Debugging And Failure Diagnosis Instructions; Debugging And Failure Diagnosis Instructions; Special Format Failure Check - Mitsubishi Electric MELSEC-Q/L Programming Manual

7.10

Debugging and Failure Diagnosis Instructions

Special format failure check

CHKST, CHK
Basic High
Process
performance
CHKST
CHK
Setting Internal device
data
Bit
 
Processing details
■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.
When T0 is OFF,
program jumps to the
instruction next to the
CHK instruction.
7 APPLICATION INSTRUCTIONS
520

7.10 Debugging and Failure Diagnosis Instructions

Universal LCPU
Redundant
Command
R, ZR
Word
TO
X0 X2
X X X
Check condition (Only a contact is valid; b contact is ignored)
Only input (X) can be used
Up to 150 contacts can be connected
J\
Bit Word
CHKST
CHK
Y10
CHKST
X
CHK
U\G Zn Constant Others