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16 DEVICE/LABEL ACCESS SERVICE PROCESSING SETTING
*1 Shows the maximum a scan time is extended by the service process.
*2 Shows the extent of fluctuation of scan time or the degree of scattering by the service process.
*3 Shows the time between receiving a service process request from the peripheral equipment to returning a response.
*4 Shows the extent of fluctuation of time until returning the response or the degree of scattering due to the contents of service process
request from the peripheral equipment.
*5 Shows if device splitting will occur.
■Device/label access service processing setting "No Setting"
Since all service processes can be executed normally for every scan time, steady communication is possible even on a
system that uses multiple peripheral equipment.
Wait for request process will not be executed when there is no request data.
■Device/label access service processing setting "Set Processing Counts"
Because a frequency of service process executed in 1 scan time can be set, the scan time is stabilized even on a system that
uses multiple peripheral equipment.
Operation during STOP/PAUSE
Regardless of the service process settings during STOP/PAUSE, execute all requests in scan 1.
However, a request from the identical port will be processed only 1 time in 1 scan.
For example, after serial communication CH1 process, even if serial communication CH1 receives a new command request
again when Ethernet connection 1 is in process, the 2nd request is not executed in this scan and will be carried over to the
next scan.
Setting method
The device/label access service processing can be configured as follows.
Navigation window [Parameter] [FX5UCPU] [CPU Parameter] "Service Processing Setting" "Device/Label
Access Service Processing Setting"
Window
Displayed items
Precautions
If "Set Processing Counts" is selected and many service process frequencies are set, when multiple requests are received at
the same time, scan time may be prolonged to a large extent, so please exercise caution.
Item Description Setting range Default
Specifying Method Set the method of device/label access service processing. • Set Processing Counts
•No Setting
No Setting
Counts Set the number of executions of device/label access service
processing.
1 to 10 [Time] (1 time Unit)