Mitsubishi Q Series Programming Guide

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5 SFC PROGRAM PROCESSING SEQUENCE
MELSEC-Q
5.3.4 Continuous transition ON/OFF operation
There are two types of SFC program transition processing: "with continuous transition" and
"without continuous transition".
Set "with continuous transition" or "without continuous transition" using the continuous transition
bit of the SFC information devices.
When the device set to the continuous transition bit is turned ON/OFF by the user, operation is
performed as described below.
Continuous
Transition Bit
SM323 Operation
OFF
Without continuous
transition
When the transition condition is satisfied, the operation
output of the transition destination step is executed in the
next scan.
No setting
ON
With continuous
transition
When the transition condition is satisfied, the operation
output of the transition destination step is executed within
the same scan.
When the transition conditions of the steps are satisfied
continuously, the operation outputs are executed within the
same scan until the transition condition is not satisfied or
the end step is reached.
OFF ON/OFF
Without continuous
transition
When the transition condition is satisfied, the operation
output of the transition destination step is executed in the
next scan.
ON ON/OFF
With continuous
transition
When the transition condition is satisfied, the operation
output of the transition destination step is executed within
the same scan.
When the transition conditions of the steps are satisfied
continuously, the operation outputs are executed within the
same scan until the transition condition is not satisfied or
the end step is reached.
POINT
The tact time can be shortened by setting "with continuous transition".
This resolves the problem of waiting time from when the transition condition is
satisfied until the operation output of the transition destination step is executed.
However, when "with continuous transition" is set, the operations of the other
blocks and sequence program may become slower.
Refer to Section 4.5.5 for details of continuous transition.

Mitsubishi Q Series Specifications

General

Brand	Mitsubishi
Model	Q Series
Category	Control Unit
Language	English