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Introduction to PLCs

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Introduction to PLCs. MAIN 222 Industrial Controllers. Introduction. Why Automate? At the end of this lesson you will be able to define PLC definitions and simple operations of a PLC. What is difference between Relay Logic and PLC logic Where is it used. Why Use A PLC.

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Introduction to PLCs

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  1. Introduction to PLCs MAIN 222 Industrial Controllers

  2. Introduction • Why Automate? • At the end of this lesson you will be able to define PLC definitions and simple operations of a PLC. • What is difference between Relay Logic and PLC logic • Where is it used

  3. Why Use A PLC • Gain Complete Control • Achieve Consistency • Improve Quality and Accuracy • Work in Difficult Environment • Increase Productivity • Lower Cost to make Product • Control Inventory

  4. What Makes A PLC Work

  5. Vocabulary • Memory • Inputs • Outputs • I/O • Address • Status Table • See p1-6 of Series 90 Micro Workshop

  6. Vocabulary • Normally Open Contacts • Normally Closed Contact • PID • Scan Time • Register • Flash Memory • See p 1-7 Series 90 Workshop

  7. GE Specific / Digital Terms • Super Cap • PWM • SNP • P/S • Byte • Word • And • Or

  8. PLC Configurations • Integral or a shoebox or small brick sized device • Series 90 Micro GE Fanuc PLc • Advantages less expensive small • Disadvantages not repairable limited I/O limited I/O types

  9. PLC Configurations • Modular I/O cards fit in a rack • Series 90-30 or Series 90-70GE Fanuc PLC • Advantages repairable , flexible • Disadvantages expensive, larger in size

  10. Summary • There are many different types of PLCs • GE • Allan Bradley • All must use the same common micro controller system of working • All use digital controls bits to address and register information

  11. Where to Get More Information • www.plcs.net • Series 90-30 X Student Guide

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