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(1) Setting method
Configure the setting of the service processing.
Project Window [Parameter] [PLC Parameter] [PLC System]
Select any one option button.
Deselected parameters remain
unavailable.
"Execute the process as the scan time proceeds" is selected by default.
Item
Execute the process as the
Set the percentage of service processing for
*6
one scan.
scan time proceeds
Specify service process time
Set the time of service processing for one scan.
*1*2*3*6
Specify service process
Set the number of service processing for one
*4*5
scan.
execution counts
Execute it while waiting for
Set whether to perform service processing
*2*6
during waiting time for constant scan setting.
constant scan setting.
*1
There is a margin of error between -20s to +30s 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 a network module (CC IE Field diagnostics, CC-Link/ CC-Link/LT diagnostics)
Monitor function (module access device, link direct device)
*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.
*5
If a data communication is performed over Ethernet when "Specify service process execution counts" is selected in
parameter, the scan time will increase by the service processing time (approx. 500ms). To keep the scan time 500ms or
less, select an item other than "Specify service process execution counts" in parameter. (For example, select "Specify
service process time." and set a time value to 500ms or less.)
*6
If communications in the MC protocol are performed with an item other than "Specify service process execution counts"
selected, data inconsistency may occur. To prevent data inconsistency, select "Specify service process execution
counts".
Description
• Range: 1 to 99%
• Unit: 1%
• Range: 0.2ms to 1000ms
• Unit: 0.1ms
• Range: 1 to 10 times
• Unit: 1 time
CHAPTER 3 CPU MODULE FUNCTIONS
Setting range
Default when selected = 10%
Default when selected = 0.2ms
Default when selected = 1 time
Even when the waiting time is 0.2ms
or less, the service processing time of
0.2ms is added to the scan time.
3
Remarks
95
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