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4 SFC PROGRAM CONFIGURATION
MELSEC-Q
4.3.5 Precautions for creating operation output (step)/transition condition
programs
This section explains the precautions for creating operation output (step) and transition condition
programs.
(1) Step program
(a) Step program expression method
Since a step program cannot use contacts and instructions equivalent to contacts, the
operation output of an active step is executed when the transition condition is satisfied.
Also, a step attribute is used to hold the output or continue operation when the step is
activated.
A step program is expressed as a ladder circuit as shown below.
Output instruction
REMARKS
If a program is not created at a step, an error will not occur.
In this case, no processing is performed until the transition condition immediately following the
corresponding step is satisfied.
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