Topology With Integrated Optical Interfaces - Siemens SIMATIC NET PROFIBUS Owner's Manual

Topologies of SIMATIC NET PROFIBUS Networks
2.2.1

Topology with Integrated Optical Interfaces

The optical PROFIBUS network with nodes having an integrated FO interface is
structured as a bus topology. The PROFIBUS nodes are interconnected in pairs
by duplex fiber-optic cables.
Up to 32 PROFIBUS nodes with integrated FO interfaces can be connected in
series in an optical PROFIBUS network. If a PROFIBUS node fails, the bus
topology means that all DP slaves on the side away from the DP master are no
longer obtainable for the DP master.
S7-400 with IM 467 FO
PG/PC/OP
2
1
OBT
À Terminating resistor activated
1 FO cable
2 LAN cable for PROFIBUS
Figure 2-2 PROFIBUS DP Network with Nodes Having Integrated FO Interfaces
For short distances, the preassembled 830-1T or 830-2 connecting cables can be
used as an alternative to the PROFIBUS cable.
Transmission Rate
An optical PROFIBUS network with a bus topology can be operated at the
following transmission rates:
9.6 Kbps, 19.2 Kbps, 45.45 Kbps, 93.75 Kbps, 187.5 Kbps, 500 Kbps, 1.5 Mbps
and 12 Mbps
2-6
ET 200M with
IM 153-2 FO
1
Distances between 2
nodes:
Plastic FO cable up to 50 m
PCF FO cable up to 300 m
S7-300
2
1
OBT
other
nodes
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
OP 25
À
2