitting data, the computer 100 sets the transmission data in the shared memory 6, and the computer 200 outputs the data to the remote monitoring and control device 10 via the line 210.

FIG. 2 shows the flow of processing realized by software inside the computer. Transmission/reception processing 1 exchanges data with the line. If the line connecting to the other system computer is normal and there is no need for backup, the input data for the line related to the other system is transferred to the own system related data without processing. This exchange is performed between the received data editing process 2 and the sending data editing process 3. Reference numeral 7 indicates a CRT for displaying received data and setting transmission data. Reference numeral 9 indicates a typewriter 1 system board, etc. for printing and displaying received data. The shared memory shown in 6 serves as a bridge between computers when data is sent and received using a line connected to the same remote monitoring and control device connected to another system due to an error in the own system line. . Therefore, if the line on the computer 100 side becomes abnormal, the data reception route using the line connected to the same remote monitoring and control device as that on the computer 200 side is determined by the sending/receiving process 1 of the computer 200. sets the discarded data on the shared memory 6, and the received data editing process 2 on the computer 100 side receives the data and displays or prints it. Regarding transmission data, data input from a CRT or the like is set on the shared memory 6 in a transmission data editing process 3, and is transmitted in a transmission/reception process 1 on the computer 200 side.

Figures 3 and 4 show the transmission/reception processing on the computer side with the normal line when the line is abnormal and the received data editing process on the computer side with the abnormal line. Figure 4 70 shows the backup from the computer side with the abnormal line. It is determined whether the request is necessary, and if it is necessary, the data that would have been discarded in normal times is set in the shared memory at 80, and the received data editing process on the computer side having the abnormal line is started at 90. At 50 in FIG. 3, it is determined that backup is in progress by activation from the transmission/reception process of another system, and at 60 data on the shared memory is fetched. FIGS. 5 and 6 show the transmission data editing process on the side of the computer with the abnormal line when the line is abnormal, and the transmission/reception process on the computer side with the normal line. Step 705 in FIG. 5 determines whether backup is necessary. If backup is required at 710, the transmitted data is set on the shared memory. 72
0 starts the transmission/reception processing on the computer side that has a normal line.

When it is determined in 705 that the line backup is not possible, the data is read out (730), and in 800 of FIG. 6, it is determined whether or not backup is being performed by activation from the sending/receiving data editing process of another system. 900 is during backup,
Sends the data on the shared memory to the backup line.

The processing load on the computer for transmitting and receiving data between the remote monitoring and control device and the computer varies depending on the number of slave stations to be monitored and controlled and the amount of data, but is usually 5 to 10%. In contrast, edit the received data.

Statistics, output processing, and control request processing pond processing are 30
~40% (at high loads, it can reach 70~80%).

Conventionally, in order to switch the computer when a connected device fails, for example,
The processing that used to be shared between two machines is now done by one machine, and the processing load on the computer is simply doubled, that is, (35 to 5
0) X2=70-100%. In reality, there are cases where the same processing occurs, so even if we consider it to be 60 to 90%, it is clear that the processing performance will be worse.

In contrast, in the present invention, data transmission and reception processing is handled by a single computer, but the processing load on the computer is high.

(1) Connected device abnormal system: 30-45% The processing load for data transmission and reception is slightly reduced.

(2) Data intermediary system: 40-60% The above is (5-10) + (30-40) + (5-10)
It is calculated by

Also, in the present invention, if two or more sets of connected devices are abnormal.

Furthermore, if the data is being processed by a needle calculator, the computer that sends and receives the data and the computer that processes the data cross-process each other and continue processing, but with the conventional method, data cannot be sent or received with at least one of the connected devices that has become abnormal. becomes.

〔Effect of the invention〕

According to the present invention, it is possible to perform connections and switching that can distribute the processing load of computers in a load-sharing multi-computer system in which monitoring and control are shared between multiple remote slave stations and multiple computers.

[Brief explanation of the drawing]

Fig. 1 is a connection state diagram between a control device and a loadsure computer according to an embodiment of the present invention, Fig. 2 is a configuration diagram of software that performs transmission and reception inside the computer, and Figs. 3 and 4 are diagrams when a line abnormality occurs. Figures 5 and 6 show the sending/receiving processing on the computer side with a normal line and the received data editing process on the computer side with an abnormal line. FIG. 7 is a flowchart of transmission and reception processing on the side of a computer having a line, and is a connection state diagram between a conventional control device and a load sharing computer. a l dl ”'a 1ldl ”'substation, 81
~allllo120.30.40... Remote monitoring control device, a, d. ~a lld n, b, dl ~b rl
d,, 11. 12°21, 22. 31.
32. 41. 42. 101゜102, 103
．． 104. 201. 202,203゜204...
・Line connection device, b, -b,, 100°200...
Computer, c, 6... Shared memory, 1... Transmission/reception processing, 2... Received data editing processing, 3... Transmission data editing processing, 7... CRT, 8... Typewriter-19
...Systematic board.

Claims (1)

[Claims] 1. A remote monitoring and control system consisting of a remote monitoring and control device for controlling the devices of multiple remote slave stations and monitoring their status, and a computer that is connected to the master station and sends and receives data. In a load sharing system in which the computers have a multi-configuration, each computer is connected by a shared memory, and the slave stations to be controlled and monitored are shared and processed, If all the connection devices are connected separately, and some of the connection devices become abnormal and the computer is unable to send and receive necessary data, the computer with the other healthy connection devices,
A connection/switching device between a remote monitoring control device and a multi-computer, characterized by mediating data transmission and reception.