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7 APPLICATION INSTRUCTIONS
7.10 Debugging and Failure Diagnosis Instructions
7.10 Debugging and Failure Diagnosis Instructions
Special format failure check
CHKST, CHK
■CHKST
• The CHKST instruction is the instruction that starts the CHK instruction.
• If the command for the CHKST instruction is OFF, execution jumps from the CHK instruction to the next instruction.
• If the command for the CHKST instruction is ON, the CHK instruction is executed.
Setting
data
Internal device R, ZR J\ U\G Zn Constant Others
Bit Word Bit Word
Basic
Universal
LCPU
Process
High
performance
Redundant
Command
X X X X
CHKST
CHK
Check condition (Only a contact is valid; b contact is ignored)
Up to 150 contacts can be connected
CHKST
CHK
Only input (X) can be used
X0
CHKST
X2
CHK
Y10
TO
When T0 is OFF,
program jumps to the
instruction next to the
CHK instruction.
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