Debugging And Failure Diagnosis Instructions - Mitsubishi MELSEC Q Series Programming Manual

2.5.10

Debugging and failure diagnosis instructions

Category
CHKST
Checks
CHK
Check condition
CHKCIR
CHKEND
2-42
Table 2.27 Debugging and Failure Diagnosis Instructions
Symbol
• The CHK instruction is executed when
CHKST is executable.
• Jumps to the step following the CHK
CHKST
instruction when CHKST is in a
non-executable status.
• During normal conditions
SD80 : 0
CHK
• During abnormal conditions
SD80 : Failure No.
• Starts update in ladder pattern being
CHKCIR
checked by the CHK instruction.
• Ends update in ladder pattern being
CHKEND
checked by the CHK instruction.
Processing Details
SM80 : OFF,
SM80 : ON,
Execution
Condition
1 - 7-174
1 - 7-178