Mitsubishi Electric MELSEC FX3U Programming Manual page 823

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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.
20 30
50 60
Deform it
as follows.
20 30
100 Dummy state
relay
50 60
40 20 30
50 60
40 20 30
Dummy state
101
relay
50 60
35 SFC Program and Step Ladder
40 20 30
40 50
40 20 30
Dummy
102 state
relay
40 50
35.1 SFC Program
31
32
20 30
33
40 50
34
35
20 30
Dummy state
103
relay
36
40 50
37
38
A
B
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