Siemens SIMATIC NET PROFIBUS - Manual (Page 32)

Topologies of SIMATIC NET PROFIBUS Networks
2-6
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
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.
PG/PC/OP
2
Distances between 2
nodes:
Plastic FO cable up to 50 m
PCF FO cable up to 300 m
OBT OBT
S7-400 with IM 467 FO ET 200M with
IM 153-2 FO S7-300
other
nodes
1
1 FO cable
2 LAN cable for PROFIBUS
1
1
2
OP 25
А
А
Terminating resistor activated
2
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