Mitsubishi Electric FX3G SERIES Programming Manual page 795

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4. Example of parallel recombination
Do not use MPS, MRD, MPP, ANB and ORB instructions in a program with branches and recombination.
Even in a load driving circuit, MPS instructions cannot be used immediately after STL instructions.
Pay attention to the programming order so that a branch line does not cross a recombination line.
<SFC program>
29
X010
9
50
<Step ladder>
X010 X011 X012
Before recombination, first program the drive processing of the state relays.
After that, program only the transfer processing to the recombination state relay.
5. Composition of branches and recombination
When a recombination line is directly connected to a branch line without a state relay as shown below, it is necessary
to provide a dummy state relay between the lines.
Create step ladder programs as shown below.
1) Selective recombination and selective branch
<SFC program>
20
X000
1
100 Dummy state
X003
3
50
39
Y010 Y011
X011 X012
TRAN
STL S29
Y010
STL S39
Drive
Y011 processing
STL S49
Y012
STL S29
STL S39
Transfer
processing
STL S49
SET S50
30
X001
2
TRAN TRAN
X004
4
TRAN TRAN
60
35 SFC Program and Step Ladder
49
Y012
<List program>
STL S29
OUT Y010
STL S39
OUT Y011
STL S49
OUT Y012
STL S29
STL S39
STL S49
LD X010
AND X011
AND X012
SET S50
<Step ladder>
STL S20
X000
SET S100
STL S30
X001
SET S100
STL S100
X003
SET S50
X004
SET S60
35.2 Step Ladder
31
32
33
34
35
36
37
<List program>
38
STL S20
LD X000
SET S100
STL S30
LD X001
SET S100
A
STL S100
LD X003
SET S50
LD X004
SET S60
B
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