12.
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OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU
12.1.3 Low-speed execution type program
(1) Definition
(a) The low-speed execution type program is a program that is executed only in the
surplus time of constant scan operation or in the preset low-speed execution
program execution time.
• When using a fixed scan time to give priority to control accuracy, set the
constant scan time in "PLC RAS" in the GPP function's parameter mode.
(Setting range: 5 to 2000ms; Unit: 5ms)
• To ensure the execution time for low-speed execution type programs in each
scan and to make these programs operate properly, set the low-speed
program execution time in "PLC RAS" in the parameter mode.
(Setting range: 1 to 2000ms; Unit: 1ms)
• In order to execute low-speed execution type programs, either the constant
scan time or the low-speed program execution time must be set.
(b) Set "Slow" as the execution type in program setting in the parameter mode.
(c) This execution type is used for programs that do not have to be executed every
scan, such as a program for printer output.
(2) Execution of multiple low-speed execution type programs
If there are more than one low-speed execution type program, they are executed in
ascending order of the program numbers set in the parameter mode.
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