IEC 60870-5-104 protocol, error in log file.

[SergLSV]

In the log file for the channel used for communication via the IEC 60870-5-104 protocol, I am constantly encountering the error 'Tx 16 bytes at 26-NOV-2024 06:58:02.557 to "IEC104.Direct Outstation 3" SCN(Error Response)'. What does this error mean, and does it affect the quality of communication via the protocol? I`m using Geo SCADA Expert 2020

[sbeadle · Accepted solution]

No reply to this yet? My only suggestion is to look at the protocol comms log and show it to a 60870 expert.

[Brian0]

Google: IEC 60870-5-104 SCN error

An "IEC 60870-5-104 SCN error" indicates a communication error within the IEC 60870-5-104 protocol, which is a standard used for data exchange in power system automation, specifically related to the "SCN" (Status Code Not Valid) message, meaning the received status code from a device is not recognized or considered valid by the system trying to communicate with it.

Key points about this error:
Protocol issue:
This error signifies a problem with the data format or structure sent by the device, potentially due to incorrect configuration, firmware issues, or a malfunctioning device.
Status code mismatch:
The "SCN" error means the receiving system couldn't understand the status code received from the device, which is used to indicate the state of a command or data transfer.
Potential causes:
Incorrect device configuration: The device might be set to send an invalid status code due to incorrect settings.
Communication issues: Network problems like packet loss or latency could corrupt the data transmission, leading to a misinterpreted status code.
Firmware incompatibility: Outdated firmware on the device might not be compatible with the communication protocol version used by the system.
Faulty device: Hardware issues with the device itself could be causing the incorrect status code transmission.