Hi @izzyskate01,
Thank you for contributing to our forum.
Below is a link to our PLC connection guide for the M251. Could you ensure your steps follow the instructions in this guide?
If you are still receiving the error code, could you send the serial number of your device as well as screenshots of your project to help us further diagnose the problem?
Thank you!
M251 Connection Guideo
All connection guide if needed
https://forum.weintekusa.com/pub/supported-devices