6
6.3 Axis couplings (from SW 3.3)
6-462
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
The master/slave functionality is realized using analog signals
or PROFIBUS–DP.
Note
Master/slave operation is only possible for motors with encoders!
An example of a coupling between two drives with analog input/out-
puts is described in Chapter 6.6.5.
The following example shows a coupling with PROFIBUS–DP.
Speed
setpoint
1 signal
M
set
operation
0 signal
n
set
operation
(STW1.14)
Master drive
Torque actual
value: Msoll
M
3 ∼
M
3 ∼
for a rigid coupling
––> M
set
operation
for a released coupling
––> n
set
operation
Dependent on
the mechanical
coupling
Rigid or quasi–rigid
connection, which can
also be released in
operation.
PROFIBUS–DP
PROFIBUS–DP
Slave drive
Torque
setpoint:
MsollExt
PROFIBUS–DP
PROFIBUS–DP
Fig. 6-41 Example: Coupling two drives with master/slave to PROFIBUS–DP
!
Warning
If, for a master/slave configuration, the rigid mechanical coupling is
released (the coupling is opened) then at the same time the slave drive
must be changed over to n
set
operation as otherwise the slave drive
would accelerate in an uncontrolled fashion to the maximum speed.
Application
example
master/slave
6 Description of the Functions
08.01
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