Installation guide

Installing an RIO Network
890 USE 101 00 October 2006 119
Optional Drop
Cable In-line
Termination
All drop adapters—except those listed in RIO Network Cable System, p. 16—
provide 75 Ω termination inside the modules themselves. You may want to consider
providing the drop cables leading to these adapters with self-terminating F or BNC
adapters to assure proper cable termination when the drop adapter is disconnected.
Modicon 52-0370-000 Self-terminating BNC Adapters may be used optionally in
cases where self-terminating BNC connections are desired. For RG-6 cable,
Modicon 52-0411-000 Self-terminating F Adapters may be used for quad shield drop
cable, and Modicon 52-0399-000 Self-terminating F Adapters may be used for non-
quad shield drop cable.
Installing a Self-
terminating
Adapter on a
Drop Cable
Take the following steps to install a self-terminating adapter on a drop cable.
Step Action
1 Cut the drop cable into two sections, one of which is 18 in. (45 cm) long. Install
an F or BNC connector on each end of the 18 in. cable section.
2 Install an F connector on one end of the longer drop cable section and the self-
terminating F or BNC adapter on the other end.
3 Connect the 18 in. section of drop cable to the cable port on the RIO drop adapter
using the end that has the label attached closer to it (connection point A).
Connect the other end of the 18 in section of drop cable to the self-terminating
adapter on one end of the longer drop cable (connection point B).
4 Connect the F connector on the other end of the longer drop cable section to the
tap port. The drop connection is now complete.
5 To disconnect the drop from the network while the network is running, disconnect
the 18 in drop cable section from the self-terminating adapter (connection point
B), then from the drop adapter (connection point A).
Label
Self terminating
Adapter
Longer Section of
Drop Cable
Connects to
Tap Port
50 ... 140 ft (15 ... 40 m)18 in. (45 cm)
AB
Connects to
Drop Adapter
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com