Profibus; Optical Network - Siemens SIMATIC S7-400H Manual

Communication Functions

Optical network

The optical industrial Ethernet network (transmission medium: fiber-optic cable)
can be configured as a line-type, ring or star network. The configuration is
accomplished for a transmission rate of 10 Mbps with optical link modules (OLMs)
and/or star hubs for the fast Ethernet of 100 Mbps with optical switching modules
(OSMs) and optical redundancy manager (ORM).
8.2.2

PROFIBUS

PROFIBUS is a communications network for cells and fields in accordance with
PROFIBUS Standard EN 50 170, Volume 2, with the hybrid token bus and master
slave access procedure. Networking takes place over two-wire cables or fiber-optic
cables.
The PROFIBUS bus system can be used as a redundant medium with electrical or
optical components. The number of connected stations should not exceed 30. An
Industrial Ethernet bus system is recommended for larger plants.
The transmission rate can be adjusted in steps from 9.6 kb's to 12 Mbps.
8-6
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07