JPH04177504A - Backup device of programmable controller - Google Patents

Abstract

PURPOSE:To improve the processing capacity of debug/simulation of a system, and the reliability by executing the simulation by a programmable controller of a holding system even in the course of operation of a programmable controller of an operating system. CONSTITUTION:A CPU 1 and a program memory 3 constitute a programmable controller (operating system PC) of an operating system operated at a regular time. On the other hand, when abnormality is generated in the operating system PC, a holding system PC for backing it up is provided with a CPU 15 and a program memory(PM) 15 and connected to a bus switching circuit 7 through a system bus 17. In such a state, in a bus switching control circuit l9, the switching control is executed by a healthy signal 21 from the CPU 1 of the operating system PC and a healthy signal 23 from the CPU 13 of the holding system PC. In such a way, even in the course of the operating system PC, the processing of simulation and debug is executed by the PC of the holding system, and the processing efficiency of the simulation, etc., is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Application Field) The present invention comprises an active programmable controller and a standby programmable controller, and when an abnormality occurs in the active programmable controller, the standby Among backup devices for a programmable controller that switches control to a system programmable controller, the present invention particularly relates to a programmable controller backup device that allows a standby programmable controller to execute simulation control while the active programmable controller is in operation.

(Prior Art) The general configuration of the pack-in device for the programmable controller described above will be described with reference to FIG. 2.

The CPU 1B and program memory 3B (PM) are an active programmable controller (hereinafter referred to as an active PC).
That's what it means. ), and the CPU 35 and program memory 37 (PM) constitute a standby programmable controller (hereinafter referred to as standby PC). Normally, the active PC is connected to the input/output device 41 via the bus switching device 39, and the system is controlled by a program stored in the program memory 33.

When an abnormality occurs in the operating PC, the bus switching device 39
Then, the system bus 43 on the active PC side is switched to the system bus 45 on the standby PC side, the standby PC is connected to the input/output device 41, and control by the standby PC is executed.

Next, the bus switching device 39 will be explained using FIG. 3.

The bus switching device 39 includes a bus switching control circuit 53 and a bus switching circuit 55 that is switched under the control of the bus switching control circuit 53.

Normally, the system bus 43 of the active PC is connected to the input/output device 41 within the bus switching circuit 55, and the active PC is connected to the input/output device 41 within the bus switching circuit 55.
control is executed.

Here, for example, if an abnormality occurs in the CPU 31 of the active PC and the healthy signal 47 from the CPU 31 becomes inactive, the bus switching control circuit 53 controls the CPU 31 of the standby PC.
On condition that the healthy signal 49 of the PU 35 is active, the bus switching circuit 55 is switched to the system bus 45 and control is switched to the standby PC. By switching,
The CPU 35 of the standby PC is connected to the input/output device 41 via the system bus 45, and control by the standby PC is executed by the program stored in the program memory 37, thereby putting the programmable controller in a backup state. In the backup state, it is not easy to depack the system, and it is not possible to perform simulations or the like using the standby PC while the active PC is in operation.

(Problem to be Solved by the Invention) By the way, conventional backup devices for programmable controllers do not stop the system when depacking or simulating the system for system modification etc. after the system is started up. , working PC
Since simulations and the like are executed on the side, there is a risk that system processing may be delayed and the reliability of the system may be reduced due to a reduction in processing efficiency, and a countermeasure against this problem has been desperately needed.

The present invention has been made in view of the above, and its purpose is to improve system depacking and simulation processing capacity by executing simulations with a standby programmable controller even when the active programmable controller is in operation. Therefore, it is an object of the present invention to provide a backup device for a programmable controller that improves the reliability of the device.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a simulation memory that stores simulations executed by an active programmable controller and a standby programmable controller; Switching the simulation memory to control the standby programmable controller while the active programmable controller is in operation, and switching the simulation memory to control the active programmable controller when an abnormality occurs in the active programmable controller. The gist is that it is equipped with a control means, and.

(A backup device for a programmable controller with the above configuration stores a simulation program executed by the active programmable controller and the standby programmable controller while the active programmable controller is in operation.) The simulation memory is switched to the control of the standby programmable controller.On the other hand, if an error occurs in the active programmable controller, the simulation memory is switched to the control of the active programmable controller, improving system depacking and simulation processing efficiency. .

