ABB FPBA-01 Manual do Utilizador descarregar pdf (Página 32)

Electrical installation

32

Bus termination

Bus termination is required to prevent signal reflections from the

bus cable ends. The FPBA-01 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. See the diagram below.

The FPBA-01 module is able to supply power for an active-type

termination circuitry (30 mA max.).

Figure 3. PROFIBUS cable termination

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

Ter m . Ter m. Ter m . Ter m .

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