Siemens SIMATIC NET PROFIBUS manual Introduction

1 Introduction

1 Introduction

The PROFIBUS OLM (Optical Link Module) product family consists of

OLM/P11,

OLM/P12,

OLM/G11,

OLM/G12,

OLM/G12-EEC,

OLM/G11-1300 and

OLM/G12-1300.

PROFIBUS OLMs are designed to be used in optical PROFIBUS field bus networks. They enable electrical PROFIBUS interfaces (RS 485 level) to be converted into optical PROFIBUS interfaces and vice-versa.

By profiting from the familiar advantages of optical transmission technology, the modules can be integrated into existing PROFIBUS field bus networks. A complete PROFIBUS field bus network with modules in line, star or ring topology, and an arbitrary combination of these, can also be built up.

The redundant ring is also supported, thereby increasing the fail-safety of the field bus network.

Each module has two or three mutually independent ports, which in turn consist of a transmitting and a receiving component.

The device is powered by 24V DC voltage. A redundant feed increases operational safety.

The electric port is a 9-pole Sub-D socket (female). An RS 485 bus segment in line with the PROFIBUS standard EN 50170 can be connected to this port.

The optical fibers are connected using BFOC1) /2.5 connectors.

Four multicolored light-emitting diodes indicate the current operating status and possible operating malfunctions.

Operating voltage supply / signaling contact

5-pole terminal block

LED Indicators

Measuring sockets

PROFIBUS OLM

System

CH 2 CH 1 CH 2 CH 3 CH 3

Receive

Signal

Intensity

GND

Port 1 electric, Sub-D socket

CH 1

Port 2	Port 3
optical,	optical,
BFOC/2.5	BFOC/2.5
socket	socket

Fig.1: PROFIBUS OLM module showing the location of the LED indicators, measuring sockets and the individual ports.

1)BFOC stands for Bayonett Fiber Optic Connector.

This connector type is functionally compatible with ST ® connectors. ST is a registered trademark of AT&T.

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