5 Communication
5.1 PROFIBUS-PA interface
Note!
Additional specification details about PROFIBUS-PA Profile 2.0 fieldbus can be found
in Operating Manual BA 198F/00/en “Field Communication PROFIBUS-DP/-PA:
Guidelines for planning and commissioning”.
General
Prowirl 77 (PROFIBUS-PA version) has a PROFIBUS-PA interface according to the
fieldbus standard PROFIBUS-DP, EN 50170 Volume 2.
This enables it to exchange data with process control systems which comply to
this standard. Integrating into a control system must be in accordance with the
specifications for PROFIBUS-PA profiles.
Transmission partner
Prowirl 77 always acts as a slave in a control system and, depending on the type of
application, can therefore exchange data with one or several masters.
The master can be a process control system, a PLC or a PC with a PROFIBUS-DP
plug-in communication board.
Note!
In project management, note that the Prowirl 77 current consumption is 12 mA.
Caution!
In order to protect the PROFIBUS-PA segment from the effects of any serious faults
occurring in the instrument (e.g. short circuiting), the IEC 61158-2 interface is fitted
with a safety fuse. When the fuse is activated, the instrument is permanently sepa-
rated from the bus. The electronics must then be replaced.
Segment coupler
PLC
31.25 kbit/s
31.25 kbit/s
Safe area
Ex area
PROFIBUS PA
Process control system
Commuwin II
IEC 1158
IEC 1158
RS 485
ba037y37
Fig. 12
Principle of PROFIBUS-PA
Note!
Note!
Caution!
Prowirl 77 PROFIBUS-PA 5 Communication
Endress+Hauser 17
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