chapter 02 micro plcs
DESCRIPTION
nmnnmnTRANSCRIPT
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Chapter 2
Micro ProgrammableLogic Controllers
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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.
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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
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Micro PLC Advantages
• Package size smaller• Lower cost• Less complexity than larger PLCs• Easy installation
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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.
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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
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CPM1 Ten I/O Micro PLC Features
Image courtesy of Omron Electronics, Inc.
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3 MicroLogix 100 Micro Controllers and a Hand-held Programmer
Image courtesy of Allen-Bradley, a Rockwell Automation business
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Specifications for Rockwell Automation’s MicroLogix 1500
Image courtesy of Allen-Bradley, a Rockwell Automation business
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MicroLogix 1500 Hardware Features
Image courtesy of Allen-Bradley, a Rockwell Automation business
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Installing the Processor Unit in the MicroLogix 1500 PLC
Image courtesy of Allen-Bradley, a Rockwell Automation business
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Simatic S7-200 Micro PLC
Image courtesy of Siemens Energy & Automation, Inc.