Adjustment With Bero - Siemens SINUMERIK 840D Function Manual

10.9.5

Adjustment with BERO

Function
For adjustment using proximity switch, a reference point approach to a defined machine
position is performed the same as for incremental measuring systems. In this case, the
proximity switch 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.
Parameterization
NC: Referencing mode
The referencing mode should be set to "Referencing of incremental, rotary or linear measuring
systems: Zero pulse on the encoder track":
MD34200 $MA_ENC_REFP_MODE[<axis>] = 1
NC: Reference point value
The reference point value is parameterized via:
MD34100 $MA_REFP_SET_POS[<axis>] = <reference point value>
Drive: Equivalent zero mark
The digital input on the NCU interface to which the proximity switch is connected must be set
in parameter p0494 or p0495.
Execution
Reference point approach can be started manually in JOG-REF mode or in AUTOMATIC or
MDI mode via a part program (G74).
After successful completion of the reference point approach, the absolute encoder is adjusted
and the actual-value system of the machine axis is synchronized.
As feedback for the PLC user program, the NC sets the NC/PLC interface signal for the
machine axis, depending on the active measuring system:
DB31, ... DBB60.4/60.5 (referenced/synchronized 1/2) = 1
Note
If the proximity switch is removed after adjustment of the absolute encoder, the referencing
mode must be re-parameterized to "Referencing with absolute encoder".
MD34200 $MA_ENC_REFP_MODE[<axis>] = 0
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
10.9 Referencing with absolute encoders
R1: Referencing
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