HEIDENHAIN TNC 426 PB/M Technical Manual page 512

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Module 9042 Reading the spindle coordinates (format 0.001°)
The following coordinate values are saved in five successive double words
beginning with the specified target address:
n
Actual value
n
Nominal value
n
Actual value in reference system
n
Following error (servo lag)
n
Distance to go
The values for actual, nominal, and reference value are standardized at 0° to
+360.000°.
The values for servo lag and distance-to-go are displayed between –2879.912°
and +2879.912°. Format: 0.001°.
If MP3010 < 6 (no closed-loop spindle), then all coordinates are read as zero.
During operation under open-loop control (M03 / M04 active or M05 and open
position control loop), the nominal value is considered to be the actual value.
The following error and distance to go are considered to be zero.
Call:
PS B/W/D/K <Target address Cxxxx>
CM 9042
Error recognition:
Marker Value Meaning
M4203 0 Actual speed value was read
1 Target address is too large or is not a double-word
address
Module 9044 Reading the spindle coordinates (format 0.0001°)
Call:
SEE MODULE 9042.
HEIDENHAIN Technical Manual TNC 426, TNC 430