Mitsubishi Q00JCPU User Manual page 495

6
FUNCTIONS
(4) Precautions
The following describes the precautions when the service processing settings are
configured.
1) On the following functions, scan time will increase longer than the specified
time during service processing even if the service processing time
specification is set.
• Online change
• Change TC setting
• Local device monitor
• Program memory backup
• Writing/reading to/from a file register (The scan time will be prolonged
when the write/read size is large.)
• Buffer memory write/read of the intelligent function module (The scan time
increases when the size of write/read data is large.)
• Access to network module
a) Diagnostics function
(Network diagnostics, Ethernet diagnostics, CC-Link diagnostics)
b) Monitor function (Module access device, Link direct device)
2) Take note that the scan time will increase much longer if multiple requests are
received simultaneously when the service processing count specification is set
many.
3) When setting the service processing time much shorter than the scan time, the
response quality of service processing is extremely reduced. Set the service
processing time with considering the time out time of peripheral devices.
4) An error of -20 s to +30 s occurs between the actual processing time and the
set service processing time.
6.25 Service Processing
6.25.2 Service processing
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