JPH02276317A - Redundant system switching method - Google Patents

Abstract

PURPOSE:To accurately recognize the state of a redundant system by discriminating the content of a state signal sent from a system by a redundant system switching device, and discriminating and displaying the state of each system at which state, an operating state, a state as a spare system, a state performing maintenance, or a state where a fault occurs, each system is set. CONSTITUTION:When a first redundant system 2 is set at a maintenance state to apply maintenance, system deciding logic 4 detects a maintenance signal 7 for first redundant system 2, and changes the state display of the first redundant system 2 from the one in current use to the one of maintenance on a display panel 8. When the setting of maintenance on the first redundant system 2 is released, the state display for the first redundant system 2 being displayed on the display panel 8 is changed from the one of maintenance to spare one, and the state display for a second redundant system 3 remains unchanged. Thus, the state of each system is displayed on the display panel 8 provided at a redundant system switching device side. In such a way, the redundant system switching device 1 can always perform accurate switching control by performing the switching control of each system based on the content displayed on the display panel 8.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a redundant system switching system, and more particularly to a redundant system switching system that allows a redundant system switching device to accurately know the device status of each system.

[Conventional technology]

FIG. 2 is a block diagram showing a redundant system controlled by a conventional redundant system switching method. In the figure, ■ is a redundant system switching device, 2 is a first redundant system, It is connected to the. Reference numeral 2 denotes a second redundant system, which, like the first redundant system 2, is connected to the redundant switching device 1. FIG. 3 is a circuit diagram showing the internal configuration of the redundant system switching device 1 shown in FIG. 2. In the figure, 4 indicates system determination, ``When a system is sick and is notified that a failure has occurred, a process is performed to determine a new system to operate in order to deal with the failure; is transmitted through a signal line connected between the first redundant system 2 and the system determination logic 4,
The online signal 5a for the first redundant system is sent from the system determination logic 4 to the first redundant system 2 via a signal line connected between the second redundant system 3 and the system determination logic 4. An online signal 6 for the second redundant system is sent from the system determination logic 4 to the second redundant system 3 via a signal line connected between the first redundant system 2 and the system determination logic 4, First redundant system 2
A failure signal 6a for the first redundant system is sent from the system determination logic 4 to the system determination logic 4 through a signal line connected between the second redundant system 3 and the system determination logic 4. This is a failure signal for the second redundant system that is sent from the system determination logic 4 to the system determination logic 4. Next, the operation will be explained. First, the case where the active system is switched from the first redundant system 2 to the second redundant system 3 will be described. When a failure occurs due to some cause in the first redundant system 2 which is currently operating as an active system, the first redundant system 2 detects the occurrence of the failure and generates a failure signal 6. In this way, the fault signal 6 for the first redundant system 2 generated from the first redundant system 2 is transmitted between the first redundant system 2 and the system determination logic 4 in the redundant system switching device l. The system decision logic 4 is notified by being supplied via the connected signal line. In the redundant system switching device 1, the system determination logic 4
When the fault signal 6 for the redundant system 2 is received, a system other than the first redundant system 2 that can be used as an active system, that is, a system in a standby state is selected by 2τ. In this case, since the second redundant system 3 is in reserve, the system determination logic 4 instructs system switching to the second redundant system 3. Here, when switching the active system from the first redundant system 2 to the second redundant system 3, the system determination logic 4 supplies the online signal 5 to the first redundant system 2, thereby transmitting the online signal. to stop. Next, by supplying the online signal 5a to the second redundant system 3, various controls are performed to operate the second redundant system 3 as the active system, thereby starting to send out the online signal. By performing such processing, the first redundant system 2 to the second redundant system 3
This occurs every time the active system is switched to .

[Problem to be solved by the invention]

Since the conventional redundant system switching system is configured as described above, the first. Even if the second redundant system is not faulty,
A fault signal is generated during maintenance or the like. In the self-redundant system that generated the fault signal, the cause of the fault signal is quickly determined, but on the redundant system switching device side, the fault signal is caused by the first. It is impossible to determine whether the problem is due to a failure in the second redundant system or due to maintenance work, and as a result, there is a problem in that the redundant system is switched incorrectly. This invention was made in order to solve the above-mentioned problems, and provides a redundant system switching method that allows the redundant system switching device to accurately know the status of the first and second redundant systems. With the goal.

