Spindles (S1) 
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0 
1-1 
Brief Description 
1
1.1  1.1 Brief Description 
Spindle functions 
The primary function of a spindle is to set a tool or workpiece in rotary motion in order to 
facilitate machining. 
Depending on the type of machine, the spindle must support the following functions in order 
to achieve this: 
•  Input of a direction of rotation for the spindle (M3, M4) 
•  Input of a spindle speed (S....) 
•  Spindle stop without orientation (M5) 
•  Spindle stop with orientation/spindle positioning  
(SPOS, M19, and SPOSA) 
•  Gear change (M40 to M45) 
•  Spindleaxis functionality (spindle becomes rotary axis and vice versa) 
•  Thread cutting (G33, G34, G35) 
•  Tapping with and without compensating chuck (G331, G332) 
•  Revolutional feedrate (G95) 
•  Constant cutting rate (G96, G961, G97, G971) 
•  Programmable spindle speed limits (G25, G26, LIMS) 
•  Position encoder assembly on the spindle or on the spindle motor 
•  Spindle monitoring for min. and max. speed as well as 
max. encoder limit frequency and end point monitoring of spindle 
•
  Switching the position control (SPCON, SPCOF, M70) on/off 
•  Programming of spindle functions: 
– From the part program 
– Via synchronized actions 
– Via PLC with FC18 or via special spindle interfaces for simple spindle activation