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Prgrammable Logic Controller

Prgrammable Logic Controller

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PLC PLC Presentation Transcript

  • Programmable Logic Controllers
  • Organization of the Presentation
    • Introduction
    • Components of PLC
    • PLC Functioning
    • PLC Programming
    • Example Problems
    • Applications
    • PLC Selection
  • Introduction
  • PLC Defined
    • Programmable Logic Controller (PLC) is a solid state device designed to perform logic functions.
    • Essentially PLC is an assembly of solid state digital electronic elements designed to make logical decisions and provide outputs
  • Why PLC
    • Relay based Process or Machine Control is expensive and Rigid
    • Need for programmable and reconfigurable control
    • Move towards Flexible Automation
  •  
  • Areas of Application
    • Process control
    • Control of Machinery
    • Control of Equipments
    • Certain Aspects of Control in CNC machines and Machining Centers
  • Components of PLC
  • PLC Components
    • Any PLC Has
    • 1. A Central Processing Unit (CPU)
    • Microprocessor based system
    • 2. Input / Output Section (I/O Section)
    • Digital and analog I/O s
    • 3. Programming Device
    • Usually a Computer
  • 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
    • On Delay Timers
    • Off delay timers
    • Retentive Timers
  • Counters
    • Up Counters
    • Down Counters
    • Up Down Counters
  • Relays
    • Internal Relays
    • External Relays
    • Retentive Relays
  • 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 moves the Product to A and stops Distance to A counted by encoder (8 Pulses) Waits at A for 10 s Moves again to LS2 and stops Emergency stop Emergency stop resets counter and timer
  •  
  • Applications
  • Process Control
    • Electroplating
    • Heat Treatment
    • Powder Coating
    • Chemical Processing
    • Refineries
    • Control of Hydraulic and Pneumatic Circuits
  • Control of Machinery and Equipment
    • Control of Material Handling Equipments like Conveyer Belts
    • Control of Flexible, Automated Assembly Lines
    • Control of Special Purpose Machines like Bottling Machine etc.
  • CNC Machines
    • velocity, displacement and position control is being carried out by exclusive controllers (Hardware interpolators, Closed Loop Controllers etc..)
    • Mostly all ‘M’ codes are transferred to PLC Control
    • PLC Provides one more level of Protection in CNC Machines
  • Machining Centers
    • Automatic Tool Changers
    • Automatic Pallet Changers
    • Overall system protection
  • PLC Selection
  • Criteria for Selecting PLC
    • Number of logical inputs and outputs.
    • Memory
    • Number of special I/O modules
    • Scan Time
    • Communications
    • Software
  • Typical PLC Specification
  • Commercial PLC Manufacturers
      • Omron Electronics Inc.
      • Allen Bradley
      • Aromat
      • GE-Fanuc
      • IDEC
      • Keyence
        • Mitsubishi
        • Modicon
        • Omron
        • Automation Direct
        • Siemens
        • Toshiba
  • PLC Manufacturers Websites
    • Aromat
      • http://www. aromat .com
    • Keyence
      • http://www. keyence .com/ plc /start. htm
    • Toshiba
      • http://www. toshiba .com.au/ plc /index.html
  • Some Interesting PLC Websites
    • http://claymore.gvsu.edu/~jackh/books/plcs/
    • http://www.plcs.net
    • http://www.geindustrial.com/cwc/solutions ?
  • Reference
    • Programmable Logic Controllers by Frank D Petruzella, McGraw – Hill Books Companey, 1989.
  •  
  • Thank You