Siemens SINUMERIK 840D sl Function Manual page 321

Velocity override
The spindle-override-switch JOG velocity is active for spindles.
JOG acceleration
As a spindle often uses many gear stages in speed-control and position-control modes, the
acceleration associated with the current gear stage is always applied to the spindle in JOG
mode.
References:
/FB1/ Function Manual, Basic Machine; Spindles (S1)
PLC interface signals
In the case of spindle manual travel, the PLC interface signals between the NCK and PLC
have the same effect as for machine axes.
Interface signals
DB31, ... DBX60.7 or DBX60.6 (position reached with fine or coarse exact stop)
are only set if the spindle is in position control.
In the case of interface signals that are only spindle-specific, while the spindles are
traversing in JOG the following should be noted:
● The following PLC interface signals to the spindle have no effect:
● The following PLC interface signals from the spindle are not set:
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
– DB31, ... DBX17.6 (invert M3/M4)
– DB31, ... DBX18.7 or DBX18.6 (counterclockwise setpoint direction or clockwise
setpoint direction)
– DB31, ... DBX18.5 (oscillation speed)
– DB31, ... DBX16.7 (spindle RESET)
– DB31, ... DBX83.7 (clockwise actual direction)
– DB31, ... DBX83.5 (spindle in set range)
Manual and Handwheel Travel (H1)
4.10 Special features of manual travel
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