Control Mode - Siemens SINUMERIK 840D Function Manual

S1: Spindles
18.2 Operating modes
● Positioning mode → Axis mode
If a spindle was stopped with orientation, the assigned axis name is used to program a
change to axis mode. The gear step is retained.
● Control mode → Axis mode
Switching from control mode to axis mode can be also achieved by the programming of
M70. In this case, a rotating spindle is decelerated in the same way as for M5, position
control activated and the zero parameter set selected.
● Axis mode → Control mode
To terminate axis mode, M3, M4 or M5 can be used to change to control mode. The last
programmed spindle speed (S value) is reactivated.
● Axis mode → Oscillation mode
To terminate axis mode, M41 to M45 can be used to change to oscillation mode (only if the
programmed gear step is not the same as the actual gear step). When the gear change is
complete, the last programmed spindle speed (S value) and M5 (control mode) are
reactivated.
18.2.3

Control mode

When open-loop control mode?
The spindle is in open-loop control mode with the following functions:
● Constant spindle speed:
– S... M3/M4/M5 and G93, G94, G95, G97, G971
– S... M3/M4/M5 and G33, G34, G35
– S... M3/M4/M5 and G63
● Constant cutting speed:
– G96/G961 S... M3/M4/M5
The spindle need not be synchronized.
Requirements
A spindle position actual value encoder is absolutely essential for M3/M4/M5 in connection with:
● Revolutional feedrate (G95)
● Constant cutting speed (G96, G961, G97, G971)
● Thread cutting (G33, G34, G35)
● Tapping without compensating chuck (G331, G332)
● Activate position control (SPCON, M70)
736
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA