Siemens SIMODRIVE 611 universal Function Manual page 448

6 Description of the Functions
6.3 Axis couplings (from SW 3.3)
Axis coupling for
modulo
rotary axes
(from SW 4.1)
Modulo correction
Telegram loss
Limitations/
secondary
conditions
6-448
In order to implement an axis coupling for modulo rotary axes, the follo-
wing settings must be made:
S
Which settings have to be made for the master axis?
– "Positioning" mode (P0700 = 3)
– Set the modulo rotary axis (P0241, P0242)
S
Which settings have to be made for the slave axis?
– "Positioning" mode (P0700 = 3)
– Set the modulo rotary axis (P0241, P0242)
– For the slave axis, the modulo range of the master axis must be
specified in P0898.
P0242 (master axis) + P0898 (slave axis)
i.e.:
Note
The modulo range of the master axis can be the same or not equal to
the modulo range of the slave axis.
P0242 (master axis) + or 0 P0242 (slave axis)
i.e.:
Position reference value steps as a result of modulo correction are de-
tected by the slave drive itself, i.e. it is not permissible that control bit
QStw.0 or the correction value dXcorExt are set.
The following is required:
S
P0898 must be correctly parameterized for the slave drive.
S
The traversing difference between two position reference values is
the maximum of half the modulo range (so that the direction of mo-
tion is clear)
Telegrams may be lost when transferring data via Profibus–DP. In this
case, the slave drive must extrapolate a new reference value position
from the previous acceleration and velocity.
The correct position is only approached with the next valid telegram. If
more telegrams are lost than are parameterized in P0879, Fault 595 or
597 is output and the drive comes to a standstill.
The following secondary conditions must be observed for position refe-
rence value and actual value coupling:
S
Resolution of the angular incremental encoder interface
It should be carefully observed that the coupling must be configured
with a high resolution (encoder), e.g. for
––> a good resolution: 2048 pulses correspond to 10 mm
––> a poor resolution: 1250 pulses correspond to 1500 mm
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
E Siemens AG 2005 All Rights Reserved
10.04 01.99