Extensive data volumes are exchanged between the CNC and the PLC. For example, this comprises

The interface between CNC and PLC is outlined in the overview diagram below.

CNC-PLC interface
CNC-PLC interface

This documentation describes the structure of this interface between CNC and PLC referred to below as High-Level Interface (HLI for short).

The term “High-Level Interface”, in this context, refers to the structure of the interface with complex data structures and handshake variables. This has to be seen in contrast to a data interface, which us considered to be at a low level of abstraction (Low-Level Interface).