Beckhoff PS1011-2410-0000 - Terminology and Abbreviations

Foreword
PS1011-2410-0000 7Version: 1.0
2.2 Terminology and abbreviations
PE and the earthing
symbol
PE is the abbreviation for "protective earth" and has the same meaning as the
earthing symbol
Earth, ground This document uses the term “earth” which is the same as the U.S. term “ground”.
T.b.d. Still to be defined, value or description will follow in due course.
AC 230V A value preceded by "AC" or "DC" represents a nominal voltage or a nominal
voltage range. The nominal voltage or the nominal voltage range may be provided
with tolerances. (e.g. AC 230V ±10%). The calculated total range then indicates
the working range of the device.
Example:
DC 12V refers to a 12V battery, regardless of whether it is fully charged
(13.7Vdc) or discharged (10Vdc).
230Vac A value followed by the unit Vac or Vdc is an instantaneous value that does not
contain any additional tolerances.
50Hz vs. 60Hz Unless otherwise specified, AC 100V and AC 230V parameters are valid at a
mains frequency of 50Hz. AC 120V parameters are valid for a mains frequency of
60Hz.
may A keyword indicating a choice without implied preference.
shall A keyword indicating a mandatory requirement.
should A keyword indicating a choice with a clearly preferred method of implementation.