JPS5872267A - Computer device for supervising dual system status - Google Patents

Abstract

PURPOSE:To speed up the switching of the titled computer even when an auxiliary storage device is used in common by detecting the last status information processed by a main system in a queued system at the failure of the main system and allowing the queued system to continue status detecting processing from the succeeding status information. CONSTITUTION:Status information is inputted both main and queued systems. When a computer in the main system stops, a computer in the queued system reads out the remote control information finally processed by the main computer which is left in a remote control information input waiting table 11 from a processed pointer 19, retrieves the same information as the read-out information from a remote control information input waiting table 17 and then starts processing from the succeeding remote control information. Consequently the computer in the queued system can continue the processing of status information immediately after switching the computer from the main system to the queued system.

Description

[Detailed Description of the Invention] The present invention monitors the status of plant equipment such as the disconnected status of circuit breakers and the disconnected status of ventilation fans, detects changes in the status, and performs various processes. This invention relates to a heavy system condition monitoring computer device.

FIG. 1 shows a typical conventional configuration of a system using a computer that monitors the status of plant equipment, detects changes in the status, and performs various processes.

Plant equipment (not shown) to be monitored exists in physically distant locations, and information on the status of these plant equipment is collected by remote monitoring and control device slave stations 1 located at various locations. This collected information is transmitted to the remote monitoring and control device master station 2 through the transmission line. The status information (information on the status of each plant equipment) transmitted to the remote monitoring and control device master station 2 is taken into the computer 3. The status information captured in this way is stored in the electronic computer 3,
After that, the computer 3 displays the current status of the plant equipment on the system panel, displays it on the CRT screen, etc., and outputs alarms and types when the status of each plant equipment changes (hereinafter referred to as status change). Processing such as printing on the writer is performed. In the remote monitoring and control device master station 2, there are two methods: one in which all of the state information is periodically transmitted to the computer 3 at all times, and the other in which it is transmitted only when a state change occurs.

In such a conventional state monitoring computer device, in order to reduce the time during which the computer 3 is out of function due to a failure, it has a dual system configuration in which two computers are installed. However, in the case of such a dual system configuration, there is a technical problem that must be solved: how to process all changes in the status communicated before and after switching between the two computers.

The ts2 diagram shows an example of a conventional dual system status monitoring computer device. Information from the remote monitoring and control device master station 2 is taken in by the interface device 4 prepared for each of the two computers, and the current state information and status change information taken in by the interface device 4 are sent to the central processing unit. The information is stored in an internal storage device within the device 5 or in an auxiliary storage device 6 connected to each central processing unit 5, and used for subsequent processing. Processing regarding the captured information is carried out by two computers, but the input/output device 7 is usually duplicated for final display on the system panel, display on the CRT, printing on the typewriter, etc. Therefore, the data is output from only one of the computers via the input/output switching device 8.

The computer currently performing input/output (hereinafter referred to as the main system)
When the system fails and another system (hereinafter referred to as the time system) backs up the input/output processing as the main system, the backup of status change information output is resumed a sufficient amount of time from the time of switching. In this case, some pieces of information may be output twice, but normally such duplication does not pose a big problem for the condition monitoring system.

Now, in recent years, a third
A redundant computer device with the configuration shown in the figure has appeared. That is, in the example shown in FIG. 2, the auxiliary storage device 6 is individually connected to each central processing unit 5, whereas in the example shown in FIG. is shared by the two central processing units 5, and a shared high speed storage device 9 is also provided which is shared by both central processing units 5.

Continuous processing of status change information at the time of computer switching in such a duplex computer system is performed as follows.

Current state storage information is stored in the shared high-speed storage device 9, and processing is performed only in the main system. If computer switching occurs, even if a change in status cannot be detected at the time of switching, the change in status can be detected using information transmitted again after that. This retransmission of status data is automatically possible in the remote monitoring and control device master station 2, which always periodically transmits status information. Furthermore, since the remote monitoring and control device master station 2, which transmits information only when the status changes, is usually always equipped with a function to transmit all current status information, activating this function when switching computers will help the system. , a state change that could not be detected can be transmitted again and detected.

However, at the time of such computer switching, it takes about 5 seconds to several minutes to send up all status information from all locations, and therefore, the two configurations shown in Fig.
The disadvantage of the heavy computer system is that it is not possible to quickly switch computers in the event of a failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dual-system state monitoring computer device that eliminates the above-mentioned drawbacks and allows high-speed switching of computers even if an auxiliary storage device is shared.

The present invention provides state information in both the main system and the secondary system in a dual system status monitoring computer device, and when the primary system fails, the secondary system detects the final status information processed by the primary system. death,
The state change detection process is continued from the state information following the final state information using a continuous system.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dual-system status monitoring computer system of the present invention will be explained below with reference to the drawings.

FIG. 4 is an explanatory diagram showing the configuration of various data buffers and programs built in the shared high-speed storage device which is the essential part of the present invention. However, the rectangles in the figure indicate various tables, the circles indicate programs, the two solid lines indicate the flow of data when the main system is operating, and the two dotted lines indicate the flow of data when the main system is backed up. Shows the flow of data.

