8 RUNNING A PROGRAM
8.2 Scan Time
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8
Device/label access service processing setting
The user can specify the time or the execution timing of the device/label access service processing which is performed during
the END processing.
A request to the CPU module from a peripheral is processed by the device/label access service processing. A communication
response to a request from a peripheral varies depending on the scan time and the state of communication load. To create the
service processing environment suitable for the system, change the device/label access service processing setting as shown
below.
• Set a longer time for the device/label access service processing to improve a communication response to a peripheral.
• Set a shorter time for the device/label access service processing to reduce a scan time extension due to service
processing.
Note that communications to the CPU module from multiple peripherals may lower a communication response to each
peripheral. Thus, consider the performance of communication responses and the extension of scan time, and adjust the
service processing environment according to the system by methods such as setting a longer time for the device/label access
service processing or changing the parameter settings of peripherals so that the timeout time becomes longer.
For functions to which the device/label access service processing setting can be applied, refer to the list
targeted for device/label access service processing setting. ( Page 735 Target list)
GOT GOT
GOT A
GOT A
GOT B
1ms
Engineering tool
Ladder monitor Device monitor
Refresh processing
Control processing (at program execution)
Device and label access service processing setting = 10% of scan time
Device and label access service processing time = 1ms
Program execution
END processing
1 scan (10ms)
Device/label access
service processing
request
Engineering tool
The device/label access
service processing is
executed in the END
processing.
Engineering tool
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