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  2. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    Then, the program is downloaded to the PLC directly or over a network. It is stored either in non-volatile flash memory or battery-backed-up RAM. In some programmable controllers, the program is transferred from a personal computer to the PLC through a programming board that writes the program into a removable chip, such as EPROM.

  3. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Often the ladder logic program is used in conjunction with a human–machine interface (HMI) program operating on a computer workstation. The motivation for representing sequential control logic in a ladder diagram was to allow factory engineers and technicians to develop software without additional training to learn a language such as FORTRAN ...

  4. CODESYS - Wikipedia

    en.wikipedia.org/wiki/CODESYS

    The five programming languages for application programming defined in the IEC 61131-3 are available in the CODESYS development environment.. IL (instruction list) is an assembler-like programming language.

  5. SCADA - Wikipedia

    en.wikipedia.org/wiki/SCADA

    It refers to the computer and software responsible for communicating with the field connection controllers, which are RTUs and PLCs, and includes the HMI software running on operator workstations. In smaller SCADA systems, the supervisory computer may be composed of a single PC, in which case the HMI is a part of this computer.

  6. Programmable logic device - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_device

    Unlike for microprocessors, programming a PLD changes the connections made between the gates in the device. PLDs can broadly be categorised into, in increasing order of complexity, simple programmable logic devices (SPLDs) , comprising programmable array logic , programmable logic array and generic array logic ; complex programmable logic ...

  7. Function block diagram - Wikipedia

    en.wikipedia.org/wiki/Function_block_diagram

    Function Block Diagram is one of five languages for logic or control configuration [2] supported by standard IEC 61131-3 for a control system such as a programmable logic controller (PLC) or a Distributed Control System (DCS). The other supported languages are ladder logic, sequential function chart, structured text, and instruction list.