Faults And Alarms Related To The Modbus Rtu Communication; A128/F228 - Timeout For Serial Communication - WEG CFW100 User Manual

7 FAULTS AND ALARMS RELATED TO THE MODBUS RTU
COMMUNICATION
A128/F228 – TIMEOUT FOR SERIAL COMMUNICATION
Description:
It is the only alarm/fault related to the serial communication indicates that the equipment stopped receiving valid
serial telegrams for a period longer than the one programmed in P0314.
Operation:
The parameter P0314 allows programming a period of time during which the equipment must receive at least
one valid telegram via the RS485 serial interface – with address and error-checking field correct – otherwise, it
will be considered that there was any problem in the serial communication. The time counting initiates after the
reception of the first valid telegram. This function can be used by any serial protocol supported by the
equipment.
After the serial communication timeout has been identified, the A128 alarm or F228 fault message will be
showed on the HMI, depending on the P0313 programming. For alarms, if the communication is reestablished
and new valid telegrams are received, the alarm indication will be removed from the HMI.
Possible Causes/Correction:
Verify factors that could cause failures in the communication (cables, installation, and grounding).

Make sure that the master sends telegrams to the equipment in intervals shorter than the programmed in

P0314.
Disable this function at P0314.

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Faults and Alarms Related to the Modbus RTU Communication