Step Start (Activate) And End (Deactivate) Methods; Step Start (Activate) Methods; Step End (Deactivate) Methods - Mitsubishi Electric MELSEC-Q Series Programming Manual

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6.4
Step START (Activate) and END (Deactivate)
Methods
This section describes the step START (Activate) and END (Deactivate) methods.

Step START (activate) methods

There are the following step START (activation) methods.
Step START (Activation)
Method
Step START by SFC diagram symbol
Step START by SFC control instruction

Step END (deactivate) methods

Steps can be ended (deactivated) by the methods shown below.
END Method
END by SFC diagram symbol
END by SFC control instruction
6 SFC PROGRAM EXECUTION
164

6.4 Step START (Activate) and END (Deactivate) Methods

Operation
The corresponding step is automatically started when the
preceding transition condition is satisfied.
The specified step is forcibly started by the SFC control
instruction at the step (operation output) of the SFC
program or in another sequence program.
Operation
The step is automatically ended by the system when the
transition condition associated with the corresponding
step is satisfied.
Set the step to a reset step as the step attribute and
specify the step number to be ended.
The specified step is forcibly ended by the SFC control
instruction at the step (operation output) of the SFC
program or in another sequence program.
Remarks
Basic operation of SFC program
• Jump to other blocks can be made.
• When the block of the destination step is inactive, a
block forced START is made from the specified step.
• When there are initial steps in multiple blocks, a
selection START is made.
Remarks
• Basic operation of SFC program
• When the step attribute has been specified, operation
is performed according to the attribute.
• Convenient for ending the HOLD step when the
machine operation condition is satisfied during SFC
program execution, when a transition to the error
processing step is performed by selection branch, for
example.
• The step number to be ended can be specified in only
the same block.
• The steps in different blocks can also be ended.
• The block is ended when all steps of the corresponding
block are deactivated by the RST instruction.

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