Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual - Manual (Page 24)

Publication CNET-IN003A-EN-P - January 2006
2-2 Plan a ControlNet Ex Media System
Determine How Many Taps
You Need
The number of taps you need depends on the number of devices you
want to connect to the network. You need a tap for each node,
repeater, or fiber hub on the network.
If you plan to add nodes later, you should consider ordering and
installing the cable and connectors for these additional nodes when
you install the initial network. This will minimize disruption to the
network during operation.
Each tap kit contains the following pieces:
TIP
A disconnected drop cable can cause noise to enter
the network. Because of this, we recommend that
you have only one unconnected tap per network
for maintenance purposes. Use a tap terminator,
catalog number 1797-TCAP, on any unconnected
drop cable.
TIP
If you are planning future installation of additional
nodes, and can tolerate losing communication for a
short time, do not install the tap. Instead, install a
BNC bullet connector, catalog number 1786-BNCJ.
See page 2-8 for more information on the 1786-BNC
bullet connector.
Dust Cap
Screws
Tap (1797-TPS, -TPR, -TPYS, -TPYR)
For noise suppression, ferrite beads
are molded on the drop cable.
ControlNet Ex
Cable Labels
BNC Connector Kits
Universal Mounting Bracket
41329
Ex Insulator Kit
With Intrinsically-safe
Insulators
30394-M
TIP
We provide the light-blue intrinsically-safe insulators
and dust caps to cover exposed metal parts. Use
these items for instrinsically safe system certification
by local agencies.