6
ControlNet Fiber-optic Ring Repeater Modules
Rockwell Automation Publication 1786-IN003D-EN-P - April 2011
WARNING:
Hazardous areas require the use of specially designed
products. Only when the product is marked accordingly (see the
product ID label) it may be used in Class I Division 2 hazardous
environments. Rockwell Automation provides similar products that
are intrinsically safe and are suitable for more hazardous
environments. Use the appropriate products that are designed for
the specific hazardous environments that your installation requires.
In intrinsically-safe applications, consult with your local safety
coordinator because you need specific products on both ends of the
fiber link. Refer to the ControlNet EX Media Planning and
Installation Manual, publication
CNET-IN003
.
TIP
You must use an adapter module (1786-RPA/B) with the
1786-RPFRL/B or 1786-RPFRXL/B modules to provide power to all
repeaters, and control the flow of data from one repeater to
the next.
IMPORTANT
The distance between repeaters that can be supported is
dependent on the quality of the fiber, number of splices, and
connectors. The total loss of the fiber link must be less than
15 dB for the 1786-RPFRL/B module and 10.5 dB for the
1786-RPFRXL/B module.
The total size of the ring or length of the copper and fiber
ControlNet network is limited by the ControlNet protocol to
20 km or less. Refer to Determine Maximum Network Length
on
page 21
for more information.
To determine the maximum distance between any two fiber
modules, refer to the table on
page 19
.