Mitsubishi Q Series Programming Guide

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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.5.3 Block STOP/RESTART bit
The block STOP/RESTART bit is used to temporarily stop processing while the corresponding
block is active.
(1) When the designated block STOP/RESTART bit is switched ON by the sequence program or
peripheral device, processing will be stopped at the current step of the block in question.
If a START status is in effect at another block, the STOP will still occur, but the START
destination block will remain active and processing will continue.
To stop the START destination block at the same time, the START destination's block
STOP/RESTART bit must also be switched OFF.
(2) When a block is stopped by switching the block STOP/RESTART bit ON, the STOP timing will
be as shown below.
Operation
Held step *
Setting of
Output Mode at
Block Stop in
PLC Parameter
Operation
Output at
Block Stop
(SM325)
Status of
STOP-time
Mode Bit
Active step other than held step
(including HOLD step whose transition condition
is not satisfied)
Coil HOLD step (SC)
Operation HOLD
step (without
transition check) (SE)
Operation HOLD
step (with transition
check) (ST)
OFF or no
setting
(immediate
stop)
• Immediately after a STOP request is made,
the coil output of the operation output is turned
OFF and the block is stopped.
• The status remains active.
• Turns OFF
(coil output
OFF)
• Remains ON
(coil output
held)
• OFF
(coil
output
OFF)
ON
(STOP after
transition)
• Normal operation is performed until the
transition condition is satisfied.
• When the transition condition is satisfied, the
end processing of the corresponding step is
performed.
At the same time, the transition destination
step becomes active and the block stops
immediately.
• Immediately after a
STOP request is
made, the coil
output of the
operation output is
turned OFF and the
block is stopped.
• The status
becomes inactive.
• Immediately after a STOP request is
made, the coil output of the operation
output is turned OFF and the block is
stopped.
• The status remains active.
OFF or no
setting
(immediate
stop)
• Immediately after a STOP request is made,
the block is stopped with the coil output of the
operation output being held.
• The status remains active.
• Remains ON
(coil output
held)
• ON
(coil
output
held)
ON
(STOP after
transition)
• Normal operation is performed until the
transition condition is satisfied.
• When the transition condition is satisfied, the
end processing of the corresponding step is
performed.
At the same time, the transition destination
step becomes active and the block stops
immediately.
• Immediately after a STOP request is made, the block is stopped
with the coil output of the operation output being held.
• The status remains active.
*: The held step indicates the step whose attribute has been set to the HOLD step (SC, SE, ST) and which is being held with the
transition condition satisfied.

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English