Siemens SINUMERIK 840D sl Operating Manual page 36

Introduction
2.3 Machine control panels
Traversing axes with rapid traverse override and coordinate switchover
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Spindle control with override switch
Feed control with override switch
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Axis keys
Selects an axis.
Direction keys
Select the traversing direction.
<RAPID>
Traverse axis in rapid traverse while pressing the direction key.
<WCS MCS>
Switches between the workpiece coordinate system (WCS) and machine
coordinate system (MCS).
<SPINDLE STOP>
Stop spindle.
<SPINDLE START>
Spindle is enabled.
<FEED STOP>
Stops execution of the running program and shuts down axis drives.
<FEED START>
Enable for program execution in the current block and enable for ramp-up
to the feedrate value specified by the program.
Operating Manual, 05/2017, A5E40868956
Milling