524
7 APPLICATION INSTRUCTIONS
7.10 Debugging and Failure Diagnosis Instructions
Changing check format of CHK
CHKCIR, CHKEND
• The check ladder pattern that will be used in the CHK instruction can be updated to any format desired. The actual failure
checks are conducted with the CHKST and CHK instructions.
• Failure checks are conducted according to the check conditions designated by the CHK instruction and the ladder pattern
described between the CHKCIR and CHKEND instructions.
• Refer to Page 520 Special format failure check for more information on the CHKST and CHK instructions.
• To change the check format of the CHK instruction using the CHKCIR to CHKEND instructions, the user
should create a ladder with index modification (Z0).
(1) Page 520 Special format failure check
Setting
data
Internal device R, ZR J\ U\G Zn Constant Others
Bit Word Bit Word
Basic
Universal
LCPU
Process
High
performance
Redundant
SM400
SM400
CHKST
CHK
CHKCIR
CHKEND
Fn
Fn
Fn
CHKEND
CHKST
CHK
CHKCIR
X X X X
(1)
Ladder pattern to be checked
Max. 9 coils
Command
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