Local Line Tap Spacing Rules; Basic Considerations; Primary Rule; Basic Tap Spacing Rules - Siemens SIMATIC TI500 User Manual

Network Media Installation — Local Line (continued)
Local Line Tap
Spacing Rules
Basic
Considerations

Primary Rule

2-8 Network Installation
Local Line networks must adhere to specific tap spacing requirements to
maintain signal integrity. These requirements are outlined in the following
sections.
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Figure 2-5 Basic Tap Spacing Rules
The rules for determining the correct distances between taps exist simply
for the prevention of signal degradation caused by reflections.
Prior to configuring the distances between taps in the network cable, select
a single tap as a physical point to use as reference. This tap should be one of
the taps on the end of the network.
The primary rule is that the minimum distance from one tap to the next
cannot be less than one half the distance of the previous tap cable
(drop line) length. This rule should be applied starting at the first tap on the
network all the way to the end. Then, from the last tap on the network, the
same rule should be applied back to the first tap again.
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