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3.24 Service Processing
3.24.1 Service processing setting
This function allows to set the time and the number of times of service processing performed at END processing by
parameters.
Processing for requests from peripherals to the CPU module are performed with this function. The processing speed
for the communication response to the requests varies depending on the scan time and communication load. Set the
parameter of the service processing time as follows to achieve an optimal service processing environment for the
system used.
• Setting a longer time can improve the processing speed for the communication response.
• Setting a shorter time can avoid a prolonged scan time caused by the service processing.
Communications from multiple peripherals to the CPU module may slow down the processing speed for the
communication response. Adjust the settings for the system by specifying a longer service processing time or
modifying the parameter settings of the peripherals to set longer timeout times taking the processing speed for the
communication response and increases in scan times into consideration.
The service processing refers to the following:
• Communications via intelligent function modules (A link refresh from network modules is not included.)
• Communications via USB cables, RS-232 cables, and the built-in Ethernet port (Communications with
programming tool and GOT)
Using the COM instruction enables service processing during program execution of same performance with service
processing at END processing. Therefore, the high-speed service processing response can be performed even if the
scan time is long.
(1) Parameter setting
Set the parameters in the PLC system tab of the PLC parameter dialog box.
To perform the service processing, select any of the parameter items in the following table. The setting value of
deselected parameter cannot be entered. (Default: Execute the process as the scan time proceeds. = 10%)
Item Description Setting range Remarks
Execute the process as
the scan time proceeds.
Set the percentage of service processing
for one scan.
• Range: 1 to 99%
• Unit: 1%
Default when selected =10%
Specify service process
time.
Set the time of service processing for one
scan.
• Range: 0.2ms to 1000ms
• Unit: 0.1ms
Default when selected =0.2ms
Specify service process
execution counts.
Set the number of service processing for
one scan.
• Range: 1 to 10 times
• Unit: 1 time
Default when selected
=1 time
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