IEC 60027-6-2006 Letter symbols to be used in electrical technology - Part 6: Control technology

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International Standard IEC 60027-6 has been prepared by IEC technical committee 25: Quantities and units, and their letter symbols, in co-operation with the International Federation of Automatic Control (IFAC).
This standard cancels and replaces IEC/PAS 60027-6 published in 2004. This first edition constitutes a technical revision.
This part of IEC 60027 is intended to replace Clause 11 of IEC 60027-2:2000.
In comparison with Clause 11 of IEC 60027-2:2000 the following has been altered:
– the number of physical quantities and of their symbols listed in this International Standard has been increased significantly. New clauses for general quantities, for general functions, for characteristic quantities of the step response, for mapping functions and their quantities, and for parameters of transfer elements and control loops have been included;
– the hitherto existing series of reserve symbols for variable quantities of the control loop has been deleted. Four symbols out of this series have been used as new symbols for main quantities;
– the presentation of the denotation of some mathematical concepts specific to the field formerly given in 11.4 has been removed to the column “remarks” of the relevant tables.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part of IEC 60027 is applicable to control technology. It gives names and symbols for
quantities, signals and functions, and their units.