Siemens SINUMERIK 840D Function Manual page 666

H1: Manual traversing
17.6 Manual traversing using a handwheel
Figure 17-3
If a stop condition is activated during the handwheel travel, the motion is aborted and the
"Travel request" and "Travel command" NC/PLC interface signals are reset.
Example 3: Manual traversing using a handwheel with velocity setpoint, stop condition is a cancellation
criterion
If the handwheel is no longer moved for velocity specification
(MD11346 $MN_HANDWH_TRUE_DISTANCE == 0 or == 2), the "Travel request" NC/PLC
interface signal is reset.
The "Travel request" PLC signal is also reset when the handwheel is deselected.
666
Signal-time diagram:Manual traversing using a handwheel, stop condition is a
cancellation criterion
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA