Rockwell Automation 1786-series ControlNet Fiber Media Planning and Installation Guide - Manual (Page 14)

14 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Chapter 1 Get Started with the ControlNet Network Fiber Media System
Repeater Modules
There are two types of repeater modules: coax repeater (catalog number
1786-RPCD) and fiber repeaters (catalog numbers 1786-RPFS, 1786-RPFM,
1786-RPFRL/B, and 1786-RPFRXL/B). Although you can repeat coax signals
on a network by using a 1786-RPCD module, this manual mainly focuses on
fiber cabling for the fiber repeater modules.
See the ControlNet Coax Media Planning and Installation Guide, publication
CNET-IN002 , for more information on ControlNet copper networks.
The fiber repeater modules send an optical signal through the fiber cable to the
next fiber repeater module on the network. The combination of the repeater
adapter (see below) and a fiber repeater module, such as the 1786-RPFM, is
referred to as a fiber repeater.
Repeater Adapters
The ControlNet network uses a modular fiber repeater system. The 1786-RPA/B
repeater adapter connects to both coax and fiber media, supplies power to the
repeater modules, and repeats signals from the coax media to the fiber
repeater modules.
The repeater adapter can supply a maximum of 1.6 A @5V DC of current to
power the repeater modules.
To determine how many repeater modules you can use with a single repeater
adapter, calculate the current draw of all repeater modules in your system. Do not
exceed 1.6 A @ 5V DC per repeater adapter.
Table 3 - Repeater Module Current Draw
Repeater Module Backplane Current Draw
1786-RPFS 300 mA
1786-RPFM 400 mA
1786-RPFRL/B 570 mA
1786-RPFRXL/B 570 mA
1786-RPCD 400 mA
IMPORTANT The 1786-RPFRL/B and 1786-RPFRXL/B repeater modules require 570 mA
each, therefore you can attach only two of these modules to a
1786-RPA/B repeater adapter.
Regardless of repeater module current draw, you are limited to a
maximum of four repeater modules per repeater adapter.