HEIDENHAIN TNC 335 Technical Manual - Manual (Page 105)

4-8
TNC 360 1 Machine Axes 8/95
1.1.3 Encoder 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:
Error message
The absolute position of distance-coded reference marks C
The amplitude of the measuring system signals A
The edge separation of the measuring system signals B
If one of the conditions is not fulfilled, it results in the error message:
"Measuring system <axis> defect A/B/C."
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
aS
) of the external electronics (EXE or
IBV).
MP30 Checking the absolute position of the distance-coded reference marks
Input range: 0 to 15
Bit 0 X axis +0 = not active
+1 = active
Bit 1 Y axis +0 = not active
+2 = active
Bit 2 Z axis +0 = not active
+4 = active
Bit 3 4th axis +0 = not active
+8 = active
MP31 Checking the amplitude of the measuring system signals
Input range: 0 to 31
Bit 0 X axis +0 = not active
+1 = active
Bit 1 Y axis +0 = not active
+2 = active
Bit 2 Z axis +0 = not active
+4 = active
Bit 3 4th axis +0 = not active
+8 = active
Bit 4 Axis S +0 = not active
+16 = active