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
4.4.10 Active step change instruction (SCHG)
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
Expansion
SFC
Other
Data
Type
Sequence
Program
Step
Transition
Condition
Block Step
Transition
Condition
D
BIN16
SCHG
D
[Function]
(1) Deactivates the step that executed an instruction, and forcibly activates the specified step (set
with the device designated by
D
) in the same block.
(2) When the destination step is already active, the step that executed the SCHG instruction is
deactivated and the destination step continues processing as-is.
(3) The step where this instruction is executed is deactivated when processing proceeds to the
transition condition status check following the completion of that step's program operation.
(4) This instruction can only be used at SFC program steps.
[Operation Error]
• Error No.4631 occurs when the specified destination step does not exist.
• Error No.4001 occurs when this instruction is used at a sequence program other than an
SFC program (error is activated on switching from STOP to RUN).
[Program Examples]
(1) The following program causes a transition as-is when X10 has turned ON before X1 turns ON,
and deactivates step 5 and activates step 6 when X1 has turned ON before X10 turns ON.
SCHG K6
aX10 aX1
S6
S5
The program created with MELSAP3 is as shown below.
S5
S6
X10
Tran
X1
SCHG K6

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English