Mitsubishi Electric MELSEC iQ-R Series User Manual page 149

Operation when information cannot be transmitted to target device
The following describes how C24 operates when the information of the programmable controller CPU monitoring results
cannot be sent to the target device due to line disconnection or other reasons.
Even if an error occurs while the programmable controller CPU monitoring function is in operation, the ERR LED does not turn
ON. (This is the same as when using the on-demand function of the MC protocol.)
■When the setting for the send monitoring time designation (timer 2) is 'Unlimited wait' (0H)
• Reading of monitoring data from the CPU module stops until the transmission of the monitoring data is completed.
• When transmission resumes, reading of monitoring data from the CPU module resumes and monitoring data and
information are transmitted.
■When the setting for the send monitoring time designation (timer 2) is other than 'Unlimited
wait' (0H)
• A transmission timeout error occurs. Reading of monitoring information from the CPU module and transmission of the
information resumes.
• The error code is stored in the 'programmable controller CPU monitoring function execution result (current)' (Un\G8709/
8965).
When CPU module error occurs
When device data for the programmable controller CPU cannot be read because of a CPU module error (hardware failure,
etc.), the error code is stored in the programmable controller CPU monitoring function error code storage area and C24
performs the monitoring processing based on previously read data.
Modem connection error
When the monitoring information is transmitted with the modem function, a modem connection error will occur if a modem
connection request is issued for the following reason.
• Connection request by the 'connection request' (Y11)
If possible, provide a dedicated C24 for using the programmable controller CPU monitoring function.
When using both the programmable controller CPU monitoring function and data communication function with a single C24
and one of the above modem connection errors occurs, re-execute a connection request in consideration of the transmission
timing set by the user for the programmable controller CPU monitoring function.
6 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
6.4 Considerations for Using the Programmable Controller CPU Monitoring Function
6
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