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Programmable Logic Controllers

Organization of the Presentation <ul><li>Introduction </li></ul><ul><li>Components of PLC </li></ul><ul><li>PLC Functionin...

Introduction

PLC Defined <ul><li>Programmable Logic Controller (PLC) is a solid state device designed to perform logic functions. </li>...

Why PLC <ul><li>Relay based Process or Machine Control is expensive and Rigid </li></ul><ul><li>Need for programmable and ...

Areas of Application <ul><li>Process control </li></ul><ul><li>Control of Machinery </li></ul><ul><li>Control of Equipment...

Components of PLC

PLC Components <ul><li>Any PLC Has </li></ul><ul><li>1. A Central Processing Unit (CPU) </li></ul><ul><li>Microprocessor b...

PLC Components

PLC Functioning

PLC’s Perform Scans Sequentially and Cyclically

Typical PLC Scan Sequence

PLC programming

Typical Inputs and their Representation

Inputs (Continued )

Inputs (Continued )

Inputs (Continued )

Inputs (Continued )

An Electro Mechanical Relay

Typical Outputs and Their Representation

Timers <ul><li>On Delay Timers </li></ul><ul><li>Off delay timers </li></ul><ul><li>Retentive Timers </li></ul>

Counters <ul><li>Up Counters </li></ul><ul><li>Down Counters </li></ul><ul><li>Up Down Counters </li></ul>

Relays <ul><li>Internal Relays </li></ul><ul><li>External Relays </li></ul><ul><li>Retentive Relays </li></ul>

Example Programs

Design a Control Program for a Water Pump Motor

Product in Position (LS1 Close) Start button on. Conveyer moves product to A (Limit switch LS1 returns to normal) Conveyer...

Applications

Process Control <ul><li>Electroplating </li></ul><ul><li>Heat Treatment </li></ul><ul><li>Powder Coating </li></ul><ul><li...

Control of Machinery and Equipment <ul><li>Control of Material Handling Equipments like Conveyer Belts </li></ul><ul><li>...

CNC Machines <ul><li>velocity, displacement and position control is being carried out by exclusive controllers (Hardware i...

Machining Centers <ul><li>Automatic Tool Changers </li></ul><ul><li>Automatic Pallet Changers </li></ul><ul><li>Overall sy...

PLC Selection

Criteria for Selecting PLC <ul><li>Number of logical inputs and outputs. </li></ul><ul><li>Memory </li></ul><ul><li>Number...

Typical PLC Specification

Commercial PLC Manufacturers <ul><ul><li>Omron Electronics Inc. </li></ul></ul><ul><ul><li>Allen Bradley </li></ul></ul><u...

PLC Manufacturers Websites <ul><li>Aromat </li></ul><ul><ul><li>http://www. aromat .com </li></ul></ul><ul><li>Keyence </l...

Some Interesting PLC Websites <ul><li>http://claymore.gvsu.edu/~jackh/books/plcs/ </li></ul><ul><li>http://www.plcs.net </...

Reference <ul><li>Programmable Logic Controllers by Frank D Petruzella, McGraw – Hill Books Companey, 1989. </li></ul>

Thank You

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