Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual - Manual (Page 26)

Publication CNET-IN003A-EN-P - January 2006
2-4 Plan a ControlNet Ex Media System
Fiber Media Type Fiber media type specifications are listed below.
•
Fiber type 62.5/125
µ
•
Connector type ST (plastic or ceramic)
•
Operating wavelength 1300 nm
•
Optical power budge 13.3 dB
You should install all fiber for your ControlNet Ex cable system in
accordance with the regulations contained in applicable country
codes, state codes, and applicable municipal codes (for example,
National Electric Code). All metal connectors must be insulated
from the ground. Use blue ControlNet cable or the ControlNet Ex
Cable Marking Kit (1797-EXMK) to mark cable as intrinsically-safe.
When you use the 1797-EXMK, be certain to place one marker at
every meter of length.
Determine Trunk Cable
Section Lengths A segment is comprised of several sections of trunk cable separated
by taps. The total cable length of a segment is equal to the sum of all
of the trunk cable sections, including taps.
The total allowable length of a segment containing standard RG-6
quad-shield cable depends upon the number of taps in your
segment. There is no minimum trunk cable section length
Trunk Terminator
With
Intrinsically-safe
Insulator
Trunk Cable Section Trunk Cable Section
Tap Tap Tap
30094-m
Trunk Terminator
With
Intrinsically-safe
Insulator
IS Insulators
TIP
When determining the length of trunk cable sections,
measure the actual cable path as it is routed in your
network. Consider vertical dimensions as well as
horizontal dimensions. You should always calculate
the three-dimensional routing path distance when
determining cable lengths.
Cover all exposed metal on connectors with either
the intrinsically-safe insulators or other forms of
insulation.
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.