Operation Methods For Continuous Transition - Mitsubishi Electric MELSEC-Q Series Programming Manual

6.5

Operation Methods for Continuous Transition

If "with continuous transition" is set, whether a continuous transition will be performed or not can be selected at each step
using the continuous transition disable flag (SM324).
Processing performed when continuous transition disable flag is not used
SFC Program
Processing performed when continuous transition disable flag is used
SFC Program
6 SFC PROGRAM EXECUTION
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6.5 Operation Methods for Continuous Transition
With Continuous Transition
When the corresponding block becomes active, the
processings of all steps are executed in the same scan,
and end step processing is performed to deactivate the
block.
With Continuous Transition
• When the corresponding block becomes active,
execution proceeds to step 1 since SM324 is ON.
When execution proceeds to step 1, the processing of
the first scan is ended since SM324 turns OFF.
• In the second scan, execution proceeds to step 2 since
SM324 turns ON again. When execution proceeds to
step 2, SM324 turns OFF. Since the transition
condition of step 2 does not have the contact of
SM324, a transition occurs and the end step
processing is performed to deactivate the block.
Without Continuous Transition
• When the corresponding block becomes active, steps
are executed in a 1-step-per-scan format.
• The end step processing is performed in the third scan
to deactivate the block.
Without Continuous Transition
• When the corresponding block becomes active, steps
are executed in a 1-step-per-scan format
independently of whether SM324 is present or absent.
• The end step processing is performed in the third scan
to deactivate the block.