Siemens SINUMERIK 840C - Manual (Page 249)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.4 Axis-specific MD 1 (axial data 1)
Time constant symmetrizing filter 392*
Default value Lower input limit Upper input limit Units
0 +0 1 000 0.1 ms
Active
–
In order to avoid axis overshooting when working with feedforward control, the set part position
is fed to the position controller with a time delay. This delay is set with this machine data.
Input value:
= 0 Static feedforward control (e.g. for AC drives with a rise time < position control
sampling interval)
0 Dynamic feedforward control (for axes with a rise time > position control sampling
interval)
Note:
Normal: 1 /
2
rise time of drive
As from SW 4, for 8 parameter sets
Absolute offset 396*
Default value Lower input limit Upper input limit Units
0 - 99 999 999 99 999 999 units (IS)
Active on
Power On
Active after POWER ON
The offset is calculated automatically on reference point approach (SIPOS, ENDAT) or can be
entered manually without a reference point approach (SIPOS, ENDAT, distance coding).
NC machine data bits 1808* bits 0 to 4 must be taken into consideration. On reference point
approach with distance coded reference marks, the offset between the machine zero and the
linear scale is entered as the offset. (See Section entitled ”Axis (Analog) and Spindle
Installation” for calculation)
Note:
Observe MD 1808, bit 1 ”Value range extension of absolute offset” as from SW 5.
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SINUMERIK 840C (IA)