Received packet header has invalid CRC

What does ERR_INVALID_HEADER_CRC mean?

A received Modbus TCP packet's header contained an invalid Cyclic Redundancy Check (CRC). This indicates data corruption during transmission or an improperly formed packet originating from the sender.

• Network interference or noise corrupting data during transmission.
• Faulty network hardware (cables, switches, network interface card).
• Remote Modbus TCP client sending malformed packets due to software or configuration error.

Click steps to track your progress.

1. 1

   Check the integrity of network cabling and connections between the controller and the remote device.

2. 2

   Verify the remote Modbus TCP client is sending correctly formatted Modbus TCP packets.

3. 3

   Inspect network hardware for faults and ensure proper grounding.

4. 4

   Monitor network traffic with a protocol analyzer to identify the source of corruption.