Lenze E84DGFCP Bedienungsanleitung PDF herunterladen (Seite 25)

EDS84DMOTPBUS EN 3.0 - 11/2011 L 25

Communication manual 8400 motec PROFIBUS

Installation

Electrical installation

5.2.3 Bus cable specification

Bus cable length

The bus cable length depends on the baud rate used:

 Tip!

For high baud rates, we recommend taking the use of optical fibres into

consideration.

Advantages of optical fibres:

• External electromagnetic interferences have no effect on the transmission

path.

• Bus lengths of several kilometres are also possible with higher baud rates.

The bus length is ...

– independent of the baud rate;

– dependent on the optical fibre used.

 Note!

Only use cables that correspond to the given specifications of the PROFIBUS user

organisation.

Area Values

Cable resistance 135 ... 165 Ω/km, (f = 3 ... 20 MHz)

Capacitance per unit length ≤ 30 nF/km

Loop resistance < 110 Ω/km

Core diameter > 0.64 mm

Core cross-section > 0.34 mm

Cores Twisted in pairs, insulated and shielded

Baud rate Length

9.6 ... 93.75 kbps 1200 m

187.5 kbps 1000 m

500 kbps 400 m

1500 kbps 200 m

3000 ... 12000 kbps 100 m

 Note!

The baud rate depending of the data volume, cycle time and number of stations

should only be selected as high as required for the application.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 99 100

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