SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
209
Glossary
Analog
Continuous representation of a variable, e.g. voltage, using a scale, in contrast to "Digital".
ATEX
ATEX stands for both the directives of the European Community for the field of explosion
protection: the ATEX product directive 94/9/EC and the ATEX operation directive
1999/92/EC.
Automation system
An automation system is a programmable logic controller consisting of at a central
processing unit, a variety of input and output modules as well as operator control and
monitoring (HMI) devices.
Bus
A cable or conductor system used for data transfer among the components of a computer
system. Buses are characterized by the number of bits they can transfer at any one time.
There are serial bus systems (one bit after the other) and parallel bus systems (multiple bits
simultaneously over several lines).
CSA
The Canadian Standards Association sets standards for North America. The CSA also
certifies products used in hazardous areas.
Digital
Representation of a variable, e.g. time, in the form of characters or numbers. In its digital
representation, this variable can be changed only in pre-defined steps, in contrast to
"Analog".
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