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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
6. It is not permitted to cross flows in SFC programs.
Change a flow on the left to a flow on the right. This change enables inverse conversion from a program on the
instruction word basis into an SFC program. (The flow on the left cannot be converted into an SFC program.)
35.1.11 Program examples
Examples of single flows
1. Example of flicker circuit
1) When the PLC mode is changed from STOP to RUN, the state relay S3 is driven by the initial pulse (M8002).
2) The state relay S3 outputs Y000. One second later, the ON status transfers to the state relay S20.
3) The state relay S20 outputs Y001. 1.5 seconds later, the ON status returns to the state relay S3.
Cross is not
allowed.
Change
1
second
1.5
seconds
Y000
Y001
20
M8002
3
1
3
Ladder block
SFC block
0
TRAN
T0
S3SET
Y000
T0
Y001
T1
TRAN
T1
K10
K15
Initial pulse