Referencing With Absolute Encoders; Information About The Adjustment - Siemens SINUMERIK 840D Function Manual

10.9

Referencing with absolute encoders

10.9.1

Information about the adjustment

Machine axes with absolute encoder
The advantage of machine axes with absolute encoder is that after a one time adjustment
procedure, the necessary reference point traversing with incremental measuring systems (e.g.
build-up of control, de-selection of "Parking" of machine axes etc.) can be skipped and the
actual value system of the machine axis can be immediately synchronized to the determined
absolute position.
Adjustment
Adjustment of an absolute encoder involves matching the actual value of the encoder with the
machine zero once and then setting it to valid.
The current adjustment status of an absolute encoder is displayed in the following axis-specific
machine data of the machine axis, to which it is connected:
MD34210 $MA_ENC_REFP_STATE (status of absolute encoder)
Value
0
1
2
Adjustment methods
The following adjustment methods are supported:
● Adjustment by entering a reference point offset
● Adjustment by entering a reference point value
● Automatic adjustment with probe
● Adjustment by means of the proximity switch
Readjustment
Readjustment of the absolute encoder is required after:
● Gear change between load and absolute encoder
● Removal/installation of the absolute encoder
● Removal/installation of the motor with the absolute encoder
● Data loss in the static NC memory
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
Encoder not calibrated
Encoder adjustment enabled
Encoder is calibrated
10.9 Referencing with absolute encoders
R1: Referencing
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