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3.3 Settings for Creation and Execution of Multiple Sequence Programs
3.3.3 Low speed execution type program
3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
3.3.3 Low speed execution type program
Note21
(1) Definition of low speed execution type program
A low speed execution type program is executed only during the excess time of
constant scan or the preset low speed program execution time.
The low speed execution type program can be used for the program that need not be
executed every scan (e.g. output to a printer).
(2) Low speed execution type program processing
(a) Execution operation
The low speed execution type program execution varies depending on the
following settings.
Use a desired setting as necessary.
1) When giving priority to the control accuracy at fixed scan time
Set the constant scan.
2) When securing the execution time for the low speed execution type
program
Set the low speed program execution time.
Make the above settings in the PLC RAS setting of the PLC parameter dialog
box.(
(4) in this section)
POINT
When executing a low speed execution type program, set either the constant scan
or the low speed program execution time.
Note21
Figure 3.30 Low speed execution type program execution (When executed during excess constant scan time)
Basic
Redundant
UD
Universal
Note3.22
The low speed execution type program is not available for the Basic model QCPU , Redundant
CPU and Universal model QCPU.
Basic
Redundant
UD
Universal
Scan execution type
program
Low speed
execution type
program
Scan
execution B
Scan
execution A
Low speed
execution B
Low speed
execution A
END processing
Scan
execution B
Scan
execution A
Low speed
execution B
Low speed
execution A
END processing
Low speed END
processing
Low speed END
processing
Constant scan
Scan time (1 scan)
Scan time (1 scan)
Low speed scan time
Low speed scan time