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Micro PLCs in Machine Development: Advantages, Differences, and Manufacturers

Discover the benefits of using micro PLCs in new machine development, learn how they compare to modular PLCs, and explore popular micro PLC models from top manufacturers.

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Micro PLCs in Machine Development: Advantages, Differences, and Manufacturers

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  1. Chapter 2 Micro Programmable Logic Controllers

  2. Objectives • Define a micro PLC. • Explain the advantages of using a micro PLC in new machine development. • Explain the difference between a micro PLC and a modular PLC. • Look at an overview of selected manufacturers’ micro PLCs.

  3. What Is a Micro PLC? • Typically 32 inputs and outputs or less • Self-contained units • Processor, power supply, and I/O built into one package

  4. Micro PLC Advantages • Package size smaller • Lower cost • Less complexity than larger PLCs • Easy installation

  5. Micro PLCs Versus Modular PLCs • Use when relay replacement and only basic control is desired. • Micro has smaller footprint. • Micro PLC is less complex than modular. • It is easy to embed micro into machine when only basic control is needed. • Limited instruction set means easier programming.

  6. Omron CPM1A Series Micro PLC • 10, 20, 30, or 40 I/O available • Hand-held programming or SYSMAC Windows-based software programming • Sinking, sourcing, or relay outputs • Two analog inputs and 1 analog output • Maximum 100 I/O points

  7. CPM1 Ten I/O Micro PLC Features Image courtesy of Omron Electronics, Inc.

  8. 3 MicroLogix 100 Micro Controllers and a Hand-held Programmer Image courtesy of Allen-Bradley, a Rockwell Automation business

  9. Specifications for Rockwell Automation’s MicroLogix 1500 Image courtesy of Allen-Bradley, a Rockwell Automation business

  10. MicroLogix 1500 Hardware Features Image courtesy of Allen-Bradley, a Rockwell Automation business

  11. Installing the Processor Unit in the MicroLogix 1500 PLC Image courtesy of Allen-Bradley, a Rockwell Automation business

  12. Simatic S7-200 Micro PLC Image courtesy of Siemens Energy & Automation, Inc.

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