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5 monitoring functions – HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual

Page 208

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01.98

TNC 407/TNC 415/TNC 425

3 Servo positioning of the NC-axes

4-83

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

Set

Reset

M2688

No monitoring X axis

PLC

PLC

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

Set

Reset

W522 Bit 0

Monitoring functions suppressed

PLC

PLC

if PLC input from MP 4130 is activated