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CHAPTER 3 CPU MODULE FUNCTIONS
3
3.6 Service Processing Setting
(2) Operation for service processing setting
Operations for each service processing setting is described below.
(a) Execute the process as the scan time proceeds
Operation when 10% is set is as shown below.
● When the constant scan is set, ( Page 92, Section 3.6 (2)(d)), the calculation of the service processing time is a
calculation of the percentage of the time excluding the waiting time of the constant scan from the scan time, not a
calculation of the percentage of the scan time.
Operation when 50% is set
● If no request data for service processing exists, END processing speeds up by the amount of request processing time.
(The CPU module does not wait for requests.)
Program execution
END processing
Request 1)
Program execution
END processing
Request 2)-1
Program execution
END processing
Request 3)
Peripheral
Request 2)-2
1ms
1ms
1.2ms
The service processing time depends on the
scan time (program execution time).
When time required for processing one request
exceeds 10% of one scan time, the service
processing is suspended and the remaining
requests are processed at the END processing
in the next scan.
1st scan
(10ms)
2nd scan
(10ms)
3rd scan
(12ms)
Request 1)
Request 2)
Request 3)
Request 4)
Request 5)
Ex.
Ex.
Program execution
END processing
Waiting time
Service processing
0% 50% 100%
Scan time (constant scan setting)
Service processing time
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