godfrey
Member
I recently commissioned an AB PLC network. One of the OITs displays the DH+ hardware failed error about once every 2-4 days. I'm sure the cabling and resistor terminating is OK. AB support says maybe the OIT can't find the address in the PLC. If that was the case, I would think the error would display right away. The error goes away when I cycle power to the OIT. I'm not sure what to check next. I'd like to hear of anyone's experience in dealing with this error.