Continuous Transition On/Off Operation - Mitsubishi MELSEC-Q Series Programming Manual

5 SFC PROGRAM PROCESSING SEQUENCE

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
No setting
OFF
ON
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SM323
Without continuous
OFF
transition
With continuous
ON
transition
Without continuous
ON/OFF
transition
With continuous
ON/OFF
transition
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.
Operation
When the transition condition is satisfied, the operation
output of the transition destination step is executed in the
next scan.
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.
When the transition condition is satisfied, the operation
output of the transition destination step is executed in the
next scan.
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.
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