Rockwell Automation 57C570 AutoMax PC3000 User Manual User Manual
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control cabinet with RGĆ11/U connecting the various cabinets
together. If RGĆ59/U and RGĆ11/U cables are mixed, each foot of
RGĆ59/U should be treated as a six foot length of RGĆ11/U for overall
network length calculations. For example, to calculate the overall
network length where 1000 feet of RGĆ11/U and 100 feet of RGĆ59/U
are required, the 100 feet of RGĆ59/U would be treated as 600 feet of
RGĆ11/U. Therefore, overall network length would be considered as
1600 feet of RGĆ11/U.
For specific applications (e.g., high temperatures), use cables
equivalent to Belden 9259 or Belden 8213 regarding electrical
characteristics, etc., as specified in Appendix C.
3.3.3
Planning for Installation
The DCSĆNET network is designed to be userĆconstructed and
installed. This enables the network system to be tailored to suit
specific needs. Therefore, plan the cable installation carefully before
attempting the actual installation (i.e., pulling and cutting cable,
terminating with connectors, etc.). The time and effort spent on cable
installation will be insignificant compared to the time and effort
required to locate and repair damaged or improperly installed cables,
connectors, or other cable system components.
The following procedure is recommended to design a cable system
that will achieve maximum signal isolation and cable protection in a
specific environment with minimum cable usage.
Step 1.
Identify the actual location of the AutoMax racks using an
equipment floor plan.
Step 2.
Identify the preliminary cable route. Route cables to allow
easy access in the future. Cable should be readily
accessible when new drops are added, existing drops are
moved to new locations, or maintenance is performed.
Step 3.
Identify the environmental conditions (electrical noise
levels, temperature, humidity, exposure to hazardous
chemicals, etc.) along this route.
Step 4.
Determine how to bypass physical and environmental
obstacles (walkways, induction heat sources, furnaces,
caustic chemical operations, steam and condensation
lines, etc.) along this route.
Step 5.
Determine the best type of cable installation (conduit,
raceway, or equivalent) for all cable segments along the
path.
Step 6.
Calculate the total cable length. Note that the cable path
distances should be considered in three dimensions.
Step 7.
Select the proper cable type (RGĆ59/U or RGĆ11/U).
Step 8.
Document the cable layout. This document should
describe the network cable system design and installation
and should be maintained throughout the life of the
network. The document should include charts showing
routes of all cable segments, locations of cable splices, as
well as drop locations and their addresses. This
information should be detailed enough to trace a signal
path between any two points in the cable system in the
event of a network failure or suspected problem.