Siemens SINUMERIK 808D ADVANCED Parameter Manual page 410

Detailed descriptions of interface signals
5.8 Axis / spindle-specific signals
Application
Special cases, errors, ... If the "parking axis" state is active, then the interface signal "Referenced/
corresponding to ...
Note for the reader
DB380x
DBX1.7
Edge evaluation: No
Signal state 1
410
1. Switching over from position measuring system 1 to position measuring
system 2 (and vice versa):
If the axis was referenced in both position measuring systems and in the
meantime, the limit frequency of the measuring encoder used was not
exceeded, i.e. IS "Referenced/synchronized 1/2" has a signal state 1,
then after the switchover, a new reference point approach is not required.
At switchover, the actual difference between position measuring system
1 and 2 is traversed immediately.
Using MD36500 ENC_CHANGE_TOL, a tolerance bandwidth can be
specified in which the deviation between the two actual values may lie at
the switchover. If the actual value difference is greater than the tolerance,
a switchover between the two systems does not take place and alarm
25100 "Measuring system switchover" not possible is triggered.
2. Parking axis (i.e. no PMS is active:
If the encoder has to be removed - e.g. if a rotary table has to be removed
from the machine - the position measuring system monitoring is switched
off in the parking position.
The mounted axis / spindle encoder turns so quickly in certain
applications that it can no longer maintain its electrical characteristics
(edge rate-of-rise, etc.).
3. Switching-off the measuring system:
When the measuring system is switched-off, the associated IS
"Referenced/synchronized 1/2" is reset.
4. Reference point approach:
The reference point approach of the axis is executed with the selected
position measuring system.
synchronized 1/2" is ignored at NC start for this axis.
DB390x DBX0.4/.5 (referenced/synchronized 1/2)
DB380x DBX2.1 (controller enable)
MD36500 ENC_CHANGE_TOL (max. tolerance for the actual position value
switchover)
MD30200 NUM_ENCS (number of encoders)
Function Manual Basic Functions G2
Override active
Signal(s) to axis / spindle (PLC → NCK)
Signal(s) updated: Cyclic
Feedrate override active (for axes):
● The axis-specific feedrate override between 0 and a maximum of 120%
entered in the PLC interface is used.
Spindle override active (for spindle):
● The spindle override - input at the PLC interface - of 50 to a maximum of
120% is taken into account.
Parameter Manual, 08/2015, 6FC5397-8EP40-0BA1
Parameter Manual