Siemens SINUMERIK 840Di Function Manual page 280

Detailed Description
2.3 Axis/spindle service display
Fig. 2-1
Following error
The difference between the position setpoint and the actual position value of active
measuring system 1 or 2.
Unit: mm, inch or degrees
Error signal
The difference between the position setpoint at the position controller input and the actual
position value of active measuring system 1 or 2.
Unit: mm, inch or degrees
Contour deviation
The current contour deviation is displayed with this value (variations of the following error
caused by settling operations on the speed controller due to load changes).
The contour deviation results from the difference between an actual position pre-calculated
from the position setpoint and the actual position value of active measuring system 1 or 2.
Unit: mm, inch or degrees
2-6
Example for service axis/spindle HMI Advanced
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Diagnostic Tools (D1)