Mitsubishi Electric MELSEC-Q Series Programming Manual page 16

Program design is easy due to a wealth of step attributes
A variety of step attributes can be assigned to each step. Used singly for a given control operation, or in combination, these
attributes greatly simplify program design procedures.
■Types of HOLD steps, and their operations
• Coil HOLD step
• Operation HOLD step (no transition check)
• Operation HOLD step (with transition check)
1 GENERAL DESCRIPTION
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1.2 SFC (MELSAP-L) Features
• After transition, the operation of the operation output is continued (put in
HOLD status) and the coil output status when the transition condition is
satisfied is maintained.
• Transition will not occur if the transition condition is satisfied again.
• Convenient for maintaining an output until the corresponding block is
completed (hydraulic motor output, pass confirmation signal, etc.).
• When the output mode at block stop is OFF, it remains OFF after a block
restart.
• After transition, the operation of the operation output is continued (put in
HOLD status).
• Transition will not occur if the transition condition is satisfied again.
• When the output mode at block stop is OFF, the operation is continued after a
block restart, and therefore, the output is provided as a result of the operation
that has been performed.
• After transition, the operation of the operation output is continued (put in HOLD
status).
• When the transition condition is satisfied again, transition is executed and the
next step is reactivated.
• Operation output processing is executed at the reactivated next step. When the
transition condition is satisfied, transition occurs, and the step is deactivated.