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

7 APPLICATION INSTRUCTIONS
7.17 Program Control Instructions
725
7
Program execution status check
LDPCHK, ANDPCHK, ORPCHK
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.
Program example
• Program that keeps Y10 ON when the program file "ABC.QPG" is being executed.
(S): File name of the program whose execution status will be checked (character string)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
$
Others
Bit Word Bit Word
(S)  
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
2410 The program with the specified file name does not exist. 
Basic
Universal LCPU Process
High
performance
Redundant
LDPCHK
PCHK
ORPCHK
PCHK
ANDPCHK
PCHK
Command
Command
File name
File name
File name
PCHK
"ABC"
Y10
Execution
Non-execution