Chapter 5 Sfc Program Processing Sequence; Whole Program Processing Of Basic Model Qcpu; Whole Program Processing Sequence - Mitsubishi Electric MELSEC-Q Series Programming Manual

5
SFC PROGRAM PROCESSING SEQUENCE
This chapter describes the processing sequence of the SFC programs.
5.1

Whole Program Processing of Basic Model QCPU

This section describes the program processing of the Basic model QCPU. Since this manual describes only the outline, refer
to the QCPU User's Manual (Function Explanation, Programming Fundamentals) for details.

Whole program processing sequence

The Basic model QCPU can create and execute two programs, "sequence program" and "SFC program", in the program
memory. (Two sequence programs or two SFC programs cannot be created. A SFC program for program execution
management cannot be created either.)
• The execution types of the sequence program and SFC program are fixed to the "scan execution type". (The execution
types of the sequence program and SFC program are fixed.)
• The Basic model QCPU executes the SFC program after execution of the sequence program. (The execution order of the
sequence program and SFC program is fixed.)
• The file name of the sequence program is fixed to "MAIN". Also, the file name of the SFC program is fixed to "MAIN-SFC".
When both the "sequence program" and "SFC program" exist in the program memory, both programs are
executed. Delete the programs, which will not be executed, from the program memory. When ROM operation
is performed, delete the programs, which will not be executed, from the standard ROM.
5 SFC PROGRAM PROCESSING SEQUENCE
5.1 Whole Program Processing of Basic Model QCPU
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