
6-11
Cabling and Wiring the System
SIMATIC 545/555/575 System Manual
• Tap connections on the trunk line should be spaced, on average, so that
the total length of trunk cable separating several taps is greater than
the sum of the total length of drop cables connected at the taps. See
Figure 6-5.
L
3
> (L
1
+ L
2
)
T T
Remote
Base
Remote
Base
L
1
L
2
L
3
Figure 6-5 Spacing between Taps
• The ideal cable installation is a single, unbranched trunk line with
short drop cables and a termination resistor at each end of the trunk.
NOTE: For installations with five or fewer connections, if the cable length
between the controller and the most distant RBC is less than 100 feet (30m),
any cable configuration can be used. Always use at least one termination
resistor, even with the simplest installation.
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