Vega FIELDBARRIER Bedienungsanleitung PDF herunterladen (Seite 23)

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 67799091 • Internet http://www.pepperl-fuchs.com

08/2007 122329

The cable length on an output can be up to 120 m and is operated without a fieldbus

terminator. The outputs meet the requirements of both PTB Report W-53 (FISCO

model) and the requirements of the Entity concept. For additional information on this

subject, please refer to chapter 5.2.1

The technical data can be found in the data sheet.

Using the FieldBarrier offers the following advantage:

• Limiting the short-circuit current on the output means that only the affected output

will fail if there is a short circuit between the FieldBarrier and field device(s). The

fieldbus segment continues working.

• Only power repeaters/segment couplers without an intrinsically safe interface are

required in addition. This reduces the number of power repeaters/segment cou-

plers that are required.

• No additional junction boxes are required.

Using the "increased safety“ explosion protection type causes the maximum permis-

sible current on the EEX e side to be limited only by the power repeater (for a FOUN-

DATION fieldbus) or segment coupler (for PROFIBUS MBP) that is used.

Depending on the power repeaters/segment coupler that is used, the current con-

sumption of field devices and the current consumption of the FieldBarriers, it may be

possible to operate more field devices on a fieldbus segment.

Figure 6.1: Block diagram of the FieldBarrier

green

red red red red

Main cable

Output 1 Output 2 Output 3 Output 4

Connections for the non-intrinsically safe

fieldbus segment

Connections for intrinsically

safe fieldbus devices

Trunk IN Trunk OUT

S1: Fieldbus termination, switchable

Outputs

12S

1234

11-10+

5S3+4-

1B2B

6S8+7-

U, I

15S14-13+

U, I

18S17-16+

U, I

21S20-19+

U, I

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 35 36

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