Siemens SINUMERIK 840Di Function Manual page 281

Servo gain factor (calculated)
The servo gain factor in the display is calculated by the NC according to the following
equation:
Velocity setpoint = setpoint currently being output to the axis/spindle.
References: /FB1/, G2, "Velocities, Setpoint/Actual Value Systems, Control Loop Control"
Active meas. system
This line indicates whether measuring system 1 or 2 is active.
Position actual value measuring system 1/2
The actual position of the axis as measured via measuring system 1/2. The position is
displayed in the machine coordinate system (no work offsets or tool offsets included).
Unit: mm, inches or degrees
Position reference value
Specified position transferred from the interpolator to the position control.
Unit: mm, inches or degrees
Compensation value meas. system 1 or 2
Display of absolute compensation value for measuring system 1 or 2.
The compensation value consists of the sum of backlash and leadscrew error compensation
for the actual axis position.
Unit: mm, inches or degrees
Sag and temperature compensation
Display of the compensation value calculated for the current axis position based on the total
of the sag and temperature compensations.
Unit: mm, inches or degrees
Diagnostic Tools (D1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Detailed Description
2.3 Axis/spindle service display
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