756
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
34 SFC Program and Step Ladder
34.1 SFC Program
34.1.11 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.
1
second
1.5
seconds
Y000
Y001
20
M8002
3
1
3
Ladder block
SFC block
0
TRAN
T0
S3
SET
Y000
T0
Y001
T1
TRAN
T1
K10
K15
Initial pulse