Operation Details - Mitsubishi Electric MELSEC iQ-R Series User Manual

Operation details

Operations enabled by setting details of the device/label access service processing setting are as follows.
Execute the process as scan time proceeds
This setting is useful to execute the device/label access service processing in a way commensurate with the system size. It
allows the system to be designed without considering the device/label access service processing time because it is
determined as a function of the scan time.
Ex.
When "Scan time ratio = 10%" is set
Control processing
(At program execution)
Refresh processing
Program execution
END processing
Refresh processing
Program execution
END processing
Request 2
Refresh processing
Program execution
Request 3
END processing
Request 4
(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.
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
Communication processing
Communication
processing
(3)
1ms
(4)
1.2ms
Appendix 9 Target List and Operation Details of the Device/Label Access Service Processing Setting
Device/label access service
processing request
(1)
Request 1
(2)
Engineering tool
*1
is enabled, until the ratio
APPX
737
A