All instances of MachineToolTypein a Servershall be referenced from the Machines Objectas defined in OPC 40001-1. This provides the capability to easily find all machine tools managed in a Server.

The Machines Objectmay contain other nodes than instances of MachineToolType. As only the MachineToolTypeoffers the MachineIdentificationAddInas a subtype, no other type defined in this specification can be referenced directly from the Machines Object.