Vega FIELDBARRIER Bedienungsanleitung PDF herunterladen (Seite 18)

FieldBarrier

Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany

Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com

08/2007 122329

The recommended network expansion is equal to the sum of the trunk and all spurs.

A fieldbus station works from an input voltage of 9 V, i. e. this value corresponds to

the minimum input voltage.

With an unfavorable distribution of stations, i.e. if all fieldbus stations are widely re-

moved from the segment coupler/power repeater, it can happen that the voltage drop

along the line is so great that the voltage level at the end is insufficient. This results in

a shortening of the transmission line or the necessity of using cable with a larger

cross-section. Under unfavorable conditions, the following lengths can be achieved

with cable type A (0.8 mm² or AWG 18):

• Application EEx ia IIC ==> 860 m

• Non-Ex application ==> 852 m

The fieldbus allows for spurs. The length of each spur is determined by the number

of fieldbus stations, the number of field devices per spur and the range of application.

The following table shows an overview:

For cable type B, multiple fieldbus segments can be carried in one cable. If other types

of cable than those recommended are used, the permissible line lengths are reduced.

Please note the specifications of the FieldBarrier. For more detailed

information, please refer to chapter 6.3.

Number of

communication

members

Maximum spur length for non-Ex applications

1 device per

spur

2 devices per

spur

3 devices per

spur

4 devices per

spur

1 to 12 120 m 90 m 60 m 60 m

13 to 14 90 m 60 m 30 m 1 m

15 to 18 60 m 30 m 1 m 1 m

19 to 24 30 m 1 m 1 m 1 m

25 to 32 1 m 1 m 1 m 1 m

Please note that the permissible total line length (the total of the trunk

and all spurs) must not be exceeded.

For Ex applications the spur length is limited to 60 m per spur.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 35 36

Keine Kommentare

Vega FIELDBARRIER Bedienungsanleitung Seite 18