Siemens sitrans tr300, Manual

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SITRANS TR200/TR300
Operating Instructions, 06/2010, A5E01071992-03
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Glossary
Analog
One variable, e.g. voltage which is infinitely adjustable, in contrast to "Digital".
ATEX
ATEX is an abbreviation of the French term "Atmosphère explosible" (potentially explosive
atmosphere). ATEX stands for both EC directives in the area of explosion protection: ATEX
product directive 94/9/EC and ATEX operating directive 1999/92/EC.
Auxiliary power supply
Auxiliary power supply is an electrical supply voltage or reference voltage, such as many
electrical circuits require in addition to the standard power supply.
The auxiliary power supply is specially stabilized, has a specific level and polarity and/or has
other properties that are important for correct operation of circuit components.
Auxiliary voltage
→
Auxiliary power supply
CE
Communautés Européenes: European communities
Dangerous failure
Failure with the potential to bring the safety-instrumented system into a dangerous or non-
functional status.
DC
Direct Current: Direct Current
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".
DIN
Deutsches Institut für Normung e. V. - German institute for standardization