Siemens SINUMERIK 840D sl Function Manual page 522

TE3: Speed/torque coupling, master-slave
12.7 Response on activation/deactivation
Phase 2
The following synchronous signals are generated from the actual speed difference between
the master and slave spindle(s):
DB31, ... DBX96.3 (speed tolerance, coarse)
DB31, ... DBX96.2 (speed tolerance, fine)
The associated limits are set using the following machine data:
MD37270 $MA_MS_VELO_TOL_COARSE ("Tolerance coarse")
MD37272 $MA_MS_VELO_TOL_FINE ("Tolerance fine").
Note
The "Speed tolerance coarse" signal can be used to implement a monitoring function on the
PLC side that checks a coupled master-slave group for loss of speed synchronism.
The "Speed tolerance fine" signal can be used to directly derive the time taken to close the
coupling mechanically and activate the torque equalization controller.
Figure 12-7
522
Coupling operation at different speeds
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions