Understanding these timing and their relationship between them allows to configure more robust networks and to understand some of the effects that arise when a communication problem occurs. Therefore, the device could probably be absent from the network.The configuration of the Modbus-RTU networks involves several configuration parameters related to the "time": timeout, response timeout, scan range, etc. Basically, this code means that no answer was received by the destination device. Therefore, the gateway could probably be misconfigured or overloaded. Basically, this code means the gateway couldn’t allocate an internal path to process the request.
The master can retry the request, but service may be required on the slave device. The slave attempted to read extended memory, but detected a parity error in the memory. The master should retransmit the message later when the slave is free. The slave is processing a long-duration program command.
The master can then issue a Poll Program Complete message to determine if processing is completed. This response is returned to prevent a timeout error from occurring in the master. The slave has accepted a request and is processing it, but a long duration of time is required. The data address received in the query is not an allowable address for the slave and therefore cannot be used.Ī value contained in the query data field is not an allowable value for the slave.Īn unrecoverable error occurred while the slave was attempting to perform the request action. If a Poll Program Complete command was issued, then this code indicates that no program function preceded it. The function code received in the query is not an allowable action for the slave. Codes not listed below are specific to certain devices therefore, you should look them up in their respective documentation. The following table lists the exception codes as well as their meaning. When the driver receives these codes, it will register them in its communication log alongside the “MODBUS exception response” message. How can I interpret this message? Which are the protocol exception codes for Modbus driver?įirstly, there are some exception codes expected by Modbus protocol these codes are returned by a device whenever a request is received but can’t be executed, for any reasons. According to the driver log, you can identify a default error message. A common issue faced by Modbus driver is this: the communication takes place, but the tag displays an error message.
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