Siemens Automation System S7-400 - Manual (Page 121)

Networking
5-23
Automation System S7-400 Hardware and 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
Optical PROFIBUS-DP
Distances between 2
nodes:
Plastic fiber-optic cable up
to 50 m
PCF fiber-optic cable up to
300 m
OBT OBT
S7-400 with IM 467 FO ET 200M 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
Transmission Rate
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