Introduction - Siemens SIMATIC NET PROFIBUS OBT Manual

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.
PC
Programming Device
Operator Panel
À
1)
OBT
À
2)
À Terminating resistor activted
1) PROFIBUS cable (terminated at both ends)
2) Plastic FO cable or PCF FO cable with two fibers
Figure 1-1 Example of an Optical PROFIBUS DP Configuration
PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-03
DP node without
ET 200M with
FO interface
FO interface
OBT
2)
SIMATIC S7-400
with IM 467 FO
À
1)
À
2)
1
1-1