# PLC as Master

A dynamic coordinate system can be defined by a CNC channel or by the PLC. The HLI has a control unit for this.

Dynamic coordinate system by PLC

## States of the tracking slave

INACTIVE | The slave does not track the dynamic coordinate system.
ACTIVATING | The first time the tracking function is activated, the salve adopts the changes “softly” via a filter.
ACTIVE | The slave tracks the dynamic coordinate system.
DEACTIVATING | The slave “softly” decouples dynamic coordinate system tracking.
ERROR | An error occurred in the slave. The slave is unable to track the dynamic coordinate system.

## Additional information

- Control unit