SIMATIC NET PROFIBUS, Optical Link Module
Operating Instructions, 07/2008, A2B00065774O, Edition V1.5
3
2
Introduction
2
2.1
Introduction
This section provides you with an overview of the functions of the PROFIBUS OLM4.0
product family.
What is possible?
PROFIBUS OLMs are designed for use in optical PROFIBUS fieldbus networks. They
allow the conversion of electrical PROFIBUS interfaces (RS-485 level) into optical
PROFIBUS interfaces and vice versa.
The modules can be integrated in existing PROFIBUS fieldbus networks with the known
advantages of optical transmission technology. A complete PROFIBUS fieldbus network
can also be set up with modules in a linear (bus), star or ring topology as well as any
combination of these topologies.
To increase the reliability of the fieldbus network in case of failure, the redundant ring is
supported.
Figure
2-1
PROFIBUS OLM with position of all interfaces, displays and adjustment options
LED displays
Channel 1
RS-485
DIL switch for
modes
Operating voltage
Signaling contact
Sockets for
measuring levels of
the optical interfaces
(see section 5.6).
Channel 2 Channel 3
Optical channels
