Mitsubishi Electric MELSEC iQ-R Series User Manual page 740

Set Processing Time
This setting is useful to give priority to the device/label access service processing. It allows for stable communication because
the CPU module can always process a constant amount of the device/label access service processing without affecting the
scan time.
Ex.
When "Processing time = 1ms" 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) Multiple requests are processed until the specified processing time (1ms) is exceeded. If the specified processing time is exceeded, the remaining requests
are processed in the END processing of the next scan.
(3) Operations such as access to device, which are synchronized with the program, are processed in the END processing.
(4) The maximum device/label access service processing time available is the same even when the scan time (program execution time) varies.
For operations such as access to devices, which are synchronized with the program, adjust the time by this
setting because they are processed during the END processing. If no request data for the device/label access
service processing exists, the scan time is shortened by the specified ratio as the CPU module proceeds to
the next scan without waiting for requests.
However, when the device/label access service processing constant wait function
set for the device/label access service processing setting of the CPU parameters is reached, the CPU module
waits for requests even if requests for service processing do not exist.
*1 For details on the versions of the compatible CPU modules, refer to the following.
Page 747 Added and Enhanced Functions
APPX
738
Appendix 9 Target List and Operation Details of the Device/Label Access Service Processing Setting
Communication processing
Communication
processing
(3)
1ms
Request 2
(4)
1ms
Request 3
Request 4
Device/label access service
processing request
(1)
Request 1
(2)
Engineering tool
*1
is enabled, until the time