Siemens SIMATIC TI500 Uživatelský manuál stáhnout pdf (Strana 24)

Network Installation

2-8

TIWAY I Gateway User Manual

Network Media Installation — Local Line (continued)

Local

Line networks must adhere to specific tap spacing requirements to

maintain signal integrity

. These requirements are outlined in the following

sections.

60′

100′

100′ 100′

50′ min 50

′

min 50′ 30′

20′

I000000

Figure 2-5 Basic

ap 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.

Local Line T

Spacing Rules

Basic

Considerations

Primary Rule

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Siemens SIMATIC TI500 Uživatelský manuál Strana 24