Siemens SIMATIC NET PROFIBUS - Manual (Page 439)

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PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-02
Introduction
The PROFIBUS OBT (Optical Bus Terminal) is a network component for use in
optical PROFIBUS DP fieldbus networks. It allows the attachment of a single
device without an integrated optical interface to the optical PROFIBUS DP. The
following figure illustrates a typical configuration.
1) PROFIBUS cable (terminated at both ends)
2) Plastic FO cable or PCF FO cable with two fibers
PC
Programming Device
Operator Panel
SIMATIC S7-400
with IM 467 FO ET 200M with
FO interface
DP node without
FO interface
2)
1)
2) 2)
1)
OBT
OBT
А А
А
А
А
Terminating resistor activted
Figure 1-1 Example of an Optical PROFIBUS DP Configuration
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