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2.5.10 Debugging and failure diagnosis instructions
Table 2.27 Debugging and Failure Diagnosis Instructions
Category
Instruction Symbol
Symbol Processing Details
Execution
Condition
Number of Basic Steps
Subset
See for Description
Checks
CHKST
• The CHK instruction is executed when
CHKST is executable.
• Jumps to the step following the CHK
instruction when CHKST is in a
non-executable status.
1 - 7-175
CHK
• During normal conditions SM80 : OFF,
SD80 : 0
• During abnormal conditions SM80
: ON,
SD80
: Failure No.
CHKCIR
• Starts update in ladder pattern being
checked by the CHK instruction.
1 - 7-179
CHKEND
• Ends update in ladder pattern being
checked by the CHK instruction.
CHKST
Check condition
CHK
CHKCIR
CHKEND