Rockwell Automation 1786-series ControlNet Coax Media Planning and Installation Guide - Manual (Page 32)

32 Publication CNET-IN002B-EN-P - June 2010
Chapter 2 Plan a ControlNet Coax Media System
Redundant Media Example
Each node on a redundant-cable link must support redundant coax
connections and be connected to both trunk cables at all times. Any nodes
connected to only one side of a redundant-cable link will result in media errors
on the unconnected trunk cable.
A node supporting redundant trunk-cable connections will function even if
trunk cable A is connected to the B connector on the node and vice-versa.
This makes cable fault indications (on the hardware or in software) difficult to
interpret and makes locating a bad cable segment very difficult, so be certain to
properly label the trunk and taps with the provided channel A and
channel B labels.
20135-M
1788-RPA 1788-RPCD
CH1 CH2
1788-RPA 1788-RPCD
CH1 CH2
1
2
3
3 3
4
5
5
6 6
6 6
4
1
3 3
3
3 3
1
2
Item Description
1 Segment (trunk sections and taps between terminating resistors)
2 Trunk cable A
3 Terminating resistor
4 Trunk cable B
5 Repeater
6 Node supporting redundant media