Mitsubishi Electric MELSEC iQ-R08CPU - Page 208

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1 FUNCTIONS
1.15 Simple CPU Communication Function (RJ71EN71, RnENCPU (Network Part))
Communication Time-out Period/Communication Retry Count/Monitoring Time At Error
When the communication destination does not respond or returns an error response, the communication will be retried
(resent) after the time-out period has passed.
At this time, after communications are performed for the communication retry count + 1 times, the fixed interval
communication is performed during the monitoring time at error. If the communication destination responds after these
communications, the communications at the execution interval specified with the parameters are restarted.
Ex.
Error detection timing when 2 is set for the communication retry count
The error is detected if the communication destination does not respond or communications fail by when the
following time has passed: (communication retry count + 1)  communication time-out period
Latency Time
By setting the latency time, the start timing in the communications can be switched in the following cases.
• To prevent an error due to the overlap of the start timing in the communications
• To start communications after the communication destination is ready for the communications
During the latency time, "Preparing" is indicated in the communication status.
Communications at a specified execution interval (when "Fixed" is set for the communication setting) is
ignored during the latency time.
Communication
timeout time
Retry of
communication,
first time
Communication
timeout time
Retry of
communication,
second time
Communication
error at the
previous time
Communication
error at the
previous time
Communication
error at the
previous time
Error detection
Interval
Communication Communication Communication Communication
Monitoring time
at error
Monitoring time
at error
Communication Communication
Communication
timeout time