Mitsubishi MELSEC-Q/L Programming Manual page 447

1) If SM710 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]
X8
X2
SM400
X10Z0 X12Z0 Y40Z0 X6Z0
X8Z0
Y5EZ0 X21Z0 Y46Z0 X1AZ0
Y5FZ0 X22Z0
SM400
2) If SM710 is ON, checks 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]
X2 X8
SM400
X10Z0 X12Z0 Y40Z0 X6Z0
X8Z0
Y5EZ0 X21 Z0 Y46Z0 X1AZ0
Y5FZ0 X22Z0
SM400
(b) Failure checks check the ON/OFF status of OUT F
In all check conditions, SM80 will be turned ON if even one of the OUT F
Further, the error numbers (contact numbers and coil numbers) corresponding to the OUT F
be ON will be stored from SD80 in BCD order.
(c) The instructions that can be used in ladder patterns are as follows:
Contacts......LD, LDI, AND, ANI, OR, ORI, ANB, ORB, MPS, MPP, MRD, and comparative operation instructions
Coil..............OUT F
(d) The following devices can be used for ladder pattern contacts:
Input (X), Output (Y)
(e) Only annunciators (F) can be used in ladder pattern coils.
However, since annunciators (F) are used as a dummy, any value can be set for an annunciator (F).
Further, they can overlap with no difficulties.
(f) ON/OFF controls can be performed without error if an annunciator (F) used during the execution of the CHK
instruction has the same number as an annunciator (F) used in some other context than the CHK instruction. They
will be treated differently during the CHK instruction than they are in the different context.
X12 X14 Y42 X8
CHKST
XA
CHK
Y60 X23 Y48 X1C
CHKCIR
Y61 X24
F0
X18 X1A Y48 XE
F1
X10
F2
Y66 X29 Y4E X22
Y67 X2A
CHKEND
X12 X14
CHKST
X18 X1A
CHK
X12 X14
CHKCIR
Y18 X1A
F0
Y60 X23 Y48 X1C
F1
X61 X24
F2
Y66 X29 Y4E X22
Y67 X2A
CHKEND
by using the ladder pattern in the various check conditions.
CHKCIR, CHKEND
F0
F1
Ladder
equivalent to X2
F2
F0
F1
Ladder
equivalent to X8
F2
Y42 X8
F0
Y48 XE
F0
XA
F1
X10
F1
F2
F2
is ON in a ladder pattern.
1
2
3
4
4
6
7
8
which were found to
445