HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 134)

01.98
TNC 407/TNC 415/TNC 425 1 Machine axes 4-9
The NC uses markers to tell the PLC in which direction the axes are travelling.
Marker Function Set Reset
M2160
to M2164 Direction of
traverse NC NC
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:
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, the error message "Measuring system 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
aS
) of the external electronics (EXE).
MP30 Checking the absolute position of the distance-coded reference marks
Entry: %xxxxx
Bit 0 X axis 0 = not active
Bit 1 Y axis 1 = active
Bit 2 Z axis
Bit 3 4th axis
Bit 4 5th axis