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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
4.2.1 Initial execution type program
(1) Definition of initial execution type program
(a) An initial execution type program is executed once only at power ON, or
when STOP to RUN switching occurs.
(b) This program's execute type is designated as "initial" in the program of the
PLC parameters.
(c) In the same manner as the initial processing for the intelligent function
module, the initial execution program is executed only once, and is not
required in subsequent scans.
An instruction that contains a complete device cannot be used for an initial
execution type program because the complete device needs several scans
to complete the execution.
Initial execution
type program
Using initial execution type program
Program A
Scan execution
type program
Program B
Initial program
Control with one program
Program to execute
at every scan
Division into initial
execution type program
and scan execution type
(2) Using multiple initial execution type programs
When multiple initial execution type programs are used, they are executed one
by one in ascending order of the program in the PLC parameters.
(3) END processing
END processing is performed when all initial execution type programs are
completed, and the "scan execution type program" is then executed from the
next scan.
Initial execution
type program A
Initial execution
type program B
Initial execution
type program n
END processing
Scan execution
type program
Power supply ON/STOP to RUN
Executed by program
setting order.
1 Scan