Program Execution Status Check - Mitsubishi Electric MELSEC-Q/L Programming Manual

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Program execution status check

LDPCHK, ANDPCHK, ORPCHK

(S): File name of the program whose execution status will be checked (character string)

Internal device

Processing details

• Checks whether the program of the specified file name is in execution or not (non-execution).

• The instruction is in conduction when the program of the specified file name is in execution, and the instruction is in non-

conduction when the program is in non-execution.

• Specify the file name without an extension (.QPG). For example, specify "ABC" when the file name is ABC.QPG.

• Non-execution indicates that the program execution type is a stand-by type. Execution indicates that the program execution

type is a scan execution type (including during output OFF (during non-execution processing)), low speed execution type or

fixed scan execution type.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns on, and an error code is stored in SD0.

Error details

The program with the specified file name does not exist.

Program example

• Program that keeps Y10 ON when the program file "ABC.QPG" is being executed.

Non-execution

7 APPLICATION INSTRUCTIONS

7.17 Program Control Instructions