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2-42

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 Basi

c S

tep

Subset

See for D

esc

ripti

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.

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.

CHKEND

• Ends update in ladder pattern being

checked by the CHK instruction.

CHKST

Check condition

CHK

CHKCIR

CHKEND