HEIDENHAIN TNC 335 Technical Manual - Manual (Page 165)

4-68
TNC 360 3 Servo Positioning of the NC Axes 8/95
3.5 Monitoring functions
The NC monitors the axis positions and the dynamic behavior of the machine. If the fixed values in
the machine parameters are exceeded, an error message is displayed and the machine is stopped.
Position, standstill, movement and analog voltage are monitored.
If, for some reason, monitoring is not wanted at all, the following markers must be set in the PLC
program:
Set Reset
M2688 No monitoring X axis PLC PLC
M2689 No monitoring Y axis
M2690 No monitoring Z axis
M2691 No monitoring 4th axis
The monitoring can be reactivated by resetting the markers in the PLC.
The monitoring functions can also be switched off conditionally. In the machine parameter MP4130
a PLC input is defined, which is interrogated with a 6 ms cycle time. The condition for activating this
input is stored in MP4131. This function must be activated from the PLC by setting Bit 0 in Word
W522.
MP4130 Fast PLC input to suppress the monitoring functions
Input value: 0 to 255 (No. of the PLC input)
MP4131 Activation condition for fast PLC input from MP4130
Input value: 0 or 1
0 = Activation for Low level
1 = Activation for High level
Set Reset
W522 Bit 0 Monitoring functions suppressed PLC PLC
if PLC input MP 4130 is activated
from MP4130