Mitsubishi L02CPU, User Manual, Page: 90 / 340

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3.6
Service Processing Setting
This function allows to set the time and the number of times of service processing performed at END processing by
parameters. By using this function, communications with a peripheral can be improved and the extended scan time
due to service processing can be shortened.
● The service processing is the service processing of communications with a peripheral and intelligent function modules.
Note that auto refresh with a module such as the CC-Link system master/local module is not included.
●
Using the COM instruction enables the service processing during program execution while the processing is normally
performed during END processing. Use this function when the scan time is long.
(1) Setting method
Configure the setting of the service processing.
Project Window [Parameter] [PLC Parameter] [PLC System]
"Execute the process as the scan time proceeds" is selected by default.
*1 There is a margin of error between -20µs to +30µs against actual processing time.
*2 The response performance of service processing significantly reduces in the following cases. Set service processing
time considering the time-out time of the peripheral.
• Service processing time is set much shorter than the scan time.
• Setting "Execute it while waiting for constant scan setting" results in increase in the scan time and decrease in the
service processing time.
*3 For the following functions, scan time will be increased longer than the specified time during service processing even if
the service processing time specification is set.
• Online change
• Change T/C setting
• Local device monitor
• Program memory backup
• Writing to/reading from the file register or the buffer memory of an intelligent function module
(The scan time is increased when the write or read size is large.)
• Diagnostic function of CC-Link
*4 Note that the scan time is increased much longer if the CPU module simultaneously receives multiple requests while the
service processing count specification is set many.
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
*1 *2 *3
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
*4
Set the number of service processing for one
scan. • Range: 1 to 10 times
• Unit: 1 time
Default when selected = 1 time
Execute it while waiting for
constant scan setting.
*2
Set whether to perform service processing
during waiting time for constant scan setting.
⎯
Even when the waiting time is 0.2ms
or less, the service processing time of
0.2ms is added to the scan time.
Select any one option button.
Deselected parameters remain
unavailable.