Mitsubishi Electric MELSEC iQ-R-R00CPU - Page 941

APPX
Appendix 11 Target List and Operation Details of the Device/Label Access Service Processing Setting
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A
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.
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
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.
(1) Synchronization with program is unnecessary.
(2) Multiple requests are processed until the specified device/label access service processing ratio (10%) is exceeded. When the specified device/label access
service processing ratio is exceeded, the remaining requests are processed in the END processing of the next scan. Also, for scan which has the device/
label access service processing time shorter than 0.1ms, it is assumed as "The device/label access service processing time per scan = 0.1ms".
(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 varies because the scan time (program execution time) varies.
(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.
1ms
(1)
(2)
(3)
(4)
(12ms) (10ms) (10ms)
1ms
Control processing
(At program execution)
First scanSecond scanThird scan
Refresh processing
Program execution
END processing
Refresh processing
Program execution
END processing
Refresh processing
Program execution
END processing
Request 2
Request 3
Request 3
Request 4
Request 1
Communication
processing
Communication processing
Device/label access service
processing request
Request 4 Request 5 Request 2
Request 1
Request 3
Engineering tool