Filter
Top Products
20
1 PROGRAM EXECUTION
1.4 Execution Type of Program
1.4 Execution Type of Program
Set the program execution conditions.
Initial execution type program
This program type is executed only once when the CPU module changes from the STOP/PAUSE to the RUN status. This
program type is used for programs, that do not need to be executed from the next scan once they are executed, like initial
processing on an intelligent function module.
Also, the execution time of initial execution type programs is the same as the initial scan time.
When multiple initial execution type programs are executed, the execution time of the initial execution type programs
becomes the time until execution of all initial execution type programs is completed.
Precautions
The precautions for initial execution type programs are explained below.
■Restrictions in programming
With initial execution type programs, do not use instructions that require several scans to complete execution (instructions for
which completion devices exist).
Ex.
e.g. RBFM and WBFM instructions
When an initial execution type program is used
Program A
Program B
Control by one program
Initial execution
type program
Scan execution
type program
One program can be divided into initial execution
type and scan execution type program.
Processing performed
only once
Processing performed
in every scan
1st scan 2nd scan 3rd scan
STOP/PAUSE→RUN
END processing
Initial execution type program A
Initial execution type program B
Scan execution type program
Initial execution type program C
0 END
0 END
0
0
END
0END 0END
Initial scan time is the sum of the execution time of initial execution type programs
and the END processing time.