Rockwell Automation 1786-series ControlNet Coax Media Planning and Installation Guide - Manual (Page 38)

38 Publication CNET-IN002B-EN-P - June 2010
Chapter 2 Plan a ControlNet Coax Media System
Plan the Tap Connections After you mount your taps, you need to connect the taps. Choose the tap
connection procedure that best suits your installation requirements. Make sure
that taps and barrels are well aligned, and DIN-rail clips can freely slide over
the rail.
You can connect Y-taps and T-taps by using a 1786-TJPR plug-to-plug jumper
with a 38 mm (1.5 in.) bend radius.
You can connect T-taps installed on one DIN rail by using barrel
(plug-to-plug) connectors. T-taps connected with 1786-BNCP barrel
connectors require horizontal mounting of the taps on one DIN rail by using a
tap transition plate.
IMPORTANT
When connecting taps, follow these considerations for
proper installation.
•
While taps are electrically isolated from the DIN rail, many
Rockwell Automation products are grounded through the
DIN rail to chassis ground. Any Rockwell Automation
product that is grounded through the DIN rail must use
zinc-plated yellow-chromate steel DIN rail.
Do not use non-conductive or aluminum DIN rails for
devices that obtain their ground through the DIN rail. Taps
may be mounted to any suitable DIN rail as they are
ground-isolated.
•
Do not use barrel connectors to connect taps on separate
DIN rails. Barrel connectors should be used only if taps are
securely mounted on the same DIN rail or same surface.
I nsecure mounts or use of barrel connectors between
multiple DIN rails results in loose connections and tap
failure.
•
Observe the minimum bend radius for interconnecting
coaxial cables. For the 1786-TJPR bend radius, see
page 39 for an example.
The 1786-TJPR jumper has an attenuation that is
approximately double that of standard 1786-RG-6
coax cable.