Lenze E94AxHE Technology Application Synchronism - Manual (Page 13)

EDS94TA10040xxxx EN 1.1 - 10/2008
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9400 Technology applications | Synchronism with mark synchronisation
Introduction
Transmission of the master angle
3.3 Transmission of the master angle
The master value/angle can be transmitted via the following transmission media:
r Digital frequency (simulation of an incremental encoder)
r System bus (CAN)
r ETHERNET Powerlink
The transmission medium is selected according to the criteria listed in the below table:
3.4 Speed or angular synchronism?
The decision whether to use a speed or angular synchronism mainly refers to the TA
"Electronic gearbox".
Angular synchronism
Use the angular synchronism if the material is not able to absorb any force and no
remaining positional variation must be available. Please note that a position controller
always causes additional trouble in a track since disturbances and reference value
variations must be compensated exactly.
Speed synchronism
Use the speed synchronism if the material is able to absorb force which ensures a better
concentricity.
3.5 Rail or cascade structure?
Rail structure
All drives obtain the same master value/master angle.
Transmission medium
Criterion Digital frequency System bus (CAN) ETHERNET Powerlink
Network structure Rail or cascade Rail Rail or cascade
Master value/master angle
transmission
Only relative Absolute or relative Absolute or relative
Max. resolution 16 bits/revolution 24 bits/revolution 24 bits/revolution
Cable length Virtually unlimited, but
max. 50 m from drive to
drive.
Depends on baud rate,
number of nodes and
cable cross-section.
With a baud rate of
500 kbits/s the total
cable length is limited to
e.g. 117 metres.
Virtually unlimited, but
max. 100 m from drive to
drive.
Additional hardware required Digital frequency
extension module
(E94AYFLF)
No, interface is already
integrated in
9400 HighLine (CAN on
board).
ETHERNET Powerlink
communication module
(E94AYCEP)
* In preparation; at present 16 bits/revolution