7-180
CHKCIR,CHKEND
(a) The device numbers indicated at check conditions (X2 and X8 in the figure below) will
assume index modification values for the individual device numbers (with the exception
of annunciators (F)) described in the ladder patterns.
X10 in the in the figure below would be as follows:
However, the order in which failure detection is executed differs depending on whether
SM710 is ON or OFF.
1) If S M710 is OFF, checks will be conducted of coil numbers 1 through the end for
each contact successively.
[Ladder designated by CHKCIR to CHKEND] [Order of check by CPU module]
2) If SM710 is ON, check s will be conducted of contact numbers 1 through the end, in
coil number order.
[Ladder designated by CHKCIR to CHKEND] [Order of check by CPU module]
When corresponding to check condition X2 Processing performed by...X12
When corresponding to check condition X8 Processing performed by...X18
Example
X2
CHKST
X8
SM400
CHK
CHKCIR
X10Z0 X12Z0 Y40Z0 X6Z0
Y5EZ0 X21Z0 Y46Z0 X1AZ0
Y5FZ0 X22Z0
SM400
CHKEND
F0
F1
F2
X8Z0
X18X1A Y48 XE
Y66 X29 Y4EX22
Y67X2A
F0
F1
F2
X10
X12 X14 Y42 X8
Y60 X23 Y48 X1C
Y61X24
F0
F1
F2
XA
Ladder
equivalent to X2
Ladder
equivalent to X8
X2
CHKST
X8
SM400
CHK
CHKCIR
SM400
CHKEND
F0
F1
F2
Y66 X29 Y4EX22
Y67X2A
F2
X12X14Y42X8
X12 X14XA
F0
F0
F1
X18X1A Y48XE
Y18X1A X10
F1
Y60 X23 Y48X1C
X61X24
F2
X10Z0 X12Z0 Y40Z0 X6Z0
Y5EZ0 X21Z0 Y46Z0 X1AZ0
Y5FZ0 X22Z0
X8Z0