6
6.3
Axis couplings (from SW 3.3)
6-446
Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
With this function, a coupling is established between the master and
slave drives depending on a position memory (queue) being processed.
Coupling always switched–in/out via the traversing program
P0410 = 5: speed–synchronous
P0410 = 6: position–synchronous
The master drive drives a conveyor belt. The position of the workpieces
is detected using a measuring probe and saved in the slave drive in
P0425:16. If a workpiece approaches its waiting position, the slave
drive must accelerate in plenty of time so that it can move in
synchronism with the workpiece in the machinery range.
Prerequisites:
If a workpiece is detected, the distance, measured to the actual slave
drive position is continuously entered into P0425:16. The first work-
piece is entered under P0425:0 and the last under P0425:15.
A maximum of 16 positions can be saved ––> otherwise, fault 168 is
output (overflow, buffer memory).
For slave drives, a traversing program cyclically runs with coupling and
machining commands.
Sequence:
1. The COUPLING IN command is executed, i.e. the slave drive waits
to be synchronized to the master drive.
2. When will synchronization start, i.e. when will the coupling be
switched–in?
Synchronization is started when the next workpiece has reached the
slave drive, i.e. if the distance between the workpiece and the slave
drive in the next interpolation clock cycle k is
v
2
LA
2a
FA
less than
v
LA
Speed, master drive
a
FA
Acceleration, slave drive
3. To start, speed synchronism is established. After this, the oldest
position is deleted from the position memory and for P0410 = 6,
position synchronism established.
The equalization motion is extremely short, as synchronization is
predictive.
After synchronism has been established, additional commands can
be executed (e.g. to machine the workpiece).
For the commands, the same conditions apply as for the program-
mable couplings.
Coupling using the
queue
functionality
(P0410 = 5 or 6)
(being prepared)
Application
example, queue
functionality
(refer to Fig. 6-36)
6 Description of the Functions
01.99
