Rockwell-automation 1786-RPFRXL ControlNet Fiber Ring Modules Installa User Manual download pdf (Page 10)

10 ControlNet Fiber-optic Ring Repeater Modules

Rockwell Automation Publication 1786-IN003D-EN-P - April 2011

Fiber-optic Ring Topology

Use this configuration for long distances. A fiber-optic ring may contain as many

as 20 member modules. These member modules (four shown in Figure 2

)

include the following:

• 1786-RPA/B repeater adapter module

• 1786-RPFRL/B long-distance ring repeater module

• 1786-RPFRXL/B extra long-distance ring repeater module

Figure 2 - Fiber Ring Topology Example

TIP

You cannot exceed 20 repeater modules in a series. If a ring is

broken, whether accidentally or on purpose for testing, the

configuration then becomes linear and the number of repeaters

depends on where the ring is broken. Most likely you will have as

many repeaters as in the original ring, such as the four shown in

Figure 2.

1786-RPA

1786-RPFR(X)L

1786-RPA

CH1 CH2

1786-RPA

1786-RPFR(X)L

1786-RPA

1786-RPFR(X)L

CH1 CH2

1794-ACNR15

31237-M

On all fiber repeater modules, the leftmost connector is the RX (Receive) port;

the rightmost connector is the TX (Transmit) port.

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Rockwell-automation 1786-RPFRXL ControlNet Fiber Ring Modules Installa User Manual Page 10