[Means to solve the problem]

The redundant system switching method according to the present invention generates a status signal indicating the status of each device in each system and supplies it to the redundant system switching device side, and the redundant system switching device receives the content of the status signal sent from this system. By determining whether each system is in operation or in reserve. It determines and displays the status, such as under maintenance or failure.

[Effect]

The redundant system switching method in this invention allows each system to
Since a status signal indicating its own status is generated and supplied to the redundant system switching device side, the redundant system switching device side can accurately grasp the current status of each system by determining the contents of this status signal. This makes it possible to switch redundant systems accurately.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 7 is a maintenance signal for the first redundant system as a status signal generated when the first redundant system 2 is in the maintenance state, and connects the first redundant system 2 and the system determination logic 4. It is supplied to the system determination logic 4 via wiring. 7a is a maintenance signal for the second redundant system as a status signal generated when the second redundant system 3 is in the maintenance state, and is transmitted through the wiring connecting the second redundant system 3 and the system determination logic 4. It is supplied to the system decision port 4. Reference numeral 8 denotes a display panel connected to the system decision logic 4, which displays an online signal 5.5a and fault signals 6, 6a.
Accordingly, the system is configured to display the status of the first or second redundant system determined by the system determination logic 4. 1 differs greatly from FIG. 3 in that maintenance signals 7, 7a are supplied from each system to the system determination logic 4, and that a display panel 8 is provided. Next, the operation will be explained. First, it is assumed that the first redundant system 2 is operated as the active system and the second redundant system 3 is in the standby state. Here, when the first redundant system 2 is set to a maintenance state for maintenance, a maintenance signal 7 as a status signal is generated from the first full-length system 2, and the maintenance signal 7 is generated as a status signal. It is supplied to the system decision logic 4. When the system determination logic 4 detects the maintenance signal 7 for the first redundant system 2, it changes the status display of the first redundant system 2 from active to maintenance on the display panel 8, and also changes the status display of the first redundant system 2 from active to maintenance. Change the status display of 3 from standby to active. Further, the system determination logic 4 is configured to control the system from the first redundant system 2 to the second redundant system 3.
By supplying the online signal 5 to the first redundant system 2 to stop sending out the online signal, and by supplying the online signal 5a to the second redundant system 3, Start sending online signals. Next, maintenance on the first redundant system 2 is completed,
When the maintenance setting for the first redundant system 2 is canceled, the transmission of the maintenance signal 7 that has been output from the first redundant system 2 is stopped. When the system determination logic 4 detects that the transmission of the maintenance mail 7 has been stopped, it changes the status display for the first redundant system 2 displayed on the display panel 8 from maintenance to standby, and The status display for the system 3 remains as is.In other words, the system determination logic 4 sets the second redundant system 3 as the active system without switching the redundant system unless the fault signal 6a is sent from the second redundant system 3. Continue to use. Therefore, in the redundant system switching system configured as described above, the status of each system is displayed on the display panel 8 provided on the redundant system switching device 1 side. Therefore, the redundant system switching device 1 can always perform accurate switching control by controlling switching of each system based on the display contents of the display panel 8. In addition, in the above embodiment, four states (
We have only explained the case where the display (operation, backup, maintenance, fault) is displayed on the display panel installed in the redundant system switching device, but by supplying this status signal to other systems, each prefecture can It goes without saying that the state of the system may also be displayed.

【Effect of the invention】

As described above, according to the present invention, the redundant system switching method generates a status signal indicating the status of each device in each system and supplies it to the redundant system switching device side, and the redundant system switching device receives the signal sent from this system. By determining the contents of the status signals that come in, the system can determine and display the status of each system, such as operating, standby, under maintenance, or a failure has occurred, so the redundant system switching equipment side can check the status of each prefecture. This has the effect that even if a fault signal is generated in each prefecture due to conditions other than faults such as maintenance, the redundant system switching equipment can respond accurately. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the redundant system switching method according to the present invention, FIG. 2 is a block diagram for explaining the conventional redundant system switching method, and FIG. FIG. 2 is a block diagram showing a specific example of a system switching device. 1 is a redundant system switching device, 2 is a first redundant system, 3 is a second redundant system, 4 is a system determination logic, 5.5a is an online signal, 6 and 6a are fault signals, 7.7a is a maintenance signal ( In the figures, the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] In a redundant system in which redundant switching is performed by connecting a plurality of systems via a redundant switching device, each system sends a status signal indicating its own status, and the redundant switching device A redundant system switching method characterized by displaying the status of each system on a display panel by determining the contents of status signals.