Siemens SINUMERIK 840D sl Programming Manual page 576

Glossary
KV
Servo gain factor, a control variable in a control loop.
Leading axis
The leading axis is the → gantry axis that exists from the point of view of the operator and
programmer and, thus, can be influenced like a standard NC axis.
Leadscrew error compensation
Compensation for the mechanical inaccuracies of a leadscrew participating in the feed. The
control 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 → RAM 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.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals