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CHAPTER 3 FUNCTIONS
3
3.24 Service Processing
3.24.1 Service processing setting
(c) Operation when "Specify service process execution counts." is selected
• Operation when 1 time is set
• Operation when 2 times is set
● When several devices are connected to one CPU module, each device requests service processing. When the CPU
module receives requests from several devices simultaneously, a single END processing can accept several requests
simultaneously if the service processing count is set to the number of connected devices. This improves response
performance. (Note that the scan time increases by the service processing time.)
● If no request data exists when setting the service processing count, END processing speeds up by the request
processing time. (The CPU module does not wait for requests.)
Program execution
END processing
1st scan
Request 1
Program execution
END processing
2nd scan
Request 2
Program execution
END processing
3rd scan
Request 3
Programming tool
Regardless of request data size, one request
is processed at one END processing.
Even if the program execution time are the same,
the scan time depends on service processing time.
Request 1
Request 2
Request 3
Request 4
Request 5
Program execution
END processing
1st scan
Request 1
Program execution
END processing
2nd scan
Request 2
Request 3
Programming tool
Request 4
Regardless of request data size,
two requests are processed at
one END processing.
Request 1
Request 2
Request 3
Request 4
Request 5
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