7 DEVICE/LABEL ACCESS SERVICE PROCESSING SETTING
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Operation details of service process
The operation details of service process are described below.
The following table shows the methods for service process with their respective features.
*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.
Device/label access
service processing setting
Scan performance Service process
performance
Device
splitting
*5
Features
Extension
*1
Stability
*2
Response
time
*3
Stability
*4
None Large Medium Fast High None Effective when service process is given
precedence.
Set the frequency of service
process
Medium High Medium Medium None Effective when scan process is given
precedence.
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