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Detailed Description

2.6 Referencing with absolute value encoders

Reference Point Approach (R1)

2-32 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0

Note

Backlash compensation

If backlash compensation has been parameterized for a measuring system with absolute

encoders, attention must be paid that the machine axis is moved to the machine position

at which the adjustment is to take place in such a way that no backlash occurs.

Activate reference point offset permanently

The entered reference point offset:

MD34090 $MA_REFP_MOVE_DIST_CORR

is activated permanently following a POWER ON - Reset. If the machine axis is moved

after the absolute encoder adjustment without an interim POWER ON - Reset, the

reference point offset entered in the machine data can be overwritten, for example, as

part of internal overrun offset.

Checking the actual position

Following adjustment of the absolute encoder, we recommend that you verify the actual

position of the machine axis the next time you power up the controller (POWER ON).

2.6.3 Adjustment by entering a reference point value

Function

In the case of adjustment by entering a reference point value, the absolute position of the

machine axis relative to machine zero is determined, for example,

by measuring the position (e.g., with a laser interferometer)

by moving the machine axis to a known position (e.g., fixed stop)

and this absolute position is made known to the NC as a reference point value.

The NC then calculates the reference point offset from the difference between the encoder

absolute value and the reference point value.

Siemens SINUMERIK 804D sl Function Manual

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