PROFIBUS-DP RS485 Installation / Pre-commissioning
TR-Electronic GmbH 2011, All Rights Reserved
Printed in the Federal Republic of Germany
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TR - ECE - BA - DGB - 0089 - 04
02/03/2016
5 PROFIBUS-DP RS485 Installation / Pre-commissioning
All devices are connected in a bus structure (line). Up to 32 subscribers (master or
slaves) can be connected together in a segment.
The bus is terminated with an active bus termination at the beginning and end of each
segment. For stable operation, it must be ensured that both bus terminations are
always supplied with voltage. Dependent of the device type the bus termination can be
installed already in the device itself, otherwise the bus termination must be installed
external, see nameplate.
●
Cabling must be performed according to DIN EN 60079-14; VDE 0165-1:
“Explosive atmospheres - Part 14: Electrical installations design, selection and
erection
”.
●
Fieldbus isolating repeaters
(signal amplifiers) only have to be used with more
than 32 subscribers or to expand the network scope in order to connect the
various bus segments.
●
The PROFIBUS transmission speed may be set between 9.6 kBit/s and 12 Mbit/s
and is recognized by the measuring system automatically. It is selected for all
devices on the bus at the time of commissioning the system.
However, using in explosive areas the maximum transmission rate has to
be limited to 1.5 Mbit/s.
A shielded data cable is used to achieve high electromagnetic interference stability.
The shielding should be connected with low resistance to protective ground using
large shield clips at both ends. It is also important that the data line is routed separate
from power current carrying cables if at all possible.
To ensure safe and fault-free operation, the
-
PROFIBUS Installation Guideline for Planning, Order-No.: 8.012
-
PROFIBUS Installation Guideline for Cabling and Assembly, Order-No.: 8.022
-
PROFIBUS Installation Guideline for Commissioning, Order-No.: 8.032
-
and the referenced Standards and PNO Documents contained in it must be
observed!
In particular the EMC directive in its valid version must be observed!
