Chapter 2 Micro Programmable Logic Controllers Objectives Define

Chapter 2 Micro Programmable Logic Controllers

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.

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

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

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.

Omron CPM 1 A 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

CPM 1 Ten I/O Micro PLC Features Image courtesy of Omron Electronics, Inc.

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

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

Micro. Logix 1500 Hardware Features Image courtesy of Allen-Bradley, a Rockwell Automation business

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

Simatic S 7 -200 Micro PLC Image courtesy of Siemens Energy & Automation, Inc.