Bit Device Output Reverse (Chk) - Mitsubishi MELSEC-A Series Programming Manual

5. SEQUENCE INSTRUCTIONS

5.3.4 Bit device output reverse (CHK)

CPU
An
AnN, AnS, AnSH, A1FX,
A0J2H, A73, A3N board
A3H, A3M
A3V, AnA,
A2C, A52G, AnU, A2AS,
QCPU-A (A Mode),
A2USH board
Bit device
X Y M
O O
(D1)
*1
*1 *1
(D2)
*1: Device used for D2 is a dummy data which has nothing to do with program processing.
The CHK instruction varies in function with I/0 control mode as shown below.
Direct mode
Failure check
Failure check
Failure check

For failure check, refer to Section 7.10.2.
Available Device
L S B F T C
O O O O
*1 *1
*1 *1 *1
Output reverse command
CHK
AnS
AnN An A1FX
Applicable
AnSH
CPU
*
x
Remark
* Valid only when the input/output control method is refresh method.
I/O control mode
(when either or both of input and output are in refresh mode)
Word (16-bit) device
D W R A0 A1 Z
*1
*1 *1 *1 *1 *1
(D1) (D2)
5 − 26
AnU, A2AS
A2USH-S1
A3H
A3V AnA A2USH board
A3M
QCPU-A
(A Mode)
O x x x x
Refresh mode

Bit device output reverse
Failure check
Failure check
Constant Pointer Level
V K H P I N
K1
*1
to
K4
Setting data
(D1) Required device number
Dummy data
(D2)
Any device number
indicated by
MELSEC-A
A2C A3N
A0J2H A73
A52G boad
* * *
x
M9012 (M9010, M9011)