Siemens EF 83H Series Manual de usuario Pagina 43

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Connecting the Network
3-5
SIMATIC 505 PROFIBUS-FMS CP User Manual
3.2 Cable Routing
Follow
these suggestions when planning your cable routing.
Allow for system growth. Provide for attachment of future bases by
routing cable through all possible areas of plant expansion.
T
ake steps to bypass or eliminate noise sources in order to reduce
system data error rates. The following are common sources of electrical
noise:
Power distribution mains
Arcing motors and motor starters
Fluorescent lighting
Undesired signal transfer between adjacent circuits
Poor terminations of cable connector
Do not allow cable to come into contact with any other electrical
conductor.
If cabling is installed inside a conduit, the conduit should be grounded
according to applicable electrical codes.
The type of routing is usually determined by the type of building in which
the cables are being installed. Any combination of the following may be used
to route the cables: under
-floor
, in-ceiling, or surface duct.
!
WARNING
Electrical
and fire safety must be considered in planning the installation.
Safety codes exist to limit the danger of fire and smoke hazards caused by
cable installations.
T
o ensure safety compliance, observe local installation code guidelines.
In
under
-floor routing, the cable can be enclosed in ducts or
, with raised
flooring, in the open air
.
Duct systems are better protected against unauthorized taps or
terminal blocks, but expansion is more difficult and expensive than
with open air systems.
Open air systems provide more freedom of access, and allow maximum
system expansion flexibility
.
Guidelines
Cable Routing
Methods
Under-Floor
Routing
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