Efficient Networks Siemens Sinamics S120 - Manual (Page 266)

Function modules
7.9 Basic positioner
Drive Functions
266
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Instructions for switching data sets
Using drive data set switching (DDS), motor data sets (p0186) and encoder data sets (p0187
to p0189) can be switched. The following table shows when the reference bit (r2684.11) or
the status of the adjustment with absolute encoders (p2507) is reset.
In the following cases, when a DDS switch takes place, the current actual position value
becomes invalid (p2521 = 0) and the reference point (r2684.11 = 0) is reset.
● The EDS that is effective for the position control changes.
● The encoder assignment changes (p2502).
● The mechanical relationships change (p2503...p2506)
With absolute encoders, the status of the adjustment (p2507) is also reset, if the same
absolute encoder is selected for the position control although the mechanical relationships
have changed (p2503 ... p2506).
In operating mode, an error message (F07494) is also generated.
The following table contains a few examples for data set switching. The initial data set is
always DDS0.
Table 7-5 DDS switch without load gearbox position tracking
DDS p186
(MDS)
p187
(encoder_1) p188
(encoder_2) p189
(encoder_3) Encoder
for
position
control
p2502
Mecha-
nical
conditions
p2504/
p2505/
p2506 or
p2503
Load
gearbox
position
tracking
Changeover response
0 0 EDS0 EDS1 EDS2 encoder_1 xxx disabled ---
1 0 EDS0 EDS1 EDS2 encoder_1 xxx disabled Switching during pulse
inhibition or operation has
no effect
2 0 EDS0 EDS1 EDS2 encoder_1 yyy disabled Pulse disabling: Position
actual value preprocessing
is newly initiated 1) and
reference bit 2) is reset.
Operation:
Error message is
generated. Position actual
value preprocessing is
newly initiated 1) and
reference bit 2) is reset.
3 0 EDS0 EDS1 EDS2 encoder_2 xxx disabled
4 0 EDS0 EDS3 EDS2 encoder_2 xxx disabled
5 1 EDS4 EDS1 EDS2 encoder_1 xxx disabled
Pulse disabling: Position
actual value preprocessing
is newly initiated 1) and