Siemens SINUMERIK 840D Function Manual page 722

H1: Manual traversing
17.13 Use of handwheels in automatic mode
This means that an overlaid movement can only be executed when no DRF offset (triggered by
the same handwheel) is active for the axes in the basic coordinate system that are involved in
the movement, i.e., the DRF movement must have been terminated.
If an overlaid movement has been started, no DRF offset can be started for any of the axes
involved that are supplied by the same handwheel. Such a DRF movement is only possible
when the movement with overlay has reached its end point or has been aborted by delete
distance-to-go or RESET.
If the handwheel override and DRF offset are to be active simultaneously, this is possible with
activation of two separate handwheels.
Example: Path override
Assumption:
Channel 1 and geometry axis X correspond to machine axis 3 and geometry axis Y
corresponds to machine axis 5 and handwheel 2 is selected for the first geometry axis.
If block X10 Y10 FD=0 is processed in the main run, neither machine axis 3 nor machine axis 5
can be traversed with DRF via handwheel 2. If handwheel 2 is assigned to machine axis 3 while
the channel-specific DRF signal is active, then alarm 14320 (Handwheel 2 used twice (8) in
channel 1 axis X) is signaled.
If machine axis 3 or machine axis 5 is traversed with DRF using the 2nd handwheel, then
motion X10 Y10 FD=0 cannot be executed and alarm 14320 (handwheel 2 used twice (3) in
channel 1 axis X) or alarm 14320 (handwheel 2 used twice (3) in channel 1 axis Y) is signaled.
Example: Velocity override of positioning axis
Assumption:
Channel 1: Channel axis A corresponds to machine axis 4 and handwheel 1 is assigned to this
axis.
If block POS[A]=100 FDA[A]=0 is processed in the main run, machine axis 4 cannot be
traversed with DRF. This means that if the channel-specific DRF signal is active, alarm 14320
(Handwheel 1 used twice (6) in channel 1 axis A) is signaled.
If machine axis 4 is traversed with DRF, then no POS[A]=100 FDA[A]=0 movement can be
executed while a DRF movement is being performed. Alarm 14320 (Handwheel 1 used twice
(1) in channel 1 axis A) is signaled.
Example: Distance overlay PLC axis (840D sl)
Assumption:
Channel 1: Handwheel 2 is assigned to machine axis 4.
If an axis movement with path override of the 4th machine axis triggered by FC18 is processed
in the main run, machine axis 4 cannot be traversed with DRF. This means that if the channel-
specific DRF signal is active, alarm 14320 (Handwheel 2 used twice (9) in channel 1 axis A) is
signaled.
If machine axis 4 is traversed with DRF, then no axis movement with path override triggered by
FC18 can be executed while a DRF movement is being performed. Alarm 14320 (Handwheel 2
used twice (4) in channel 1 axis A) is signaled.
722
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA