Mitsubishi Electric MELSEC FX3U Programming Manual page 845

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
5. Composition of branches and recombination
When a recombination line is directly connected to a branch line (not by way of a state relay as shown below),
it is recommended 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
2) Parallel recombination and parallel branch
<SFC program>
20
X000
1
101 Dummy state
S101
2
50
3) Selective recombination and parallel branch
<SFC program>
20
S102
1
102 Dummy state
X102
3
40
30
X001
TRAN 2 TRAN
X004
4
TRAN TRAN
60
30
TRAN
TRAN
60
30
X001
TRAN 2 TRAN
TRAN
50
35 SFC Program and Step Ladder
<Step ladder>
STL S20
X000
SET S100
STL S30
X001
SET S100
STL S100
X003
SET S50
X004
SET S60
<Step ladder>
STL S20
STL S30
X000
SET S101
STL S101
S101
SET S50
SET S60
<Step ladder>
STL S20
X000
SET S102
STL S30
X001
SET S102
STL S102
S102
SET S40
SET S50
35.2 Step Ladder
31
32
<List program>
STL S20
LD X000
SET S100
STL S30
33
LD X001
SET S100
STL S100
LD X003
SET S50
LD X004
SET S60
34
<List program>
35
STL S20
STL S30
LD X000
SET S101
STL S101
LD S101
SET S50
36
SET S60
37
<List program>
STL S20
LD X000
SET S102
38
STL S30
LD X001
SET S102
STL S102
LD S102
SET S40
SET S50
A
B
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