Programming Logic Controllers PowerPoint Presentation

Programming Logic Controllers PowerPoint Presentation

2018-11-04 2K 2 0 0

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Input. /Output Devices & Motor Controls - . Chapter . 4. PLC Control. Output control. Turn on/off a circuit. Increase/decrease . motor speed or torque. Input parameters. Temperature. Pressure. Humidity . ID: 713760

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Presentations text content in Programming Logic Controllers

Slide1

Programming Logic Controllers

Input

/Output Devices & Motor Controls -

Chapter

4

Slide2

PLC Control

Output control

Turn on/off a circuit

Increase/decrease motor speed or torqueInput parametersTemperaturePressureHumidity Time

Slide3

Pushbuttons and Switches

Discrete input devices

either on or off

Connected to PLC inputsWhen ON they place a positive voltageWhen OFF they apply zero voltage to the port(NO) Normally open – on until switched off(NC) Normally closed – off until switched on

Slide4

PushbuttonsMomentary

Must hold open/closed

Return to normal position when released

Locked-positionLatch until state changed again physically

Slide5

Switches

Manual

Require human intervention

AutomaticMechanical or electricalThermostatLimit switch

Slide6

Switches cont’d

Temperature

Switch

Pressure SwitchLiquid level SwitchFlow SwitchFloat Switch

Foot

Switch

Proximity Switch

Led + phototransistor

Slide7

Sensors

Digital – high low voltage

Analog – varying voltage levels

Proximity SensorsInductive Sensor – detects current induced from magnetic fields to detect metalCapacitive Sensor – measures change in

sensors

dielectric caused by nearby objects

Optical sensors

Emitter + detector

Visible, ultraviolet, infrared, or laser

Reflection varies with object type

Slide8

Hall Effect Sensor

Reed switch

Switched by

magnetic fields pull or pushSolid stateResist vibrationRelay used wire coil to generate magnetic field

Reed switch used permanent magnate

Slide9

Ultrasonic Sensor

Above 16kHz sound ping (like submarine)

Time for reflected sound to return proportional to object’s distance

Accurate over short distances and cheapElectrostatic up to 50kHzCapacitive Longer range but sensitive to environment

Piezoelectric

up to

1MHz

Rugged

Crystal lattice produces voltage

Slide10

RADAR Sensors

Radio Detection and Ranging

Detect metal

objectsNot used in factories

Slide11

Cameras & Object Recognition Software

Can identify defects

Detecting which parts

Quality assuranceGetting better

Slide12

Indicators

Pilot lights

Red yellow green for states/conditions

Ammeters & VoltmetersLooking for undervoltage or overcurrent conditions

Slide13

Relays & Contactors

Relay

like a reed switch but with a coil

energized (magnetized) de-energized (demagnetized)Power relay (contactor) or control relay (relay)Contactor

Power relay

Uses a small amount of voltage to

control

a large amount

Solid state relays

No moving parts to wear out

perform well in harsh environments

Slide14

Solenoids

Convert electrical energy into mechanical motion

Movable plunger at core with spring

When energized plunger is pulledWhen de-energized spring reverses action

Slide15

Motor Control

Motor Starters

Constant speed motors (on/off)

Contactors and Overload protection overload relaysTemperature or thermal overload relay - commonMagnetic overload relay - faster but $$$Motor DrivesSoft start stand still to operating speedPlugging when motor reverses direction

Slide16

Electrical Symbols

http://www.techtransfer.com/resources/wiki/entry/1829/#

Contacts

Slide17

Electrical Symbols

http://

www.wadeinstruments.com/ez_schematics/description.htm

Slide18

http://www.wadeinstruments.com/ez_schematics/description.htm

Slide19

http://www.industrial-electronics.com/image/15-5.jpg


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