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2. Programmable logic controller - Wikipedia

   en.wikipedia.org/wiki/Programmable_logic_controller

   A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.

3. Ladder logic - Wikipedia

   en.wikipedia.org/wiki/Ladder_logic

   Note: In this example, "Run" represents the status of a bit in the PLC, while "Motor" represents the actual output to the real-world relay that closes the motor's real-world circuit. For safety reasons, an emergency stop ("ES") may be hardwired in series with the "Start" switch, and the relay logic should reflect this.

4. Instruction list - Wikipedia

   en.wikipedia.org/wiki/Instruction_list

   Many vendors whilst incorporating the full IEC 61131-3 requirements have additional vendor specific calls/function blocks to suit their hardware such as reading or writing to I/O. Siemens PLC instruction list language is known as "Statement List" or "STL" in English, and "Anweisungs-Liste" or "AWL" in German, Italian and Spanish.

5. SCADA - Wikipedia

   en.wikipedia.org/wiki/SCADA

   This allows SCADA system engineers to perform both the design and implementation of a program to be executed on an RTU or PLC. A programmable automation controller (PAC) is a compact controller that combines the features and capabilities of a PC-based control system with that of a typical PLC. PACs are deployed in SCADA systems to provide RTU ...

6. Distributed control system - Wikipedia

   en.wikipedia.org/wiki/Distributed_control_system

   The processors receive information from input modules, process the information and decide control actions to be signalled by the output modules. The field inputs and outputs can be analog signals e.g. 4–20 mA DC current loop or two-state signals that switch either "on" or "off", such as relay contacts or a semiconductor switch.

7. Sequential function chart - Wikipedia

   en.wikipedia.org/wiki/Sequential_function_chart

   Basic Batch SFC, with important elements labeled. Main components of SFC are: Steps with associated actions; Transitions with associated logic conditions; Directed links between steps and transitions. Steps in an SFC diagram can be active or inactive. Actions are only executed for active steps. A step can be active for one of two motives: