Networking
5-23
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Optical PROFIBUS-DP Network in Partyline Topology
The optical PROFIBUS-DP network with nodes that have an integrated fiber-optic
cable interface has a partyline topology.The PROFIBUS nodes are
interconnected in pairs by means of Duplex fiber-optic cables.
Up to 32 PROFIBUS nodes with a fiber-optic cable interface can be
series-connected in an optical PROFIBUS-DP network. If a PROFIBUS node fails,
as a result of the partyline topology none of the downstream DP slaves can be
accessed by the DP master.
Programming
device/PC/OP
PROFIBUS
cable
OpticalPROFIBUS-DP
Distancesbetween 2
nodes:
Plasticfiber-optic cable up
to50 m
PCFfiber-optic cable up to
300m
OBT OBT
S7-400 with IM 467 FO ET200M with
IM 153-2 FO
Other field devices without
fiber-optic cable interface
Other
nodes
Figure 5-13 Optical PROFIBUS-DP Network with Nodes that have an Integrated Fiber-Optic Cable
Interface
TransmissionRate
The following transmission rates are possible when the optical PROFIBUS-DP
network is operated with a partyline topology:
9.6 kbps
19.2 kbps
45.45 kbps
93.75 kbps
187.5 kbps
500 kbps
1.5 Mbps
12 Mbps