JPS6252646A - Detecting device for run away of processor - Google Patents

Abstract

PURPOSE:To write a proper parameter without fail by collecting a preset parameter with the written one for a certain time when the set parameter is written in other memory areas. CONSTITUTION:The set parameter is stored in the 1st memory 1. A CPU 3 writes the parameter stored in the 1st memory 1 in the 2nd memory 2. Then the parameter in the memory 2 executes operation. Due to an interruption signal inputted at every certain interval from a timer 4, a processor 3 reads and collates the parameter in the memory 1 with the execution parameter in the memory 2. If the CPU 3 runs away and both parameters are not equal, the parameter in the memory 1 is written in the memory 2 and is corrected. When they are equal, the operation is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a runaway detection device for a processing device such as a microcomputer.

[Prior Art] In instruments such as controllers and recorders that use a processing unit (CPU) such as a microcomputer, RAM,
Parameters such as PID constants stored in one area of the ROM memory are written to another area of the memory, and the processing device is caused to perform various measurement operations based on the parameters.

[Problems to be Solved by the Invention] However, when parameters are written in another area, data different from the original data may be written due to the influence of power supply noise or radio wave noise. Executing this may result in a runaway condition.

For this reason, there is a method of resetting the parameters after a certain processing is completed, but if the processing is long, it may be difficult to reset the correct data, or if the program does not reset the parameters, the problem may be that the corrections will not be made forever.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a runaway detection device for a processing device that executes operations using correct parameters.

[Means for Solving the Problems] This invention provides a first memory that stores set parameters, a second memory into which the parameters of the first memory are written, and a second memory that is input at regular intervals. A processing device that compares the parameters of a first memory with the parameters of a second memory, and writes the parameters of the first memory to the second memory if they are different. This is a runaway detection device.

[Example 1 FIG. 1 is an explanatory diagram showing an example of the actual flow of the present invention.

In FIG. 1, setting parameters are stored in a first memory 1 such as RO~1, and at the start of operation, etc., a microcomputer-like process 9iffl (CPU > 3) stores the setting parameters in the first memory 1. is written into a second memory 2 such as a RAM. Then, the operation is executed according to the parameters of this second method. In response to the input signal, the processing device 3 reads out the setting parameters of the first memory 1 and the execution parameters of the second memory 2 and compares them.If the processing device 3 goes out of control and the two parameters do not match, the The parameters of memory 1 of '1 are written to the second memory 2 and corrected. If both parameters match, the operation continues.

These interrupt operations are repeated every time a signal from the timer 4 arrives, and operations are always performed with correct parameters.

The above operation is shown in FIG.

Note that as shown in FIG. 3, the first memory 10 has RAM
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[Effects of the Invention] As mentioned above, this invention verifies the set parameters and execution parameters at regular intervals, so operations are always executed with the correct parameters, resulting in a highly reliable device. .

[Brief explanation of drawings]

FIG. 1, FIG. 2, and FIG. 3 are explanatory diagrams showing one embodiment of the present invention.

Claims (1)

[Claims] 1. a first memory that stores set parameters;
A second memory into which the parameters of this first memory are written, and a signal inputted at regular intervals to compare the parameters of the first memory and the parameters of the second memory,
A runaway detection device for a processing device, comprising: a processing device that writes parameters of a first memory to a second memory when the parameters are different, and detects runaway of the processing device.