Rockwell-automation 1788 NetLinx Media Checker Users Manual Instrukcja Użytkownika Pobierz pdf (Strona 30)

Calculating Trunk, Drop, or Tap Lengths

1788-UM002A-US-P – April 2000

ControlNet Length Calculations

Measured tap lengths depend on whether the taps are terminated or not. See Table 12.

Formulas:

• Trunk length = Measured length – Total measured length of taps

• Total tap length = Measured length – Trunk length

Example 1: Calculating trunk length

A cable measures 750 ft long and has 16 unterminated taps.

From Table 12, 16 unterminated taps = 69 measured ft

Trunk length = 750 ft measured length – 69 ft tap length = 681 ft trunk length

Example 2: Calculating total tap length and the number of taps

A cable measures 328 m long. The actual cable length is 274 m. The taps on the cable are terminated.

Measured (terminated) total tap length = 328 m – 274 m = 54 m

From Table 12, 54 meters of terminated taps corresponds to 23 taps.

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Rockwell-automation 1788 NetLinx Media Checker Users Manual Instrukcja Użytkownika Strona 30