PLC-3SDGSFSDFAGFDSGSGAGGASGSDAGSADGADSG.pptx

YHRUJSJRJHDSJFDNDFNFNFHGNDFNHFDNMHMNHFMHMHMHJJTDHDSGHSDHJGSHHVHBNGSHSGHGHSHGSHGHHHEFAOHHLKH;LH;OLHGOUHGUOHPOUUHUOHOPUHPOHPOUHOHOGOUHOUPHOH

1. Programmable Logic Controllers (PLCs) [introduction] By   Eng. Fathy Aly Mohamed

2. Objectives 1- What is a PLC 2- Advantages of PLCs 3-Types of PLCs 4- PLC hardware 5- Architecture of a PLC 6- How does it work 7- Inputs 8- Outputs 9- PLC selection

3. What is a PLC - PLC (Programmable Logic Controller) is a computer type device used to control equipment(s) in an industrial facility. The first PLC was developed by Richard Morley in 1969 for general motors company. - PLC is an industrial computer that receives inputs from input devices and then evaluates those inputs in relation to stored program logic and generates outputs to control peripheral output devices. - PLC is a special form of microprocessor- based controller that uses a programmable memory to store instructions and to implement functions such as logic, sequencing, timing, counting and arithmetic in order to control machines and processes and are designed to be operated by engineers with perhaps a limited knowledge of computers and computing languages . - PLC is a digital computer used for automation of electromechanical processes.

4. Applications of PLCs PLCs are used in a great many real-world applications such as: - Wastewater treatment, - Machining, - Packaging, - Robotics, - Materials handling, - Automated assembly, and countless other industries are using PLCs extensively. Those who are not using this technology are wasting money, time, quality, and competitiveness. Almost all application that use electrical, mechanical, or hydraulic devices have a need for PLCs.

5. Advantages of PLCs 1- Rugged and designed to withstand vibrations, temperature, humidity and noise. 2- Have interfacing for inputs and outputs already inside the controller. 3- Are easily programmed and have an easily understood programming language which is primarily concerned with logic and switching operations. 4- Small size. 5- Computing capabilities. 6- Low cost. 7- High reliability. 8- Expandability.

6. Types of PLC Compact type: All in one module There are two types with respect to power supply of CPU, I/Ps and O/Ps: 1- DC/DC/DC 2- AC/DC/Relay

7. Types of PLC Modular type: - Power supply module - CPU module - DI modules - DO modules -AI modules -AO modules -Interface module - Function module

8. PLC hardware

9. Architecture of a PLC

10. Architecture of a PLC

11. How does it work

12. How does it work

13. INPUTS PLC system contains inputs: 1) Discrete Inputs - On/Off type Pushbuttons Switches Limit Switches Selector Switches Proximity sensors Photo - electric sensors 2) Analog Inputs Resistance Temp. Detectors Thermo – couple Pressure, level, flow rate, …….transducers. 3) Pulse inputs ( high speed ) Encoders

14. INPUTS Types of inputs:

15. INPUTS PNP NPN

16. Input Modules The input module performs tasks electronically as: Determines the presence or absence of input Converts input single to a DC level useable PLC Provides Electronic isolation between input signal & PLC

17. INPUTS Analog input signals: 1 to 5 V 0–10 V 4–20 mA 0-20 mA Special signals for temperature sensors

18. OUTPUTS PLC system contains  outputs as: Solenoids Relays Contactors Motor Starters Indication Lights Valves Alarms

19. OUTPUTS Analog output signals: 1 to 5 V 0–10 V 4–20 mA 0-20 mA

20. PLC selection Voltage and current supply Speed Memory size No. and types of inputs No. and types of outputs