Program Examples - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4) Parallel recombination and selective branch
<SFC program>
20
X000
1
103 Dummy state
X001
2
40

35.2.7 Program examples

Examples of single flows
1. Example of flicker circuit
• When the PLC mode is changed from STOP to RUN, the state relay S3 is driven by the initial pulse
(M8002).
• The state relay S3 outputs Y000. 1 second later, the ON status transfers to the state relay S20.
• The state relay S20 outputs Y001. 1.5 seconds later, the ON status returns to the state relay S3.
Y000
Y001
1
second
844
30
TRAN
X002
3
TRAN TRAN
50
Step
number
1.5
seconds
<Step ladder>
STL
STL
X000
SET
STL
X001
SET
X002
SET
<Step ladder>
M8002
SET S3
0
Initial pulse
STL S3
3
Y000
4
T0
T0
SET S20
8
STL S20
11
Y001
12
T1
T1
S3
16
RET
19
END
20
35 SFC Program and Step Ladder
35.2 Step Ladder
<List program>
STL S20
S20
STL S30
S30 LD X000
SET S103
S103
STL S103
LD X001
S103
SET S40
LD X002
S40
SET S50
S50
<List program>
Step
0 LD
number
1 SET
3 STL
4 OUT
5 OUT
8 LD
K10
9 SET
11 STL
12 OUT
13 OUT
16 LD
17 OUT
19 RET
K15
20 END
M8002
S3
S3
Y000
T0 K10
T0
S20
S20
Y001
T1 K15
T1
S3