Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 101

Reset step [R]
Reset step [R] is a step that deactivates the specified step.
• The reset step [R] deactivates the specified step in the current block before execution of the action every scan. Except for
resetting the specified step, the reset step is the same as a normal step (without step attributes).
• When the specified step No. is S999, the HOLD steps [SC, SE, ST] that hold operations in the current block are all
deactivated. In this case, only the HOLD steps [SC, SE, ST] that hold operations can be deactivated. However, any
operation HOLD step [SE, ST] is not deactivated when operating with the state that does not hold an operation.
• The current step No. cannot be specified as specified step No.
Block start step (with END check) [BC]
Block start step (with END check) [BC] is a step that activates the specified block.
When the specified block becomes inactive and the transition becomes TRUE, the active state transitions to the next step.
(1)
(2)
The operation to be performed if multiple attempts to start one block are performed simultaneously or if an attempt to start an
already started block is performed follows the operation setting applicable to the block double start. ( Page 135 Act at
block multi-activated)
Only one block can be specified. To start multiple blocks simultaneously, use parallel branches and multiple block start steps.
■ Precautions
• An action cannot be created to the block start step (with end check) [BC].
• The block start step (with END check) [BC] cannot be created immediately before convergence of a parallel convergence.
To create the step immediately before the convergence of a parallel convergence, use a block start step (without END
check) [BS].
When this step is activated, the block start step (with END check) [BC] starts block (BL1).
BL1
No processing is performed until the execution of the start destination block (BL1) ends and
becomes inactive and the transition (2) is not checked.
When the execution of block (BL1) ends and becomes inactive, only the transition (2) check
is performed and, when the condition becomes TRUE, the transition to the next step occurs.
8 SFC PROGRAM
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8.2 Structure
8