Siemens SINUMERIK 840DE SL - 2.6.3 Adjustment by entering a reference point value

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)
or
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.