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5 SFC PROGRAM PROCESSING SEQUENCE
MELSEC-Q
(1) Transition processing for continuous transition OFF setting
The SFC program processing procedure without continuous transition will be explained.
a
X0
oY10
n
n+1
oY11
(1) Active step (n) instruction operation
(2) Transition condition satisfied/unsatisfied check
When transition condition
is unsatisfied
(3) END processing
(4) Instruction operation for the same step (n)
as that at the previous scan.
When transition condition
is satisfied
(3)' The active step (n) is deactivated, and the coil
where the OUT instruction is ON is switched OFF.
If other blocks exist subsequent the block
in question, END processing will be executed
after those blocks have been processed.
(4)' END processing
If other blocks exist subsequent the block
in question, END processing will be executed
after those blocks have been processed.
(5)' Instruction operation of the step (n+1) next to the step
which is deactivated at the previous scan.
POINT
END processing is performed after all the program files set to the "scan execution type" in the
program setting of the PLC parameter dialog box have been executed.
Refer to the QCPU User's Manual (Function Explanation, Programming Fundamentals) for
the detailed processing order of the programs other than the SFC program and their
processings
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