Copyright © 2002 Delmar Thomson Learning Chapter 2 Micro Programmable Logic Controllers

Copyright © 2002 Delmar Thomson Learning

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 unitsProcessor, power supply, and I/O

built into one package


Micro PLC Advantages

Package size smallerLower costLess complexity than larger PLCsEasy installation


Micro PLCs Versus Modular PLCs

Use when relay replacement and only basic control is desired.

Micro has smaller footprint.Micro PLC less complex than

modular.Easy to embed micro into machine

when only basic control is needed.Limited instruction set means easier

programming.


Omron CPM1A Series Micro PLC

10, 20, 30 or 40 I/O availableHand-held programming or SYSMAC

Windows-based software programming

Sinking, sourcing, or relay outputsTwo analog inputs and 1 analog

output.Maximum 100 I/O points


CPM1 Ten I/O Micro PLC Features

Image courtesy of Omron Electronics, Inc.


3 MicroLogix 100 Micro Controllers and a Handheld

Programmer

Image courtesy of Allen-Bradley, a Rockwell Automation business


Specifications for Rockwell Automation’s MicroLogix

1500



MicroLogix 1500 Hardware Features



Installing the Processor Unit in the MicroLogix 1500 PLC



Simatic S7-200 Micro PLC

Image courtesy of Siemens Energy & Automation, Inc.

Documents

Copyright © 2002 Delmar Thomson Learning Chapter 2 Micro Programmable Logic Controllers