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7-179
CHKCIR,CHKEND
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7.10 Debugging and failure diagnosis instructions
7.10.2 Changing check format of CHK instruction (CHKCIR,CHKEND)
7.10.2
Changing check format of CHK instruction (CHKCIR,CHKEND)
CHKCIR,CHKEND
When the GX Developer is used (High Performance model QCPU/Process CPU/
Redundant CPU)
Function
CHKCIR, CHKEND
(1) 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.
(2) 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.
Remark
Refer to 7.10.1 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).
Setting
Data
Internal Devices
R, ZR
J\
U\G
Zn Constants Other
Bit Word Bit Word
–– ––
Process
High
performance
Universal
Basic
Redundant
SM400
SM400
Ladder pattern to be checked
Command
CHKS
T
CHK
CHKCIR
CHKEND
Fn
Fn
Fn
Refer to
Max. 9 coils
CHKEND
CHKST
CHK
CHKCIR
X X X X
Section
7.10.1.