Basics of PLC
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This PPT is based on the basic concepts of PLC . This will make you understand important concepts of PLC and clear out the doubts about this devices. this is nowdays a popular device and widely used in various applications for automation in different industries and other places etc.
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Programmable logic controllers (PLCs) are digital electronic devices used to automate industrial processes. A PLC consists of a central processing unit, input/output modules, and a programming device. PLCs scan their program continuously and cyclically to monitor inputs and control outputs. They are programmed using ladder logic to perform functions like timing, counting, and controlling relays. PLCs are used widely in applications like process control, machinery control, and some CNC machine functions. Factors like the number of I/O points, memory, and scan time are considered when selecting a suitable PLC for an application.
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This document provides an overview of a basic PLC training course. It describes the major components of a PLC including the processor, memory, I/O modules, and programming device. It also outlines the course contents which will cover the history of PLCs, programming concepts, applications, and troubleshooting. The objectives are for participants to understand PLC components, programming, applications, and basic troubleshooting.
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Basics of PLC
- 1. PLC (Programmable Logic Controller) Presented by : Mohit Ojha
- 2. Contents : What is PLC? Leading Manufacturers of PLC Need of PLC in Automation Block diagram of PLC PLC Instruction set Nomenclature in Programming PLC How it can be programmed? Understanding Ladder Logics Where to use PLC? Advantages Disadvantages
- 3. What is PLC? PLC is a Programmable Logic Controller , which is in solid state /computerized industrial controller which performs discrete or sequential logic in industrial environment. It is a digital operating electronic device which consist of internal memory to store the program to perform specific functions such as logic , sequence , counting , timing etc.
- 4. Leading Manufacturers of PLC :
- 6. Need of PLC in Automation In automation of Industries , Plants or Processes. Developing a control system for controlling and monitoring it. Efficient working. Easy and economical solutions for automation. Improve mass productivity of large scale industries Maintain the quality and quantity of material Avoids severe accidents and errors. Reduces the manpower. Higher accuracy in less time while production.
- 7. Block Diagram of PLC
- 8. PLC instruction set NORMALLY OPEN (NO) : NORMALLY CLOSED (NC) : Contact State of contact Contact act as NO 1 (ON) close switch 0 (OFF) open switch Contact State of contact Contact act as NC 1 (OFF) close switch 0 (ON) open switch
- 9. CONTACT COIL OR OUTPUT COIL : INVERSE CONTACT OR OUTPUT COIL : SET INSTRUCTION OR SET COIL : RESET INSTRUCTION OR RESET COIL :
- 10. Nomenclature in Programming PLC : Nomenclature Stands for M Memory bit of internal memory X Physical Inputs of PLC Y Physical Outputs of PLC T Internal Timers C Internal Counters S SET R RESET F For designing a Function Block
- 11. How it can be Programmed? PLC programming languages : Graphical languages : Ladder Logic Diagram (LD) Function Block Diagram (FBD) Sequential Function Chart (SFT) Text based languages : Instruction list (IL) Structured text (ST)
- 12. Understanding Ladder Logics : A B O/P 0 0 0 0 1 0 1 0 0 1 1 1 A B O/P 0 0 0 0 1 1 1 0 1 1 1 1 A B O/P 0 0 1 0 1 1 1 0 1 1 1 0 A B O/P 0 0 1 0 1 0 1 0 0 1 1 0 A B O/P 0 0 1 0 1 0 1 0 0 1 1 1 A B O/P 0 0 0 0 1 1 1 0 1 1 1 0 AND gate : OR gate : NAND gate : NOR gate : EX-OR gate : EX-NOR gate : A O/P 0 1 1 0 NOT gate :
- 13. Where to use PLC? Textile Industries : Automatic Jigger Dyeing Machine Speedframe Machine automation Other Industries : Pump and Motor Control applications Cooling towers Water level controller and monitoring Automation of flood gates of Dams etc.
- 14. Automatic Electronic Jigger Dyeing Machine
- 18. ADVANTAGES : Faster scan time. Intelligent input/output modules. High speed Reliable Minimum maintenance. Flexibility in programming and reprogramming. Small in size. Easier modification. A wide range of control application. Capable to communicate with computers in plant. Troubleshooting programs in easy which reduces downtime.
- 19. DISADVANTAGES : Some PLC’s turn ON , when the power is restored which may cause any accident. For specific small scale industries electromechanical systems like Relay based systems are less costly than PLC. PLC gets affected under high temperature, vibrations conditions but both of these can be overcome while installation of PLC.
- 20. THANK YOU ...!!!