This may be because the function code is only applicable to newer devices, and was not implemented in the unit selected. The function code received in the query is not an allowable action for the server. The exception codes as explained in the Modbus specification are: Exception Code Please see the table below for a description of each possible error code. When a Magelis HMI is communicating to a Modbus device over Modbus TCP/IP or Modbus RTU, there are serveral different error codes that the PLC may return in the event of an exception. Vijeo Designer (all versions), Magelis series, XBTGT, HMIGTO, HMIGTU, HMISTO, HMISTU, HMIGK, iPC The Magelis HMI is showing an error "The PLC equipment has returned error code 0AH".
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