Glossary - Siemens SINUMERIK 840D sl Programming Manual

Glossary

Absolute dimensions
A destination for an axis movement is defined by a dimension that refers to the origin of the
currently active coordinate system. See -> incremental dimension.
Acceleration with jerk limitation
In order to optimize the acceleration response of the machine whilst simultaneously
protecting the mechanical components, it is possible to switch over in the machining program
between abrupt acceleration and continuous (jerk-free) acceleration.
Address
An address is the identifier for a certain operand or operand range, e.g. input, output etc.
Analog input/output module
Analog input/output modules are signal formers for analog process signals.
Analog input modules convert analog measured values into digital values which can be
processed in the CPU.
Analog output modules convert digital values into analog output signals.
Approach machine fixed-point
Approach motion towards one of the predefined -> fixed machine points.
Archiving
Reading out data and/or directories to an external memory device.
A-Spline
The Akima-Spline runs under a continuous tangent through the programmed interpolation
points (3rd order polynomial).
Asynchronous subroutine
A parts program which can be started asynchronously to (independently of) the current
program status by an interrupt signal (e.g. "rapid NC input" signal).
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
Glossary-1