Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 243

Item
Set whether to perform service
Execute it while waiting
processing during waiting time for
for constant scan setting.
constant scan setting.
(2) Operations for service processing setting
Operations for each service processing setting is described below.
(a) Operation when "Execute the process as the scan time proceeds." is selected
• Operation when 10% is set
END processing
END processing
END processing
If no request data for service processing exists, END processing speeds up by the request processing time. (The CPU
module does not wait for requests.)
• Operation for constant scan setting
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
Ex.
0%
When setting the constant scan, selecting "Execute it while waiting for constant scan setting." can perform the service
processing efficiently. (
Description
Program execution
1ms
Request 1
Program execution
1ms
Request 2-1
Program execution
1.2ms
Request 2-2
Request 3
50%
END processing
Program execution
Service processing
Service processing time
Scan time (constant scan setting)
Page 244, Section 3.24.1 (2) (d))
Setting range
-
When the time required for processing
one request exceeds 10% of one scan
time, the service processing is suspended
and the request is processed at END
processing in the next scan.
The service processing time depends on the
scan time (program execution time).
100%
Waiting time
CHAPTER 3 FUNCTIONS
Remarks
Even when the waiting time is
0.2ms or less, the service
processing time (0.2ms) will be
added to the scan time at service
processing execution.
Programming tool
3
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