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Introduction to the PLC

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Introduction to the PLC

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    2. History of PLCs Developed in 1971 Developed to replace relays, timers, & counters Progressed in late 1970’s Complex mathematical decisions Process control Future

    3. What is a Programmable Logic Controller? A Programmable Controller (PLC) is a specialized, factory-hardened computer

    4. Advantages of a PLC Smaller physical size than hard-wire solutions Easier and faster to make changes Internal Diagnostics Applications can be immediately documented Applications can be duplicated faster and less expensively

    5. Basic PLC Operation Input Modules bring in field signals Central Processing Units make decisions Output Modules control field devices

    6. What May be Added?

    7. What May be Added? Programming Devices

    8. What May be Added? Operator Interfaces

    9. PLC Scan

    10. Connections PLCs have connections to the outside world through: Discrete Inputs Discrete Outputs Analog Inputs Analog Outputs

    13. What is the CPU’s Function? The CPU has two main sections User Memory Decision Making

    14. What is Stored in User Memory? Information for temporary or permanent storage is kept in User Memory Math Results Product Count

    15. User Memory All computers, including PLCs, run on Binary (Base 2) numbers A Binary number can only be a 1 or a 0 A BIT is a single Binary digit

    16. User Memory Decimal System Ten digits Base 10 Weights 10, 100, 1000, ...

    17. User Memory Computer memory is measured in K K stands for KILO Kilo means thousand The closest round binary number to 1000 is 1024

    18. Types of Memory RAM - Random Access Memory Data can be written to and read from ROM - Read Only Memory Data can be read, but not written to EPROM - Erasable Programmable Read Only Memory Data can be written to, but is not easily altered

    19. Programming Three Standard Languages Ladder Logic Statement List Function Blocks Siemens Carries Seven Total Languages Add-ons

    20. Ladder Logic Ladder Logic (LAD) is the most common PLC programming language in the United States LAD was developed from electromechanical schematic symbols

    21. Statement List Statement List (STL) is the most common programming language outside of the United States Higher learning curve Faster to program

    22. Statement List LD I0.0 A I0.1 = Q0.0

    23. Basic PLC applications There are two types of PLC applications Machine Control Process Control

    25. Questions?

    26. Assignments Job #21

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