Mitsubishi Q Series Programming Guide

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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.1 List of SFC Diagram Symbols
The symbols used in the SFC program are listed below.
Class Name
SFC Diagram
Symbol
Remarks
Initial step
0
Dummy initial step
0
Coil HOLD initial step
0
SC
Operation HOLD step (without
transition check) initial step
0
SE
Operation HOLD step (with
transition check) initial step
0
ST
Reset initial step
When step No.
is “0”
0
R
Sn
Any of these steps in 1 block
*: Initial step at top left (column 1) of
SFC diagram is fixed to No. 0.
n = reset destination step No.
Initial step
i
Dummy initial step
i
Coil HOLD initial step
i
SC
Operation HOLD step (without
transition check) initial step
i
SE
Operation HOLD step (with
transition check) initial step
i
ST
Reset initial step
When initial step
No. is other than
“0”
i
R
Sn
Up to 31 steps in 1 block.
i = step No. (1 to 511)
n = reset destination step No.
Step
i
Dummy step
i
Coil HOLD step
i
SC
Operation HOLD step (without
transition check)
i
SE
Operation HOLD step (with
transition check)
i
ST
Reset step
i
R
Sn
Block START step (with END
check)
i
Bm
Block START step (without END
check)
i
Bm
Up to 512 steps in 1 block, including
initial step
(128 steps for Basic model QCPU)
i = step No. (1 to 511)
n = reset destination step No.
m = movement destination block No.
Step
End step
Steps other than
“initial” step
More than one step can be used in
1 block.
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Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English