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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
(3) An operation HOLD step (with transition check) becomes inactive when any of the following
occur:
(a) When the end step of the corresponding block is executed. (Except when SM327 is ON)
(b) When an SFC control instruction (rBLm) designates a forced END at the block in question.
(c) When an SFC control instruction (rBLm\Sn, rSn) designates a reset at the block in question.
(d) When a reset occurs at the device designated as the SFC information register's block
START/END device.
(e) When a reset step for resetting the step in question becomes active.
(f) When "S999" is designated at the reset step in the same block.
(g) When the SFC START/STOP command (SM321) is switched OFF.
(4) Block STOP processing
Make a block STOP using the STOP/RESTART bit of the SFC information devices or the
block STOP instruction of the SFC control instructions.
The processing of the active step in the block where a block STOP was made is as described
below.
(a) When the "block STOP-time operation output flag (SM325)" is OFF (coil output OFF)
The step becomes inactive when the processing of the corresponding block is performed
first after a block STOP request.
• All coil outputs turn OFF.
• However, the coils turned ON by the SET instruction remain ON.
(b) When the "block STOP-time operation output flag (SM325)" is ON (coil output held)
The coil outputs remain ON during a block STOP and after a block RESTART.
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