Rockwell Automation 1786-series ControlNet Coax Media Planning and Installation Guide - Manual (Page 23)

Publication CNET-IN002B-EN-P - June 2010 23
Plan a ControlNet Coax Media System Chapter 2
Tap, Trunk-cable Section, and Terminating Resistors
Select the shortest path for routing the cable to minimize the amount of cable
you need. The specific details of planning such a cable route depends upon the
needs of your network and environments.
There is no minimum trunk-cable section length limit. The maximum
allowable total length of a segment is 1000 m (3280 ft) with two taps
connected. Each additional tap decreases the maximum length of the segment
by 16.3 m (53.4 ft). The maximum number of taps allowed on a segment is 48,
with a maximum length of 250 m (820 ft).
Segment Length and Number of Taps
2 2 3 3
1 1 1
30094-m
Item Description
1 Tap
2 Terminating resistors
3 Trunk-cable section
1000 (3280)
750 (2460)
500 (1640)
250 (820)
2 16 32 48
Max allowable segment length =
1000 m (3280 ft) - 16.3 m (53.4 ft) X [number of taps - 2]
Number of Taps
S
eg
m
en
t
Le
ng
th
m
(f
t)
30014-m
Allowable
Region