KROHNE OPTITEMP TT 60 C-R EN - Manual (Page 15)

11/2010 – 4000754401 – MA OPTITEMP TT60CR R01 en www.krohne.com 15
4.3.3 Terminator
The ProfiBus cable must be terminated at both ends.
The terminator consists of a capacitor and a film resistor connected in series.
Values
R = 100 Ω ± 2%
(T)
C = 1 µF ± 20%
4.3.4 ProfiBus architecture
Figure 6: Typical ProfiBus architecture
1
ProfiBus DP components
2
DP/PA segment coupler with 3 and 4
3
Signal coupler
4
Power supply
5
Connection box
6 PA segment
7
Bus terminator
8
Field devices
The illustration above shows a typical ProfiBus architecture. Field devices with low power
consumption (e.g. pressure and temperature transmitters) are fed via the two-wire bus. Signal
transmission is likewise via the bus.
In the case of installations in areas without potentially explosive atmospheres, up to 32 devices
can be connected per segment, depending on the power rating of the segment coupler.
In the case of installations in areas with potentially explosive atmospheres, normally 10 devices
can be connected per segment.