Mitsubishi Electric MELSEC FX3U - Program Examples

844
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.2 Step Ladder
4) Parallel recombination and selective branch
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.
<List program>
STL
STL
LD
SET
STL
LD
SET
LD
SET
103
20
1
X000
TRAN
X000
STL S20
SET S103
S20
S30
X000
S103
S103
X001
S40
X002
S50
30
2
40
50
X001
TRAN
3
X002
TRAN
STL S30
X001
SET S40
STL S103
X002
SET S50
<Step ladder>
<SFC program>
Dummy state
1
second
1.5
seconds
Y000
Y001
LD
SET
STL
OUT
OUT
LD
SET
STL
OUT
OUT
LD
OUT
RET
END
SET S3
M8002
S3
S3
Y000
T0 K10
T0
S20
S20
Y001
T1 K15
T1
S3
STL S3
T0
STL S20
SET S20
M8002
Y000
K10
T0
T1
RET
Y001
K15
T1
END
0
1
3
4
5
8
9
11
12
13
16
17
19
20
Step
number
0
3
4
8
11
12
16
19
20
Initial pulse
S3
<List program><Step ladder>
Step
number