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing control of an embodiment of the programmable controller of the present invention.

In the programmable controller backup device, the CPUI and program memory (PM) 3 are connected to an input/output device 9 via a system bus 5 by a bus switching circuit 7. The CPUI and program memory 3 constitute an active programmable controller (hereinafter referred to as an active PC) that operates normally.

On the other hand, if an abnormality occurs in the operating system PC, the operating system P
A standby programmable controller (hereinafter referred to as a standby PC) that backs up the CPU 13 and a program memory (PM) 15 is connected to the bus switching circuit 7 via a system bus 17.

The bus switching control circuit 19 performs switching control using a healthy signal 21 from the CPU 1 of the active PC and a healthy signal 23 from the CPU 1B of the standby PC. That is, when an abnormality occurs in the active PC and the healthy signal 21 becomes inactive, the bus switching control circuit 19 switches the bus switching circuit 7 to the standby PC on the condition that the healthy signal of the CPU 1B of the standby PC becomes active. Switch to the side system bus 17.

The simulation memory 25 is a memory that stores a simulation program for a mock experiment using a physical or logical model. The simulation memory 25 is switched via the system bus 27 to the system bus 5 on the active PC side or the system bus 17 on the standby PC side by a backup simulation switching circuit 29.

The backup simulation switching circuit 29 is
A switching command signal from the bus switching control circuit 19 switches the simulation memory 25 to the system bus 5 on the active PC side or the system bus 17 on the standby PC side.

Therefore, when the CPU of the active PC is connected to the input/output device 9 and is in control operation, the simulation memory 25 is switched to the system bus 17 of the standby PC in response to a switching command signal from the bus switching control circuit 19. By switching, the standby PC uses the simulation memory 25.
Simulations can be executed independently of the operating PC using programs stored in the computer itself.

Next, the operation of this embodiment will be explained.

First, the system starts up and the backup switching circuit 7 is switched to the active PC side, and the CP on the active PC side is switched.
The UI executes control via the input/output device 9. During the control operation of the active PC, the backup simulation switching circuit 29 transfers the simulation memory 25 to the standby PC in response to a switching command signal from the bus switching control circuit 19.
Switch to system bus 17 on the C side. By switching, CPUI:3 of standby PC becomes simulation memory 2.
The simulation is executed according to the simulation program stored in 5. Also, the C of the standby PC
PU1B can also execute system depacking.

Next, an error occurred in the CPU of the operating PC and the CPU
When the healthy signal 21 becomes inactive, the bus switching control circuit 19 switches the bus switching circuit 7 to the system bus 17 on the standby PC side on the condition that the healthy signal 23 is active. Further, the bus switching control circuit 19 is connected to the backup simulation switching circuit 2.
9 to switch the simulation memory 25 to the system bus 5 on the active PC side.

This allows the standby programmable controller to perform simulation and depack processing even when the active programmable controller is in operation, thereby improving the processing efficiency of simulations and the like.

[Effects of the Invention] As explained above, according to the present invention, simulation can be executed by the standby programmable controller even when the active programmable controller is in operation, thereby improving system depacking and simulation processing capacity. It is possible to improve the reliability of the device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a backup device for a programmable controller of the present invention, FIG. 2 is a block diagram showing a general configuration of a backup device for a programmable controller, and FIG. 3 is a backup switching device. It is a block diagram. 1.13...CPU 3.15...Program memory 17...Bus switching circuit 19...Bus switching control circuit 25...Simulation memory 29...Backup simulation switching circuit ゛Representative Patent Attorney Miyoshi Hidekazu Figure 1 (operating system) (Standby system) Figure 2

Claims (1)

[Scope of Claims] A backup device for a programmable controller comprising an active programmable controller and a standby programmable controller, and switching control to the standby programmable controller when an abnormality occurs in the active programmable controller, comprising: a simulation memory that stores simulations executed by a system programmable controller and a standby system programmable controller; and a simulation memory that stores simulations executed by a system programmable controller and a standby system programmable controller; A backup device for a programmable controller, comprising: switching control means for switching the simulation memory to control of the active programmable controller when an abnormality occurs in the active programmable controller.