When the main side remote control information input program 10 receives information from the remote monitoring and control device master station (not shown), it enters this information into the remote control information manual holding table 11 and starts the status change detection program 12. This state change detection program 12 is
It operates according to a flowchart as shown in FIG.

That is, in step 102, a change in condition is detected, and if there is a change in condition, the change in condition information is registered in the condition change waiting table 13, and in step 104, the current condition table 14 is updated with new condition information. Process. The status change processing program 15 displays the status change information communicated from the status change table 13 through the input/output device 7 on a system board or CRT, or prints it on a typewriter.

On the other hand, the time-related remote control information input program 16 stores the latest several cases of input status information in the time-based remote control information input waiting table 17, in preparation for backup processing when switching from the main system. Here, if the main system electronic computer (computer) breaks down, the time system electronic computer will
The status change detection program 18 reads the last processed remote control information (information input from the remote control monitoring and control device) remaining in the remote control information input waiting table 11 from the processed pointer 19, and reads the same information remotely. The control information input waiting table 17 is searched, and based on the next remote control information of this information, the status change program 20 of the time system outputs the status information to the input/output device 7 and starts processing, and backs up the main system. Let's do it.

What is important here is that when leaving the final processing information, do not transfer the final processed remote control information to a separate table and leave it there.
The point is to leave it in the processed pointer 19. This is because the length of remote control information is not necessarily one word, but rather is usually two or more words.
If a word is transferred to another table and the main computer stops just before transferring the second word, the first word is the current information, the second word is the previous information, etc. as the final processed remote control information. This is to prevent things from remaining in your eyes if they come out.

Next, a case in which the main computer stops during processing of the status change detection program 18 will be considered. In the flowchart of FIG. 5, it is obvious that there is no problem if the process stops at point A or B.

This is because the processed pointer 19 has not been updated at this stage, so the same information is subject to chronological backup processing. Next, if it stops at point C, the current status table 14 has not been updated yet, so
Although the same condition change is registered again in the condition change table 13 depending on the timing, this is a small restriction and usually does not cause a big problem.

Next point) If the main computer stops at point D, the processed pointer 19 has not been updated yet, so the same remote control information is checked for status again in the time series, but the current status table 14 has already been updated. Therefore, it is not detected as a change in condition and is not a duplicate of change in condition. Therefore, in any case, time-related backup processing can be performed smoothly without any information leakage. Note that block 10 in FIG.
The order of 1°102.103, 104, and 105 has an important meaning. For example, if block 105 comes before any other block, if the main computer stops immediately after block 105, the processed data 19 will have been updated first, so point) A or points)
Since the assumption that the processed pointer 19 of the mind has not been updated as described in B is broken, information leakage may occur. Furthermore, in the flowchart in which blocks 103 and 104 are exchanged, if the main computer stops at point) C, the current state table 14 has already been updated, resulting in state change information being leaked. .

The overall configuration of this embodiment is the same as the conventional example shown in FIG. 3, so please refer to that.

FIG. 4 shows a configuration specific to the embodiment of the shared high-speed storage device shown in FIG.

According to this embodiment, when the main computer is stopped, the time-related computer receives the last processed remote control information of the main computer remaining in the remote control information input waiting table 11 from the processed pointer 19. The information is read out, and the same information as the read information is searched in the remote control information input waiting table 17. Since the time-related computer starts processing from the next remote control information, after switching the computers, This has the advantage that the time-based computer can immediately process status change information continuously without having to wait for all status information to be transmitted. Therefore, computers can be switched at high speed, and the status of plant equipment can be monitored without interruption in any case.

As described above, the dual-system status monitoring computer device of the present invention has the advantage that even if the auxiliary storage device is shared, computers can be switched at high speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a conventional state monitoring computer device, FIG. 2 is a block diagram showing a schematic structure of an example of a conventional dual state monitoring computer device, and FIG. 3 is a block diagram showing a schematic structure of an example of a conventional dual state monitoring computer device.
FIG. 4 is a block diagram illustrating a schematic configuration of another example of a dual-system status monitoring computer device. FIG. 5 is a block diagram showing the configuration of various data buffers and programs, and FIG. 5 is a flowchart of the state change detection program shown in FIG. 4.

Claims (1)

[Claims] 1. A main system and a stand-alone system are configured by having two interface devices each that receive status information of plant equipment and two central processing units connected to this interface device, and these two central processing In a dual-system state monitoring computer device having an auxiliary storage device and a shared storage device that are commonly connected to the device, the shared storage device includes a main system information manual time table that stores the transmitted state information; , a processed pointer that reads out the status information remaining in the holding system's information input waiting table and the main system's information input waiting table, and the information that was finally processed before the main system's central processing unit stopped. , the same information as the status information read from the pointer is searched in the table of information in the holding system, and the central processing unit of the holding system processes the next status information of the retrieved information. A dual-system state monitoring computer device characterized in that it starts a main system and backs up the main system.