34 Electrical installation
Switching on the bus termination
Bus termination is required to prevent signal reflections from the
bus cable ends. The adapter module is not equipped with internal
bus termination. Therefore, the D-SUB connectors at the first and
last modules of the bus must have built-on termination switched on
as shown in the diagram below.
The adapter module is able to supply power for an active-type
termination circuitry (30 mA max.).
Note: Further information on PROFIBUS wiring is available from
the publication PROFIBUS RS 485-IS User and Installation
Guideline (www.profibus.com
, order no. 2.262).
PROFIBUS
device
ON
PROFIBUS
device
OFF
PROFIBUS
device
ON
PROFIBUS
device
OFF
Term. Term. Term. Term.
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