Homing interfaces

The figure shows the NC controller with its interfaces related to homing. Homing the assigned axes can be commanded in the individual channels either in

• “Homing” mode or with the
• NC command G74

in the NC program. Homing must be parameterised for every NC axis in the axis parameter list.

CNC interface

Referring to homing, the CNC has an object interface for the

• GUI to command homing and
• to request the axis status from the controller.

HLI interface

The HLI interface is a memory-coupled interface for the NC controller to communicate with the PLC. This interface is described in detail in [HLI]. The HLI interface is used to:

• command homing and
• request the axis status.

The cam signal is supplied to the NC via the HLI interface,. The periphery reads the cam signal and writes the signal to the HLI interface. This is executed in the PLC (see also [HLI]).

Drive interface

The drive interface is used to connect NC axes to the controller via various drive types.