Standstill Monitoring; Positioning Window; Axes In Position - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

6.11.4 Standstill Monitoring

Standstill monitoring is effective during operation both with velocity

feedforward and with following error, as soon as the axes have reached the

positioning window.

If the position difference is greater than the value defined in MP2800.x, the

blinking error message STANDSTILL MONITORING IN <AXIS> appears. The

message also appears if, while moving to a position, an overshoot occurs that

is larger than the input value in MP1110.x, or if the axis moves in the opposite

direction when beginning a positioning movement:

In MP1110.x, enter a threshold from which the standstill monitoring should

go into effect.

MP1110.0-8 Standstill monitoring for axes 1 to 9

0.0010 to 30.0000 [mm]

The positioning window defines the limits within which the control considers

a position to have been reached. After the position has been reached, the

control begins running the next block. The position controller can correct a

disturbance inside this window without activating the "Return to the Contour"

In MP1030.x, define the size of the positioning window.

MP1030.0-8 Positioning window

0.0001 to 2.0000 [mm]

Once the axes have moved into the positioning window, the corresponding

bits are set in W1026. This also applies to the status after the machine control

voltage is switched on. Axes that are not used are considered to be in position.

The NC resets the bits as soon as you start a positioning movement or

traverse the reference marks.

In the ELECTRONIC HANDWHEEL mode of operation the bit for the current

handwheel axis is reset.

On contours that can be machined with constant surface speed, W1026 is not

Axes in position

Bits 0 to 8 correspond to axes 1 to 9

0: Axis not in positioning window

1: Axis in positioning window

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