3
ELECTRICAL CONNECTION
8
H250 M40 ESK4
www.krohne.com
03/2014 - 4002251801 - AD H250/M40 PROFIBUS R01 en
Electrical connection
3.1 Topology of a PROFIBUS PA network
The following diagram shows a typical network configuration with PROFIBUS PA devices in
hazardous and non-hazardous areas, as well as the connection of conventional non-PROFIBUS
devices (e.g. with 4
…
20 mA signals) to a PROFIBUS network.
The PROFIBUS PA segment is connected to a segment coupler which, among other things,
provides the conversion to the PROFIBUS DP bus line. In addition it provides the power supply for
bus
–
powered PROFIBUS PA devices. Refer to the instruction manual of the segment coupler
concerning the DP bus parameters, e.g. the supported baud rates.
Refer also to the PROFIBUS PA User and Installation Guideline (Version 2.2, February 2003 PNO
Order No. 2.092).
Figure 3-1: PROFIBUS PA network
1
Control system (PLC); class 1 master
2
Engineering or operation control tool; class 2 master
3
PROFIBUS DP network with max. 12 Mbit/s
4
PROFIBUS PA segment coupler DP / PA
5
PROFIBUS PA network with 31.25 kbit/s
6
HART
®
device
7
More devices with 4
…
20 mA
8
Analogue I/O module
AD_H250_M40_PB_PA_R01_en_4002251801_PRT.book Page 8 Friday, March 21, 2014 1:14 PM
