plcs in A Sentence

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    Initially, Plcs had only discrete I/O.

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    Plcs are used in many industries and machines.

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    3

    Modern Plcs can be programmed in a variety of ways,

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    4

    These days Plcs are used in so many different industries and machines.

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    5

    Small Plcs have a fixed number of connections built in for inputs

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    6

    Small Plcs have a fixed number of connections built in for inputs and outputs.

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    7

    model has insufficient I/O. Modular Plcs have a chassis(also called an I/O rack)

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    8

    Plcs may include logic for single-variable feedback analog control loop, a proportional, integral, derivative(PID) controller.

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    9

    Plcs read limit switches, analog process variables(such as temperature and pressure), and the positions of complex positioning systems.

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    10

    Plcs read limit switches, analogue process variables(such as temperature and pressure), and the positions of complex positioning systems.

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    11

    The data handling, storage, processing power, and communication capabilities of some modern Plcs are approximately equivalent to desktop computers.

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    12

    PLC-like programming combined with remote I/O hardware, allow a general-purpose desktop computer to overlap some Plcs in certain applications.

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    13

    Most modern Plcs can communicate over a network to some other system, such as a computer running a SCADA(Supervisory Control And Data Acquisition) system or web browser.

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    14

    Initially most plc logic controller utilized Ladder Logic Diagram Programming, a model which emulated electromechanical control panel devices(such as the contact and coils of relays) which Plcs replaced.

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    15

    Plcs have built in communications ports usually 9-Pin RS232, and optionally for RS485 And Ethernet, Modbus, BACnet or DF1 is usually included as one of the communications protocols.

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    16

    Early Plcs, up to the mid-1990s, were programmed using proprietary programming panels or special-purpose programming terminals, which often had dedicated function keys representing the various logical elements of PLC programs.

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    17

    Plcs contain input and output devices compatible with industrial pilot devices and controls; little electrical design is required, and the design problem centers on expressing the desired sequence of operations.

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    18

    The main difference from most other computing devices is that Plcs are intended-for and therefore tolerant-of more severe conditions(such as dust, moisture, heat, cold), while offering extensive input/output(I/O) to connect the PLC to sensors and actuators.

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    19

    Modern Plcs can be programmed in a variety of ways, from the relay-derived ladder logic to programming languages such as specially adapted dialects of BASIC and C. Another method is state logic, a very high-level programming language designed to program Plcs based on state transition diagrams.

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