Siemens SINUMERIK 840D sl Function Manual page 398

K3: Compensation
5.4 Interpolatory compensation
Position display
The position actual-value display in the machine coordinate system shows the ideal
(programmed) actual position value of the axis (ideal machine).
The position actual value determined by the measuring system plus the sum of MSEC and
backlash compensation (= position actual value, measuring system 1/2) is displayed the
"axis/spindle" service display (operating area "Diagnosis")
Compensation value display
The following compensation values are also output in the "Axis/spindle" service display
(operating area "Diagnosis"):
● Absolute compensation value measuring system 1 or 2
● Compensation, sag + temperature
Reference:
Function Manual, Basic Functions; Diagnostic Tools (D1)
Reference point loss
If the reference point of the basic axis is lost (DB31, ... DBX60.4 or 60.5 = 0), then MSEC
and sag compensation functions are deactivated in the axes involved. These are
automatically reactivated when the reference point is reached.
Access protection
Currently there is no protection against access to the compensation tables.
Setting servo enables
As a result of the compensation relationship, a traversing movement by the base axis may
also cause the compensation axis to move, making it necessary for controller enable signals
to be set for these axes (PLC user program). Otherwise the compensation only has a limited
effect.
Traversing signal output
The traversing signals in the compensation axis are output every time the compensation
function is switched on/off and every time the number of active compensation tables
changes.
Any change in the compensation value caused by the base axis motion does not result in
output of traversing signals in the compensation axis.
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Displayed value corresponds to the total compensation value calculated from MSEC and
backlash compensation associated with the actual position of the axis (measuring system
1 or 2).
Display value is the sum of the compensation values from sag compensation and
temperature compensation for the actual position of the axis.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions