Monitoring Functions - HEIDENHAIN TNC 415 Technical Manual

3.5 Monitoring functions

The NC monitors the axis positions and the dynamic behaviour of the machine. If the fixed values in
the machine parameters are exceeded, an error message is displayed and the machine is stopped.
If monitoring is not wanted, it can be deactivated for the following using M2688 to M2692:
•
Position monitoring
•
Standstill monitoring
•
Movement monitoring
•
Monitoring of the analog voltage
Marker Function
M2688 No monitoring X axis
M2689 No monitoring Y axis
M2690 No monitoring Z axis
M2691 No monitoring 4th axis
M2692 No monitoring 5th 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 the same cycle time as the control loop (TNC 415:
3 ms; TNC 407: 6 ms). 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.
If monitoring functions are switched off, safe operation of the machine cannot be
guaranteed. Uncontrolled movements of the axes are not recognized.
MP4130 Fast PLC input to suppress the monitoring functions
Entry: 0 to 255 (No. of the PLC input)
MP4131 Activation condition for fast PLC input from MP4130
Entry: 0 or 1
0 = activation for Low level
1 = activation for High level
Address Function
W522 Bit 0 Monitoring functions suppressed
if PLC input from MP 4130 is activated
01.98 TNC 407/TNC 415/TNC 425
Set Reset
PLC PLC
Set
PLC
3 Servo positioning of the NC-axes
Reset
PLC
4-83