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  3. NAK Error (Code = 55h or C055h) is returned in Ethernet communication with MELSEC.
  • DAServer
  • OPC Server
  • DeviceGateway

NAK Error (Code = 55h or C055h) is returned in Ethernet communication with MELSEC.

2021.03.24

Check the ethernet network parameter in the MELSEC Ethernet port settings.

If the write permission is disabled in SLMP communication, MELSEC returns NAK code 55h or C055h.

If the write permission is disabled, change it to enabled.

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