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    Road Map

    IntroductionBasic PLC components

    Introduction to STEP 7 LITE

    Programming PLC and Ladder logicExercises

    SCADA

    Future scope

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    Introduction

    A digitally operating electronic apparatus

    which uses a programmable memory for

    implementing specific functions such as :

    Logic sequencing

    Timing

    Counting

    Arithmetic controlthrough digital or analog

    input/output modules

    Invented in 1968 as a substitute for hardwired relay panels

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    Purpose of PLC & its

    functionsInitially designed to replace relay logic

    boards

    Accepts input from a series of switches

    Sends output to devices or relays

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    Functions

    On-off control,Sequential control,

    Feedback control, and

    Motion control

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    Basic PLC components

    I

    N

    P

    U

    T

    S CPU

    O

    UT

    P

    U

    T

    S

    POWER

    SUPPLY

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    Power Supply

    Every PLC has an external or internalIsolated Power Supply.

    Isolated Power Supplies can have more

    than one isolated output.

    Normally Power supplies are high voltage.

    Typically 24 Volts for industrial PLCs.

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    INPUTS & Outputs

    These are the physical connections from the real

    world to the PLC.Inputs can be limit switches, push buttons, andsensors, anything that can "switch" a signal on or off.

    Outputs are solenoids, lamps, contactors, relays etc,.

    The number of DI/Os can be increased by addingadditional DI/O

    modules

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    CPU

    CPU module mainly classified into

    three different parts based on their

    operation.

    Processor

    program memory

    serial communication ports

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    Scan cycle of PLC

    House keeping I/P scan

    O/P scan Program scan

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    STEP 7 LITE

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    STEP 7 LITE

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    Programming PLC

    FBD (Function block diagram)LD (Ladder diagram)

    ST (Structured text, similar to the Pascal

    programming language)IL (Instruction list, similar to assembly

    language)

    SFC (Sequential function chart).

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    Virtual relay components

    Virtual relay components

    Virtual relay components

    Power

    Rail

    Ground

    Rail

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    Exercises

    Direct online starterSequential switching of motors

    Fan control unit

    Tank level controllerTraffic light control

    Bottling Plant simulation

    V Y

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    SUPERVISORYCONTROL AND DATA

    ACQUISTION (SCADA)

    SCADA refers to combination of telemetryand Data acquisition. It consist of:

    Collecting data

    Transferring it back to control site

    Carrying out necessary analysis and control

    Displaying data on operator screens

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    TELEMETRY

    It is the technique used in transmitting and

    receiving information or data over a medium.

    Information can be Voltage, speed, level,

    temp, flow etc. Data is transmitted to another

    location through cables, Telephone, radio.Information may come from multiple

    locations.

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    DATA ACQUISTION

    It is method used to access and control

    information from equipment being

    controlled and monitored. The data

    accessed is then forwarded on to a

    telemetry system fro transfer to differentsites.

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    Future scope

    Study of :

    Interrupts

    Counters

    Communication Protocol:Profibus

    How to use communications to

    communicate with other PLCs,smart actuators and sensors, etc

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    THANK U

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