Chkcir, Chkend; Changing Check Format Of Chk - Mitsubishi MELSEC-Q/L Programming Manual

CHKCIR, CHKEND

7.10.2 CHKCIR, CHKEND

Changing check format of CHK

7.10.2
CHKCIR, CHKEND
When the GX Developer is used (High Performance model QCPU/Process CPU/Redundant CPU)
CHKST
CHK
CHKCIR
CHKEND
Setting Internal Devices
Data
Bit
––
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 Page 440, Section 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).
(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.
Example
X10 in the
When corresponding to check condition X2 Processing performed by
When corresponding to check condition X8 Processing performed by
However, the order in which failure detection is executed differs depending on whether SM710 is ON or OFF.
444
Command
X X
SM400
Ladder pattern to be checked
SM400
R, ZR
Word Bit
in the figure below would be as follows:
High
Basic
performance
X X
J \
U \G
Word
––
Process LCPU
Redundant Universal
Refer to
CHKST
Page 440,
Section 7.10.1.
CHK
CHKCIR
Fn
Fn
Max. 9 coils
Fn
CHKEND
Zn Constants
X12
.....
X18
.....
Other