Siemens SINUMERIK 840D sl Function Manual page 844

Glossary
Leadscrew error compensation
Compensation for the mechanical inaccuracies of a leadscrew participating in the feed. The
controller uses stored deviation values for the compensation.
Limit speed
Maximum/minimum (spindle) speed: The maximum speed of a spindle can be limited by
specifying machine data, the → PLC or → setting data.
Linear axis
In contrast to a rotary axis, a linear axis describes a straight line.
Linear interpolation
The tool travels along a straight line to the destination point while machining the workpiece.
Load memory
The load memory is the same as the → working memory for the CPU 314 of the → PLC.
Look Ahead
The Look Ahead function is used to achieve an optimal machining speed by looking ahead
over an assignable number of traversing blocks.
Machine axes
Physically existent axes on the machine tool.
Machine control panel
An operator panel on a machine tool with operating elements such as keys, rotary switches,
etc., and simple indicators such as LEDs. It is used to directly influence the machine tool via
the PLC.
Machine coordinate system
A coordinate system, which is related to the axes of the machine tool.
Machine zero
Fixed point of the machine tool to which all (derived) measuring systems can be traced back.
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Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions