Siemens SINAMICS S120 Function Manual page 442

Function modules
7.7 Closed-loop position control
DDS p0186 p0187
(MDS) (encoder_1)
8 0 EDS0
9 4 EDS6
The referencing bit (r2684.11) is reset for a DDS changeover. If, in the new DDS, the EDS
1)
already has an adjusted encoder, then the referencing bit is set again.
440
p0188 p0189
(encoder_2) (encoder_3)
EDS1 EDS2
EDS0 EDS2
Encoder Mechanical
for conditions
position
p2504/ p2505/
control
p2506/ p2503
p2502
encoder_1 xxx
encoder_1 www
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Position Changeover
tracking response
Load gear
Deactivated Pulse
inhibit/operation:
Referencing bit is
reset. Position
1)
tracking for EDS0 is
no longer calculated
and, as a
consequence, the
actual position value
also changes (the
offset correction of
the position tracking
is canceled). When
switching back to
DDS0, the position
tracking for EDS0 is
newly initiated and
the referencing bit is
reset. It only makes
1)
sense to switch back
to DDS0 without a
new adjustment in
DDS0 if the user did
not make a new
adjustment in DDS8
and the permissible
tolerance window
(p2722) was not
exited.
Activated Pulse
inhibit/operation:
Position tracking for
EDS6 is newly
initiated and the
referencing bit is
reset. When
1)
switching back to
DDS0, the same
applies to EDS0.
Drive functions