Notation; On The Contents - IFM Electronic Efector 200 Training Manual

Photoelectric sensors
Headwords
What does FAQ mean?
( 4)
1. Introduction
2. Light
3. Characteristics of the photoelectric sensors
4. Examples of units
Training manual
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1.2

Notation

The notation is explained here to make it easier to read the text and to
find information.
Headwords are indicated at the left margin. They give information on the
topic in the following paragraph.
It means Frequently Asked Questions. This term is often used for modern
electronic media. Almost every beginner of a new topic has the same
questions. Sometimes they can be found at the beginning of a paragraph
instead of a headword. They are written in italics to distinguish them
from simple headwords.
A number in round brackets at the left margin indicates a formula that is
referred to later in the text, e.g. see ( 4). Of course these formulas need
not be learned by heart. They are to facilitate the understanding of the
matter because like a figure a formula describes the context in a shorter
and clearer way than many words.
1.3

On the contents

This manual describes the principles of the photoelectric sensors.
Important terms and correlations are explained, state-of-the-art
technology is described and technical data of the units are given. This
results in the following structure.
This introduction is followed by the chapter:
This chapter contains a short description of the physical principles which
are useful for a better understanding of the functioning and the
characteristics especially of laser and infrared units. Some basic terms and
their correlation are described.
Characteristics of binary sensors are discussed. Other more complex
systems that are also used in practice are mentioned. A general overview
of the different sensor systems follows. Among others, this is to facilitate
a correct classification of photoelectric sensors as well as the decision
where they can be used and where not. Afterwards the three sensor
versions and their specific features are presented. The knowledge of
these features, the advantages and disadvantages, is a prerequisite for a
useful discussion with users.
In this chapter the data of sensors are given and explained. The
mechanical structure, the optical and electrical characteristics, the use
and the setting of the range are described here. In addition some
applications are presented.
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