Order Communications System. One of the initial components of a hospital information system, such as requests for blood tests to be performed by a laboratory, or medications to be dispensed by the pharmacy.

Open Control System. This term is sometimes used to emphasise the lack of proprietary architecture. ABB include the term in their DCS brandname, Advant OCS.

Online Community System

Object Coordinate System (also known as ECS, Entity Coordinate System).

A manufacturing system that is based on a set of commercially available, standards-based technologies, and that permits the open exchange of process data with plant systems and business systems throughout a manufacturing enterprise. "Control" refers to process control for discrete, batch and continuous-process manufacturing, as well as computer numerical control and other motion controls.

Operation and control system. See also: DCS

Occupancy Control System