Mitsubishi FX3U Series Programming Manual page 754

FX /FX Series Programmable Controllers
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
50
Deform it
as follows.
20
100 Dummy state
relay
50
752
30 40 20
50
60
30 40 20
101
60 50
30 40
60
30 40
Dummy state
relay
60
34 SFC Program and Step Ladder
34.1 SFC Program
20 30 20
40 50 40
20 30 20
Dummy
102 state 103
relay
40 50 40
30
50
30
Dummy state
relay
50