Whole Program Processing Of High Performance Model Qcpu, Process Cpu, Redundant Cpu, Universal Model Qcpu, And Lcpu; Whole Program Processing Sequence - Mitsubishi Electric MELSEC-Q Series Programming Manual

5.2
Whole Program Processing of High Performance
Model QCPU, Process CPU, Redundant CPU,
Universal Model QCPU, and LCPU
This section explains the whole program processing of the High Performance model QCPU, Process CPU, Redundant CPU,
Universal model QCPU, and LCPU. 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 High Performance model QCPU, Process CPU, Redundant CPU, Universal model QCPU, and LCPU can store multiple
programs in the program memory as files, and can execute multiple files concurrently or the specified file only. The whole
operation image is as shown below.
No. Execution Type

Initial execution type program (Initial)

Scan execution type program (Scan)

Low speed execution type program
(Low speed)
5 SFC PROGRAM PROCESSING SEQUENCE
146
5.2 Whole Program Processing of High Performance Model QCPU, Process CPU, Redundant CPU, Universal Model QCPU, and
Description
• Executed only in one scan when the
programmable controller is powered ON or the
CPU module is switched from STOP to RUN.
• After that switches to a stand-by program.
Program executed every scan.
Program executed in the extra time of the constant
scan time, or program executed only during preset
time.
SFC Compatibility

Max. 124 programs (changes depending on the CPU
module type)
*2
SFC program: Max. 2 programs
• Normal SFC program: 1 program
• SFC program for program execution management:
*3
1 program
