JPH03147101A - Control system with erroneous control prevention - Google Patents

Abstract

PURPOSE:To prevent the abnormality of a control package from exerting the influence on a main function of a device by transferring the abnormality of the control package to a package group and making a control signal invalid at the time of generating abnormality of the control package in each package to be controlled. CONSTITUTION:A control package 10 transmits a control signal (a) and a control package abnormality signal (b), and a control bus 40 transfers the control signal (b) to a package 20 to be controlled. The package 20 to be controlled performs an intrinsic function in accordance with the control signal (a), and a signal line 50 transfers the control package abnormality signal (b) to the package 20 to be controlled. In the package 20 to be controlled, a detecting circuit 22 detects the control package abnormality signal (b), and when a gate control signal (d) is generated to a gate circuit 21, when the gate signal (d) is significant, a gate is closed so that the control signal (a) is not transferred to a main circuit 23. In such a way, it is possible to prevent abnormality of the control package 10 from exerting the influence on a main function of a device.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control method with prevention of erroneous control, and particularly relates to a control method with prevention of erroneous control in a control device equipped with a group of controlled packages and a package that controls the same. .

[Conventional technology]

Conventionally, the control system for this type of device has a self-diagnosis means for the control package and a function to issue an alarm to the outside. It does not have a function to prevent erroneous control of the package group and prevent it from affecting the main functions of the device.

[Problem to be solved by the invention]

The conventional control method described above has a self-diagnosis means for the control package, but when there is an abnormality in the control package such as a runaway of the processor, the control package incorrectly controls the group of controlled packages, paralyzing the main functions of the device. The problem is that it cannot be prevented.

[Means to solve the problem]

The control method of the present invention includes a control package equipped with a control processor, a control bus for transmitting control signals sent by the control package, and an abnormality of the control package detected by a self-diagnosis means of the control package. at least one gate means connected to the control package via the control bus and the signal line for disabling the control signal when the abnormal signal is received; A controlled package is provided.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. In the figure, reference number 10 is a control package, 20 is a controlled package, 40 is a control bus, 50 is a signal line for transmitting a control package error, a is a control signal, and b is a control package error signal, respectively. The control package 10 emits a control signal a and a control package abnormality signal. Control bus 40 transmits control signal a to controlled package 20 . The controlled package 20 performs a specific function depending on the control signal a. The signal line 50 transmits a control package abnormality signal to the controlled package 20.

FIG. 2 is a block diagram showing an example of the configuration of the control package 10. As shown in FIG. Reference number 11 is a processor, 12 is a WDT (
watchdog timer) circuit, C indicates the WDT reset signal. Processor 11 generates control signal a and also W
DT circuit 12 issues WDT reset signal C. WDT
The circuit 12 monitors the operation of the processor 11 by VDT, and issues a control package abnormality signal upon timeout.

FIG. 3 is a block diagram showing an example of the configuration of the controlled package 20. As shown in FIG. Reference number 21 is a gate circuit for control signal a, 2
2 is a control package abnormality signal detection circuit, 23 is a main circuit that performs a specific function of the controlled circuit 20, and d is a gate control signal. The detection circuit 22 outputs a control package abnormality signal bt! - Detects and issues a gate control signal d to the gate circuit 821 when the control package abnormality signal is significant. The gate circuit 21 transmits the control signal a to the main circuit 23 when the gate signal d is not significant, and closes the gate to prevent the control signal a from being transmitted to the main circuit 23 when the gate signal d is significant.

Therefore, when the control package 10 is abnormal, the group of controlled packages 20 is not controlled. Therefore, the main function of the device is maintained in the state before the abnormality of the control package 10 occurred, and the main function of the device is This can be done without affecting functionality.

〔Effect of the invention〕

As explained above, the present invention transmits the abnormality of the control package to the package group, and disables the control signal in each controlled package when the control package is abnormal.
This prevents the control package from erroneously controlling a group of controlled packages in the event of a control package abnormality such as a runaway processor, keeps the main function of the device in the state before the control package abnormality, and prevents the control package from returning to the main function of the device when the control package abnormality occurs. There is an effect that can prevent it from affecting you.

[Brief explanation of the drawing]

1 through 3 are block diagrams of embodiments of the present invention. DESCRIPTION OF SYMBOLS 10... Control package, 20... Controlled package, 40... Control bus, 50... Signal line, 11...
- Processor, 12...WDT (watchdog timer) circuit, 21... Gate circuit, 22... Detection circuit, 23. Main circuit.

Claims (1)

[Claims] A control package equipped with a control processor, a control bus for transmitting control signals sent by the control package, and a signal for transmitting an abnormality signal indicating an abnormality in the control package detected by a self-diagnosis means of the control package. at least one controlled package connected to the control package via the control bus and the signal line and each having gate means for disabling the control signal upon receipt of the abnormal signal. A control system that prevents erroneous control.