We have a High-Power Relay Controller 16-Channel (ZUXPR1630PROXR_ETHERNET) board that is no longer communicating to a 8-Channel (XR830) expansion board. The 16 Channel boards relay’s operate, but the expansion boards relays stopped working. There is power. We checked the ribbon cable for continuity and it is plugged into the correct port.
Is there a pin-out I can check on the XR expansion port to try an isolate whether the problem is in the main board or expansion board?