Mitsubishi Electric MELSEC iQ-R Series User Manual page 741

Set Processing Counts
This setting is useful to stably execute the device/label access service processing in a system where requests come from
multiple peripherals. It provides stable communication in a system where multiple peripherals exist because the CPU module
can execute the device/label access service processing based on the number of request sources.
Ex.
When "Processing counts = 2" is set
Control processing
(At program execution)
Refresh processing
Program execution
END processing
Refresh processing
Program execution
END processing
Refresh processing
Program execution
END processing
(1) Synchronization with program is unnecessary.
(2) Two requests are processed in one END processing independently of the requested processing time.
For operations such as access to devices, which are synchronized with the program, adjust the number of
executions by this setting because they are processed during the END processing. If no request data for the
device/label access service processing exists, the CPU module proceeds to the next scan without waiting for
requests.
Communication processing
Communication
processing
(2)
Request 2
Request 3
(2)
Request 4
Request 5
Appendix 9 Target List and Operation Details of the Device/Label Access Service Processing Setting
Device/label access service
processing request
(1)
Request 1
Engineering tool
A
APPX
739