Mitsubishi Electric MELSEC-Q Series Programming Manual page 131

■When transition destination is parallel branch
• When setting is "STOP": If any one of the transition destinations of the parallel branch is active, an error occurs and the
processing of the CPU module stops.
• When setting is "WAIT": Execution waits until all the transition destination steps of the parallel branch become inactive.
When the transition destination steps all become inactive, a transition is executed and all the first steps of the parallel
branch become active. In a WAIT status, the previous step is deactivated.
• When setting is "TRANSFER": When any one of the transition destination steps of the parallel branch is active, a transition
is executed and the previous step becomes inactive.
• When the transition destination steps are all inactive, normal transition processing is performed and all the
transition destination steps become active.
• The operation mode for transition to active step (at step double START) applies to a transition to be
executed when a transition condition is satisfied or to a forced transition set using the transition control
instruction (sTRn) of the SFC control instructions. When the step control instruction (sSn) of the SFC control
instructions is used to issue a START request to the step that is already active, the request is ignored and
the processing continues.
• For the Basic model QCPU, Universal model QCPU, and LCPU, setting of the transition to active step (at
step double START) is not allowed. The transition to active step (at step double start) is fixed to the default,
"Transition" for them.
4 SFC PROGRAM CONFIGURATION
4.7 SFC Operation Mode Setting
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