Rockwell Automation 1734-ACNR POINT I/O ControlNet Adapter User Manual - Manual (Page 20)

Publication 1734-UM008B-EN-P - August 2005
2-8 Install Your Adapter
8. Reinsert the terminal block by rotating the terminal block into
the wiring base until it locks itself into place.
9. Replace the adjacent module in its base.
10. Use a tap to connect the ControlNet cable to the adapter.
You must use a tap to connect the adapter to the ControlNet
cable. Do not directly connect the adapter to the coax cable.
Without the ControlNet tap, the wiring violates the ControlNet
specification, inducing electrical characteristics such as
impedance and noise that cause the ControlNet network to fail.