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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.3 Transition
A transition is the basic unit for comprising a block, and is used by specifying a transition condition.
A transition condition is a condition for execution to proceed to the next step, and execution
proceeds to the next step when the condition is satisfied.
Table 4.2 Transition Condition Type List
Type Function Outline
Serial transition • When the transition condition is satisfied, execution proceeds from the current step to
the subsequent step.
Selection transition
(branch/coupling)
• A single step branches out into multiple transition conditions.
• Among those multiple transition conditions, execution proceeds to only the step in the
line where the transition condition is satisfied first.
Parallel transition
(branch/coupling)
• Execution simultaneously proceeds to all multiple steps that branch from a single step.
• When all steps immediately before a coupling are activated, execution proceeds to the
next step when the common transition condition is satisfied.
Jump transition • When the transition condition is satisfied, execution proceeds to the specified step in
the same block.
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