Evaluating Bero Signals - Siemens SINAMICS S120 Function Manual

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Evaluating BERO signals

● 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.

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 edge 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.

Setting referencing

Proceed as follows to parameterize referencing with several zero marks:

1. Using parameter p0493, define the fast digital input to which the BERO is connected.

2. Set the corresponding bit of parameter p0490 to 1.

The signal inversion means that the evaluation uses the negative edge of the BERO signal.

Referencing procedure

The referencing process is performed as follows:

1. Via the PROFIdrive encoder interface, the Control Unit receives the request for a reference

mark search.

2. Using the parameterization, the Control Unit determines the zero mark depending on the

BERO signal.

3. The Control Unit provides the (possibly corrected) zero mark position as reference mark via

the PROFIdrive encoder interface.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Function modules

9.8 Basic positioner