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  2. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    Compact PLC with 8 inputs and 4 outputs Modular PLC with EtherNet/IP module, discrete and analog I/O, with some slots being empty There are four types of mechanical design for PLC systems. A single box (also called a brick ) is a small programmable controller that fits all units and interfaces into one compact casing, although, typically ...

  3. Industrial control system - Wikipedia

    en.wikipedia.org/wiki/Industrial_control_system

    A feedback control loop is directly controlled by the RTU or PLC, but the SCADA software monitors the overall performance of the loop. For example, a PLC may control the flow of cooling water through part of an industrial process to a set point level, but the SCADA system software will allow operators to change the set points for the flow.

  4. AS-Interface - Wikipedia

    en.wikipedia.org/wiki/AS-interface

    Actuator Sensor Interface (AS-Interface or ASi) is an industrial networking solution (Physical Layer, Data access Method and Protocol) used in PLC, DCS and PC-based automation systems. It is designed for connecting simple field I/O devices (e.g. binary ON/OFF devices such as actuators, sensors, rotary encoders, analog inputs and outputs, push ...

  5. Open collector - Wikipedia

    en.wikipedia.org/wiki/Open_collector

    If all inputs are high, each buffer will be in a high-impedance state and the pull-up resistor will pull the output high. But if any input is low, the output will be pulled low by the buffer for that input. This corresponds to wired AND in active-high logic, or to wired OR in active-low logic, and allows multiple inputs to share the same output ...

  6. Function block diagram - Wikipedia

    en.wikipedia.org/wiki/Function_block_diagram

    The function block diagram (FBD) is a graphical language for programmable logic controller design, [1] that can describe the function between input variables and output variables. A function is described as a set of elementary blocks. Input and output variables are connected to blocks by connection lines.

  7. Integrated injection logic - Wikipedia

    en.wikipedia.org/wiki/Integrated_injection_logic

    The input is supplied to the base as either a current sink (low logic level) or as a high-z floating condition (high logic level). The output of an inverter is at the collector. Likewise, it is either a current sink (low logic level) or a high-z floating condition (high logic level).

  8. IEC 61131-3 - Wikipedia

    en.wikipedia.org/wiki/IEC_61131-3

    IEC 61131-3 is the third part (of 10) of the international standard IEC 61131 for programmable logic controllers.It was first published in December 1993 [1] by the IEC; the current (third) edition was published in February 2013.

  9. Fan-out - Wikipedia

    en.wikipedia.org/wiki/Fan-out

    Fan-out is ultimately determined by the maximum source and sink currents of an output and the maximum source and sink currents of the connected inputs; the driving device must be able to supply or sink at its output the sum of the currents needed or provided (depending on whether the output is a logic high or low voltage level) by all of the ...