HEIDENHAIN TNC 306 Technical Manual - Manual (Page 146)

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TNC 406/TNC 306 3 Servo positioning of the NC-axes 3/97
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 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 axis 4
M2692 * No monitoring axis 5
Monitoring can be reactivated by resetting the markers in the PLC.
3.5.1 Position monitoring for operation with lag
The machine parameters MP1710 and MP1720 determine the ranges for the continuous position
monitoring in the machine (lag monitoring). The monitoring is active as soon as the axes are under
the control of the position control loop.
If the limits of parameter MP1710 are exceeded, the error message
"Position error"
will appear and the machine stops. The error message can be canceled by the "CE" key.
If the limit of parameter MP1720 is exceeded, the flashing error message
"Gross positioning error A"
appears.
This error can only be canceled by switching off the control. An entry value of approx. 1 to 1.4 times
lag for rapid traverse is realistic. MP1720 is larger than MP1710.
MP1710 Position monitoring for operation with lag (cancelable)
Entry value: 0.0001 to 100 [mm]
MP1720 Position monitoring for operation with lag (EMERGENCY STOP)
Entry value: 0.0001 to 100 [mm]
* only TNC 406