Measuring System Monitoring - HEIDENHAIN TNC 415 Technical Manual

The NC uses markers to tell the PLC in which direction the axes are travelling.
Marker Function
M2160 Direction of
to M2164 traverse
0 = positive
1 = negative
M2160 X axis
M2161 Y axis
M2162 Z axis
M2163 4th axis
M2164 5th axis

1.1.3 Measuring system monitoring

HEIDENHAIN contouring controls can monitor the signal transmissions of the measuring system.
This measuring system monitoring must be activated by a machine parameter.
Three different conditions can be checked:
The absolute position of distance-coded reference marks
The amplitude of the measuring system signals
The edge separation of the measuring system signals
If one of the conditions is not fulfilled, the error message "Measuring system <axis> defective
A/B/C" will appear.
For sinusoidal signals the LE monitors the amplitude of the measuring system signals, for square-
wave signals the LE evaluates the fault detection signal (U
MP30 Checking the absolute position of the distance-coded reference marks
Entry: %xxxxx
Bit 0 X axis
Bit 1 Y axis
Bit 2 Z axis
Bit 3 4th axis
Bit 4 5th axis
01.98 TNC 407/TNC 415/TNC 425
Set Reset
NC NC
0 = not active
1 = active
1 Machine axes
Error message
C
A
B
) of the external electronics (EXE).
aS
4-9