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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
Composition of branches/recombination and dummy state
1. When a recombination line is directly connected to a branch line without a state relay
When a recombination line is directly connected to a branch line without a state relay as shown below, it is
recommended to provide a dummy state relay between the lines.
There are no dedicated numbers for dummy state relays.
Use a state relay number not used in a program as a dummy state relay.
Dummy state
relay
20 30 40
50 60
20 30 40
50 60
20 30
40 50
20 30
40 50
20 30 40
50 60
20 30 40
50 60
20 30
40 50
20 30
40 50
Deform it
as follows.
100
Dummy state
relay
101 102 103
Dummy state
relay
Dummy
state
relay