Mitsubishi Q Series Programming Guide

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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
: First five digits of serial No. are 04122 or later.
High Performance
Basic
QCPU
PLC CPU
Process
CPU
Applicable
CPU
Redundant
CPU
Universal
4.4.1 Step operation status check instructions (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\Sn
Other
Data
Type
Sequence
Program
Step
Transition
Condition
Block Step
Transition
Condition
S
Device
name
: Only step relay (S) can be used
[When step in current block is specified] [When step in another block is specified]
[When step is specified in sequence program]
aSn
bSn
& aSn
& bSn
| aSn
| bSn
aSn
bSn
& aSn
& bSn
aBLm\Sn
bBLm\Sn
& aBLm\Sn
& bBLm\Sn
| aBLm\Sn
| bBLm\Sn
aBLm\Sn
bBLm\Sn
& aBLm\Sn
& bBLm\Sn
Sn
Sn
Sn
Sn
Sn
Sn
BLm\Sn
BLm\Sn
BLm\Sn
BLm\Sn
BLm\Sn
BLm\Sn
| aBLm\Sn
| bBLm\Sn
m is a block No., n is a step No., and is a contact.
| aSn
| bSn
When expressed in a circuit When expressed in a circuit
[Functions]
(1) Checks a specified step in a specified block to determine if the step is active or inactive.
(2) The contact status changes as described below depending on whether the specified step is
inactive or active.
Contact of N/O Contact
Instruction
Contact of N/C Contact
Instruction
Inactive OFF ON
Active ON OFF

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English