Presentation for EEE Engineers

Topic: PLC for Modern automation

Presented byDilip Kumar Roy

B.Sc in EEEPRIME UNIVERSITY

2A/1, North East of Darus Salam Road, Mirpur Dhaka 1216.

Contents….

PLC

1. What is PLC?2. Why do we learn PLC?3. Types of PLC4. Brands of PLC 5. Statistic of using PLC6. Programming language of PLC7. Components of PLC8. Operation of PLC9. Application of PLC10.Job opportunity of PLC11.Advantages & Disadvantages12.Conclusion

What is PLC?

A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program to control the state of output devices.

Why do we learn PLC?

• In the recent years PLC plays a vital role in our automation sector. The production of Various industry like as Textile, Food & Beverage, Photochemical/chemical etc. are increasing because of using PLC.

• PLC also plays a vital role In the power sector, Aerospace & reduce complexity from various industrial sector.

• So, it don’t need to say that the use of PLC is now demand of time.

Types of PLCCompact PLC: It is built by several modules within a single case. Therefore, the I/O capabilities are decided by the manufacturer, but not by the user.

Modular PLC: is built with several components that are plugged into a common rack or bus with extendable I/O capabilities. It contains power supply module, CPU and other I/O modules that are plugged together in the same rack, which are from same manufacturers or from other manufacturers.

Soft PLC: It s an advanced PLC system that consists of compact, rack mounted components such as power supplies, I/O modules and a CPU, which embeds our powerful Soft PLC Control Software.

Brands of PLC • PLC is manufactured by some leading manufacturers. These are….

American:o Allen Bradley PLCo Gould Modicon PLCo Texas Instruments PLCo General Electric (GE) PLC

European:o Siemens PLCo Festo PLCo Telemechanique PLCo Klockner & Mouller PLC

Japanese:o Toshiba PLCo Mitsubishi PLCo Omron PLCo Fanuc PLC

Statistic of using various PLC

Programming language of PLC

• There are some programming languages to write program in PLC. These are….

• Ladder Diagram• Instruction List• Function Block Diagram• Sequential Function Chart• Structured Text• Etc.

Components of PLC

DescriptionCPU: It’s the unit that contains microprocessor.

Power supply unit: It’s needed to converted the main AC voltage to low DC voltage.

Input-output sections:These are where the processor receives information from external devices and communicates information to external devices.

Memory unit: It is where the program is stored that is to be used for control actions.Programming devices: It is used to entered the required program into the memory of processor.

Operation of PLCPLC operation…

Check input status: First the PLC takes a look at each I/O to determine if it is on or off.

Execute program: Next the PLC executes the program one instruction at a time.

Up date output status: Finally the PLC updates the outputs. It updates the outputs based on witch inputs were on during the first step.

Working Process of PLC

Simulated Ladder programming

• Scan program:o left to right.o Top to bottom

• Scan cycle:o 800-1000 scan/sec.

Application of PLC

Job opportunity of PLC

• Job opportunities….o Industrial Automation EngineeroPLC service EngineeroPLC programmeroBuilding Automation Engineero System Maintenance & Trouble ShootingoConsultancy & Technical Supporto Software modification to PLC, HMI,SCADAoProject Estimation & Managemento Equipment assembly & installationo Etc.

Advantages & DisadvantagesAdvantages Disadvantages

1. Increased reliability

2. More flexibility

3. Lower cost

4. Faster response

5. Easier to troubleshoot

6. Remote control capability

7. Communication Capability

1.Initial cost is high.

2. Increases unemployment rate.

3. If the PLC don’t running in your production time, the production of your company will be stopped.

Conclusion

• From the above discussion we need to come to the point that in the various industry, power sector and also various field the PLC provide a comfortable & riskless job environment.

• So, as an EEE engineer this is the right time to gather knowledge about PLC.

Thanks to all…Dilip Kumar