Endress+Hauser PROline promag 53 II3G Mise En Service page 36


PROline Promag 53 FOUNDATION Fieldbus
Network configuration for FOUNDATION Fieldbus H1
General remarks
Various aspects are to be considered when configuring a FOUNDATION Fieldbus H1
segment and these must essentially be checked by a general type of consideration:
Functional considerations
In the functional considerations, the characteristic of the technical function data laid
down in IEC 61158-2 for the transmission technology of the FOUNDATION Fieldbus H1
and the physical network structure is checked. Here it must always be ensured that the
total base currents of all bus participants does not exceed the maximum permissible
feed current of the bus power supply and that the field devices are always supplied with
a minimum bus voltage of 9 V.
Configuration example for a FOUNDATION Fieldbus H1 segment
The following is an example of the functional safety considerations calculations for the
design of a FOUNDATION Fieldbus H1 segment using the above mentioned aspects.
Fig. 6 shows the typical structure and the associated components. Field devices with a
lower power consumption, such as the Cerabar S pressure gauge, are supplied via the
two-wire line. In contrast, the Promag 53 as a four-wire device must be supplied via an
external power supply.
Fig. 6: Typical example of a bus connection with a fieldbus power supply of type MTL 5995
1 = DCS with integrated FOUNDATION Fieldbus H1 interface card
2 = fieldbus power supply, model MTL 5995
3 = Promag 53 bus devices for hazardous area
4 = terminator (T) = bus termination
5 = transducer supply
6 = Cerabar S bus devices for hazardous area
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