Vega FIELDBARRIER Bedienungsanleitung PDF herunterladen (Seite 26)

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

• By possibility 1, the trunk is directed into the FieldBarrier through one of the EEx e

cable glands and back out through the second EEx e cable gland.

• By possibility 2, the FieldBarrier is connected to the trunk via a junction box Care

must be taken here that the connection line between the junction box and FieldBar-

rier is < 1 m.

The transmitters integrated into the FieldBarrier are used to transfer impedances con-

nected to the outputs to the trunk.

6.3 Dimensioning of a fieldbus segment

Dimensioning of a fieldbus segment is described in the

• Instruction manual/manual segment coupler.

• Instruction manual/manual Fieldbus components.

However, the calculation of maximum permissible line length described there is only

valid if each fieldbus station of a segment has a linear characteristic input curve.

To simplify dimensioning of a fieldbus segment, Pepperl+Fuchs has

developed the software tool "segmentchecker" that makes the necessary calcula-

tions. You can download this tool from the home page www.segmentchecker.com.

6.4 Terminating the trunk with a fieldbus terminating resistor.

The transmission line of a fieldbus application must be equipped with a fieldbus ter-

minator. The fieldbus resistor must be mounted in such a manner as to ensure the

longest possible line length between the segment coupler/power repeater/power con-

ditioner and the fieldbus terminating resistor.

The P+F FieldBarrier Segment Checker for FOUNDATION Fieldbus software pro-

gram shows where the fieldbus terminating resistor should be wired in.

From the point of view of the trunk, each wired output of a FieldBarrier

represents a spur.

The FieldBarrier has a non-linear characteristic input curve.

An external terminating resistor can also be used.

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Vega FIELDBARRIER Bedienungsanleitung Seite 26