Siemens SINUMERIK 828D Function Manual page 1635

DB31, ...
DBX21.3 - DBX21.4 Motor selection A, B
Edge evaluation: No
Meaning The PLC can switch between 4 different motors or motor mode types using the motor selection
function.
The following assignment applies:
As soon as a new motor selection is detected, the drive cancels the pulse enable (feedback signal
using the interface signal DB31, ... DBX93.3 and 4 (active motor)).
Using the motor selection, it is possible, for example, to choose mode 1 as star-connected operation
and mode 2 as delta-connection operation for the main spindle drive (MSD).
The drive signals the currently selected motor back to the PLC using the interface signals:
DB31, ... DBX93.3 and 4 (active motor).
Application Timing for star­delta switchover
example(s)
Special cases, Caution:
errors, .... Before a new motor is selected, the interface signal:
DB31, ... DBX21.5 (motor being selected)
must be set to 0!
Corresponding to ... DB31, ... DBX93.3 and 4 (active motor)
DB31, ... DBX21.5 (motor being selected)
Additional /IDsl/ Commissioning Manual IBN CNC: NCK, PLC, Drive
references
DB31, ...
DBX21.5 Motor being selected
Edge evaluation: no
Signal state 1 or The PLC outputs the interface signal:
edge change DB31, ... DBX21.5 (motor being selected)
0 → 1 to the drive to confirm that the external contactor has been switched over to the new motor (e.g. that
motor contactor 2 has been energized as part of the star/delta switchover process).
The pulses are then enabled by the drive.
Signal state 0 or The interface signal:
edge change DB31, ... DBX21.5 (motor being selected)
1 → 0 must be reset to 0 by the PLC user program before a new motor is selected! Otherwise the pulses
from the drive might be enabled too early.
Corresponding to ... DB31, ... DBX93.3 and 4 (active motor)
DB31, ... DBX21.3 and 4 (motor selection A, B)
Additional /IDsl/ Commissioning Manual IBN CNC: NCK, PLC, Drive
references
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
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