Mitsubishi Electric MELSEC FX3U - Page 845

843
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.2 Step Ladder
31
FNC275-FNC279 Data Transfer 3
32
FNC280-FNC289 High Speed Processing 2
33
FNC290-FNC299 Extension File Register
34
FNC300-FNC305 FX
3U
-CF-ADP
35
SFC•STL Programming
36
Interrupt Function
37
Special Device
38
Error Code
A
Version Up Information
B
Execution Times
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
2) Parallel recombination and parallel branch
3) Selective recombination and parallel branch
STL
LD
SET
STL
LD
SET
STL
LD
SET
LD
SET
100
20
1
X000
X000
TRAN
2
X001
STL S20
SET S100
S20
X000
S100
S30
X001
S100
S100
X003
S50
X004
S60
30
3
50
60
X001
TRAN
X003
TRAN
4
X004
TRAN
Dummy state
SET S100
STL S30
X003
SET S50
STL S100
X004
SET S60
<Step ladder>
<SFC program>
<List program>
STL
STL
LD
SET
STL
LD
SET
SET
101
20
1
X000
X000
TRAN
S101
STL S20
SET S50
S20
S30
X000
S101
S101
S101
S50
S60
30
2
50
60
S101
TRAN
SET S101
STL S101
STL S30
SET S60
<Step ladder>
<SFC program>
<List program>
Dummy state
STL
LD
SET
STL
LD
SET
STL
LD
SET
SET
102
20
1
X000
S102
TRAN
2
X001
STL S20
SET S102
S20
X000
S102
S30
X001
S102
S102
S102
S40
S50
30
3
40
50
X001
TRAN
X102
TRAN
SET S102
STL S30
S102
SET S40
STL S102
SET S50
<Step ladder>
<SFC program>
<List program>
Dummy state