Lenze E94AYCPM Manuel d'utilisateur télécharger pdf (Page 26)

5 Installation

5.2 Electrical installation

Lenze · E94AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 12.0 EN · 11/2012 · TD17

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5.2.3 Bus cable specification

Bus cable length

The length of the bus cable depends on the baud rate and cable type used. The data in the following

table applies to PROFIBUS cables of "FC-Standard Cable" cable type .

 Tip!

We recommend taking the use of optical fibres into consideration for high baud rates.

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 which meet the listed 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 ... 21 22 23 24 25 26 27 28 29 30 31 ... 124 125

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Lenze E94AYCPM Manuel d'utilisateur Page 26