Thanks Panic Mode! I have it working. I am not sure if that was the actual problem or not. I violated my own rule of "change only one thing". I disconnected the parent node (X44), saved the project and re-opened. After doing so, the individual Beckhoff IO modules were listed in IO mapping and I was able to connect everything up. After deploying things work like a charm (at least output does). Thanks again for your patience!