Monitoring Functions - Siemens SINUMERIK 840D sl Function Manual

H1: Manual and handwheel travel

4.14 Monitoring functions

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.
4.14 Monitoring functions
Limitations
The following limitations are active for manual and handwheel travel:
● Working-area limitation (axis must be referenced)
● Software limit switches 1 and 2 (axis must be referenced)
● Hardware limit switches
The control ensures that the traversing movement is aborted as soon as the first valid limitation
has been reached. Velocity control ensures that deceleration is initiated early enough for the
axis to stop exactly at the limit position (e.g. software limit switch). Only when the hardware
limit switch is triggered does the axis stop abruptly with "rapid stop".
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions