Siemens SINUMERIK 828D Function Manual page 48

A2: Various NC/PLC interface signals and functions
1.2 NC/PLC interface signals
Synchronizing the actual value (homing)
Once the controller enable has been set, the actual position of the machine axis does not need to be
synchronized again (homing) if the maximum permissible limit frequency of the measuring system was not
exceeded during the time in which the machine axis was not in position-control mode.
Figure 1-5 Canceling the controller enable when the machine axis is in motion
DB31, ... DBX2.2 (spindle reset (axis/spindle-specific))
"Delete distance-to-go" is effective in AUTOMATIC and MDI modes only in conjunction with positioning axes.
The positioning axis is decelerated to standstill following the current brake characteristic. The distance-to-go of
the axis is deleted.
Spindle reset
A detailed description of the spindle reset can be found in:
References:
/FB1/ Function Manual Basic Functions; Spindles (S1)
Basic Functions
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0