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  3. NAK Error (Code = 56h or C056h) is returned in Ethernet communication with MELSEC.
  • OPC Server
  • DeviceGateway
  • DAServer

NAK Error (Code = 56h or C056h) is returned in Ethernet communication with MELSEC.

2020.05.19

NAK Error (Code = 56h or C056h) is an error code when accessing address that does not exist on the MELSEC CPU.

Please confirm whether the address of the tag exists on the MELSEC CPU side.

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