Monitoring Functions - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

6.11 Monitoring Functions

The NC monitors the axis position and the dynamic response of the machine.

If the fixed values are exceeded, it displays an error message and stops the

With W1042 you can switch off the following types of monitoring for individual

Position monitoring

Standstill monitoring

Movement monitoring

Nominal speed value monitoring

Deactivation of monitoring functions

Bits 0 to 8 correspond to axes 1 to 9

0: Monitoring functions active

1: Monitoring functions inactive

Safe machine operation is not possible if the monitoring functions are

switched off. Uncontrolled axis movements are not detected.

If the reaction time of the PLC (21 ms) for switching off the monitoring

functions is not sufficient, you must use a high-speed PLC input. Fast PLC

inputs are interrogated in the control loop cycle (3 ms).

In MP4130.0, enter the number of the PLC input that must be sampled

The inputs of the PL 4xxB cannot be used as high-speed PLC inputs.

Define in MP4131.0 the activation criterion for the input specified in

Enable MP4130.0 with W522 bit 0. As soon as the input is set, the

monitoring functions and the drives are switched off. The axes are

automatically stopped. If the following error is greater than MP1030.x

(positioning window), the actual value is saved as nominal value. The

monitoring functions become active again if the high-speed PLC input is

reset or MP4130.0 has been disabled with W522 bit 0.

HEIDENHAIN Technical Manual TNC 426, TNC 430