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Programable Electronic Controller (PLC)

The following technical information is From Automation Direct.com

What is a PLC?

Considerations for Choosing a PLC

Example Programs

A Condensed Guide to Automation Control System Specification, Design and Installation - T. Elavsky - Automation Direct
Part 1: System Identification and Safety
Part 2: Control Device Specification
Part 3: Design

Connecting 3-wire sinking and sourcing devices to PLC input modules

Motion Control System Choices

Relays Show Staying Power: As Their Control Capabilities Increase, Relays Encroach on PLCs - Jim McConahay contributes to this article outlining advantages of relays and programmable relays over PLCs. Relays have many electrical and safety advantages over PLCs, and programmable relays can outshine PLCs in real-time control and monitoring. From Moore Industries-Pacific, Inc. and Control Design.

Automating Manufacturing Systems with PLCs- This is a sensational 846 page book full of information on PLCs, logic design, Sensors etc -from Grand Valley State University and written by Hugh Jack- A 5.4Mbit download but worth the wait!

PLCs- Terminology,Tools, Tables and Calculators- From Controlsweekly.com

PLC Glossary of Terms -A complete glossary of the most often used terms in PLC systems- from www.industrialtext.com

PLC Primer - A very useful 16 page document from www.industrialtext.com with all the basics about PLCs

PLC Basics - A fantastic 39 page tutorial and associated exam from Eaton Electrical

PLC Resource - Lots of great technical papers and tools here- From PLC Open

Your Personal PLC Tutor Site - From PLCs.net

PLC Basics- From the PLC Man

Basics of PLCs- A tutorial from Siemens

8.10 Primer on Programmable Controllers - Thomas A. Hughes - A useful introduction to PLCs which details basic components, I/O System & Structure along with  Input & Output Types - from ISA and InTech.