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PFA, BGT · Edition 03.11l
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Project planning information
6 .3 Wiring
Integrate module subracks BGT in the equipotential
bonding system.
6 .3 .1 Safety-related control signals
Signals from the safety interlocks and digital input are
transferred independently of the bus communication
by separate cables.
The purge signals can be transferred via the bus com-
munication or by a separate cable.
6 .3 .2 EMC
To achieve a high immunity of the system against elec-
tromagnetic interference radiation, a shielded data
cable must be used. The shield must be connected to
protective earth on both sides using wide-area shield
clips that ensure good conductivity.
In addition, it must be ensured that all cables leading to
and from the PFA be installed as far away as possible
from cables emitting strong fields (e.g. frequency con-
verter cables).
6 .3 .3 PROFIBUS plug connector
PROFIBUS-DP
A B A’ B’
OFF
ON
OFF
ON
Data cables A and B must not be reversed.
The power supply for the bus terminator is provided by
the PFA. The bus terminator can be connected in the
PROFIBUS plug connector.
Ensure an equipotential bond between the different
slaves and masters.
Bibliography
– PROFIBUS Specification, EN 50170 Vol. 2 (version
1.0).
– Installation Guideline for PROFIBUS DP/FMS, avail-
able from the Profibus User Organization (PUO).
– PROFIBUS Technology and Application, Order No.:
4.001, available from the PUO.
– M. Popp, The New Rapid Way to PROFIBUS DP, a text-
book for system operators.
– M. Popp, PROFIBUS DP Principles, Tips and Tricks for
Users.
– www.profibus.com
6 .4 Manual operation
For emergency operation, the time-limited manual
mode can be deactivated.
The PFA is delivered with manual mode pre-set to a
time limit (parameter 34 = 1).