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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.2 Step Ladder
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.
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