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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.2.7 Reset step
R
A reset step is a step which designates a forced deactivation of another specified step (operation
output).
The reset step deactivates the designated step in the current block before execution of the
operation output every scan.
Except the deactivation of the specified step, the reset step execute the operation output with the
same functions as a normal step (without step attributes).
When a reset step is
activated, a specified
step is deactivated
(reset).
R
n
Sn
(1) When deactivating only the designated step
Set the step number to be deactivated to the specified step number Sn.
(2) When deactivating all the held steps
Set "999" to the specified step number Sn.
When the number of the specified step is "999", all held steps of the coil HOLD steps,
operation HOLD steps (without transition check) and operation HOLD steps (with transition
check) in the current block are batch-deactivated.
POINT
(1) Only held steps can be deactivated by the reset step.
The following steps are not the targets of the reset step.
• HOLD steps that are active but not held
• Steps that are not specified as the HOLD steps
(2)
The Basic model QCPU and the Universal model QCPU cannot set own step as a
reset step.
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