Mitsubishi Q Series Programming Guide

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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
High Performance
Basic
QCPU
PLC CPU
Process
CPU
Applicable
CPU
Redundant
CPU
Universal
4.4.2 Forced transition check instruction (a, b, &a, &b, la, lb)
Usable Devices Programs Using Instructions Execution Site
Internal Device
(System, User)
Link Direct
J
\
SFC Program
Bit Word
File
Register
R
Bit Word
Intelligent
Function
Module
U
\G
Index
Z
Constant
K, H
Expansion
SFC
BLm/TRn
Other
TRn
Data
Type
Sequence
Program
Step
Transition
Condition
Block Step
Transition
Condition
S
Device
name
[When step in current block is specified] [When step in another block is specified]
[When step is specified in sequence program]
aTRn
bTRn
& aTRn
& bTRn
| aTRn
| bTRn
aTRn
bTRn
& aTRn
& bTRn
aBLm\TRn
bBLm\TRn
& aBLm\TRn
& bBLm\TRn
| aBLm\TRn
| bBLm\TRn
aBLm\TRn
bBLm\TRn
& aBLm\TRn
& bBLm\TRn
TRn
TRn
TRn
TRn
TRn
TRn
BLm\TRn
BLm\
TRn
BLm\
TRn
BLm\Sn
BLm\
TRn
BLm\
TR
n
| aBLm\TRn
| bBLm\TRn
| aTRn
| bTRn
When expressed in a circui
t
When expressed in a circui
t
m is a block No., n is a transition condition No., and is a contact.
[Function]
(1) Checks whether or not the specified transition condition of the specified block is specified for
forced transition by the forced transition EXECUTE instruction (SET BLm\TRn).
(2) The contact status changes as described below depending on whether the specified transition
condition is specified for a forced transition or not.
Contact of N/O Contact
Instruction
Contact of N/C Contact
Instruction
When specified for forced
transition
ON OFF
When not specified for forced
transition
OFF ON

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English