Attaching Rs-485 Segments - Siemens SIMATIC NET PROFIBUS OBT Manual

4.3

Attaching RS-485 Segments

The OBT allows the attachment of a PROFIBUS-RS 485-segment.
ET 200M without
FO interface
À
2)
3)
2)
À Terminating resistor activted
1) PROFIBUS cable
(terminated at both ends)
2) PROFIBUS cable
3) PROFIBUS connector (not terminated)
4) Plastic FO or PCF FO with two fibers
Figure 4-2
PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-03
DP node without
FO interface
À
2)
OBT
OBT
3)
4)
Example of Attaching RS-485 Segments
Network Topology
SIMATIC S7-400 ET 200M without
with IM 467 FO interface
À
1)
OBT
À
À
4)
À
1)
4-3