Calibration With Bero - Siemens SINUMERIK 828D Function Manual

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Calibration with BERO

For adjustment using BERO, a reference point approach to a defined machine position is performed the same as

for incremental measuring systems. In this case the BERO replaces the encoder zero mark that the absolute

encoder does not have. After successful completion of reference point approach, the NC automatically calculates

the reference point offset from the difference between the encoder absolute value and the parameterized

reference point value.

Proceed as follows for adjustment with BERO:

1. Set referencing mode to "Referencing with BERO":

MD34200 $MA_ENC_REFP_MODE = 2

2. Assign reference point value:

MD34100 $MA_REFP_SET_POS =

3. Start reference point approach.

Reference point approach can be started manually in JOG-REF mode or in AUTOMATIC or MDA mode from

a part program (G74).

After a successful reference point approach, the absolute encoder is calibrated, the actual value system of the

machine axis is synchronized, and the machine axis is referenced.

To identify this, the NC sets an interface signal for the measuring system that is currently active:

DB31, ... DBB60.4 / 60.5 (referenced/synchronized 1 / 2) = 1

If the BERO is removed after adjustment of the absolute encoder, the referencing mode

must be assigned to "Referencing with absolute encoder".

MD34200 $MA_ENC_REFP_MODE = 0

Signal propagation delay compensation

The signal propagation time can cause corruption of the absolute position detected by the NC. The signal

propagation time can be compensated for in any direction:

MD31122 $MA_BERO_DELAY_TIME_PLUS (BERO delay time plus)

MD31123 $MA_BERO_DELAY_TIME_MINUS (BERO delay time minus)

Prerequisite for a correct compensation of signal propagation time is drives of type

SIMODRIVE 611 digital. The compensation times are pre-set in delivery condition in such a

way that changes are usually not required.

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Reference point value

R1: Reference point approach

15.9 Referencing with absolute value encoders

Sinumerik 840d sl