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2. Programmable logic controller - Wikipedia

   en.wikipedia.org/wiki/Programmable_logic_controller

   The PLC originated in the late 1960s in the automotive industry in the US and was designed to replace relay logic systems. [2] Before, control logic for manufacturing was mainly composed of relays, cam timers, drum sequencers, and dedicated closed-loop controllers.

3. Control system - Wikipedia

   en.wikipedia.org/wiki/Control_system

   The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero." [2]

4. Industrial control system - Wikipedia

   en.wikipedia.org/wiki/Industrial_control_system

   An industrial control system (ICS) is an electronic control system and associated instrumentation used for industrial process control. Control systems can range in size from a few modular panel-mounted controllers to large interconnected and interactive distributed control systems (DCSs) with many thousands of field connections.

5. SCADA - Wikipedia

   en.wikipedia.org/wiki/SCADA

   SCADA (an acronym for supervisory control and data acquisition) is a control system architecture comprising computers, networked data communications and graphical user interfaces for high-level supervision of machines and processes.

6. Operational technology - Wikipedia

   en.wikipedia.org/wiki/Operational_Technology

   The term usually describes environments containing industrial control systems (ICS), such as supervisory control and data acquisition (SCADA) systems, distributed control system (DCS), remote terminal units (RTU) and programmable logic controllers (PLC), as well as dedicated networks and organization units. The built environment, whether ...

7. Distributed control system - Wikipedia

   en.wikipedia.org/wiki/Distributed_control_system

   A distributed control system (DCS) is a computerized control system for a process or plant usually with many control loops, in which autonomous controllers are distributed throughout the system, but there is no central operator supervisory control. This is in contrast to systems that use centralized controllers; either discrete controllers ...