Vega FIELDBARRIER Bedienungsanleitung PDF herunterladen (Seite 14)

FieldBarrier

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

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5 General

5.1 Range of application of the FieldBarrier

FieldBarriers can be used in combination with fieldbus systems that use the "Man-

chester Coding Bus Powered“ physical layout in accordance with IEC 61158-2. This

includes the H1 bus of the FOUNDATION fieldbus and the PROFIBUS MBP, for ex-

ample. FieldBarriers ensure galvanic isolation between a non-intrinsically safe and an

intrinsically safe fieldbus segment.

The advantage of the transmission physics in accordance with IEC 61158-2 is that

power can be supplied to fieldbus stations from the transmission line. The supply cur-

rent required for this is made available by power repeaters or power supply units for

FOUNDATION Fieldbus and by the segment coupler for the PROFIBUS MBP or

PROFIBUS MBP-IS, which is intrinsically safe version of the PROFIBUS MBP.

The following diagram illustrates a typical fieldbus structure in combination with Field-

Barriers

Figure 5.1: Typical field bus structure of intrinsically safe applications

5.2 Introduction to intrinsic safety for fieldbus systems

If fieldbus systems are used in hazardous areas, the corresponding explosion protec-

tion measures must be taken. The Intrinsic Safety explosion protection method offers

Both the H1 bus of the FOUNDATION fieldbus and the PROFIBUS

MBP use the physical layout described above in accordance with IEC

61158-2. The FieldBarrier can be used for both systems. When the fol-

lowing section refers to the H1 bus, this should be understood to

include both the H1 bus of the FOUNDATION fieldbus and the PROFI-

BUS MBP!

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Vega FIELDBARRIER Bedienungsanleitung Seite 14