Mitsubishi Electric MELSEC-Q Series Programming Manual page 73

Serial and parallel connections being mixed
When serial and parallel connections exist in the same transition condition, a serial connection "&" has priority.
Use "( )" to give a parallel connection " | " higher priority.
Ex.
Example of serial and parallel connections being mixed
Example of serial and parallel connections being mixed
aX0 | aM0 & aX1
(aX0 | aM0) & aX1
aX0 & aX1 | aM0 & aM1
aX0 & (aX1 | aM0) & aM1
Ladder example
X0
4 SFC PROGRAM CONFIGURATION
X1 M1
M0
4.3 Transition
4
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