Technical data

Drive functions
7.3 Function modules
Function Manual
250 Function Manual, 06/2012, 6SL3097-4AB10-0BP4
Preconditions
● The position of the zero mark that has the shortest distance to the position when the
BERO signal switches is to be determined.
● The appropriate mechanical preconditions must be fulfilled when mounting the BERO.
● Preferred mechanical configuration
The BERO signal covers the zero mark, as in this case, the zero mark selection is
independent of the direction of rotation.
● In order to be able to precisely determine the position of the BERO (in relation to the
reference position of the encoder) even at higher speeds, this must be connected to a
fast Control Unit input.
Evaluating the BERO signal
You have the option of either evaluating the positive or negative signal edge of the BERO
signal:
● Positive edge (factory setting)
For referencing with a positive evaluation of the BERO signal, the encoder interface
supplies the position of that reference mark, which is directly detected after the positive
edge of the BERO signal. If, mechanically, the BERO is sized in such a way that the
BERO signal covers the entire width of the encoder zero mark, the required encoder zero
mark will be reliably detected in both traversing directions.
● Negative edge
For referencing with a negative edge evaluation of the BERO signal, synchronization is
realized to the next reference mark after leaving the BERO signal.
Proceed as follows to parameterize referencing with several zero marks:
● Using parameter p0493, define the fast digital input to which the BERO is connected.
● Set the corresponding bit of parameter p0490 to 1: The signal inversion means that the
evaluation uses the negative edge of the BERO signal.