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Kepware Knowledge Base: Solution

NetLink Error Code 0x12 (12) is Posted to the KEPServerEX Event Log

Last Update: 11/12/2018

Possible Cause:
This error code means "Master not into the logical token ring."

Verify the following settings to ensure that they are set correctly.

  • In the server, click Device Properties | Communication Parameters. Then, locate the MPI ID setting and verify that it is set to the PLC's MPI address.
  • In the NetLink Configuration Utility (which is located in the server's Utilities sub-directory and can be launched through the Start menu), locate the Own Station Address setting. This is the MPI address of the NetLink itself, and must be set to an address that is not used by the PLC or by any other device on the MPI bus.
  • Set the Highest Station Address of the PLC (or other MPI-bus masters) greater than or equal to the Own Station Address in the NetLink Configuration Utility.