INOR PROFIPAQ-L - Manual (Page 35)

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7.2 Termination
Bus line termination [T] consists of a series circuit of one capacitor and one film resistor
in both ends of the main bus line.
Permissible values:
R = 100 Ω ±2 %
C = 1
µF ±20 %
It is common that one of the Line terminations is included in the Segment Coupler.
Figure 31 Typical fieldbus architecture.
1 ProfiBus DP Component
2 DP / PA Segment Coupler (including 3 and 4)
3 Signal coupler
4 Power supply device
5 Junction boxes
6 PA Segment
7 Bus line termination
8 Field devices
Figure 31 shows a typical PROFIBUS architecture. The field devices with low power
consumption (e.g., pressure and temperature measuring transmitters) are powered by a
two-wire bus. Signal transmission is also performed over the bus. A non ex-installation
allows up to 32 devices per segment, depending on the power capacity of the segment
coupler. In an Ex-installation normally 10 units can be connected in each segment.
For more information concerning PROFIBUS installation, see the PROFIBUS homepage
www.profibus.com .