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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
A Condensed Guide to Automation
Control System Specification, Design and Installation - T. Elavsky - Automation
Part 1: System Identification and Safety
Part 2: Control Device Specification
Part 3: Design
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 ElectricalPLC 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
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.
the Workhorse of Engineering Industry – the PLC - Steve
Mackay -One of the workhorses in industry – no matter whether you are in
industrial automation, electrical or mechanical engineering, you are likely to
be confronted with one of these little fellahs - a Programmable Logic Controller
or PLC (or indeed, Programmable Automation Controller – PAC). A critical
cheap building block for all automated systems. Effectively, an industrially
hardened digital electronic device in which a sequence of instructions are
stored, which enable the PLC to replace hard wired relay logic and perform
counting, sequencing and timing. As well, as reading analog inputs (e.g. from a
flow meter) and outputting analog output control signals to valves and other
control devices. A few tips on troubleshooting these devices are detailed in
this blog (yes – the veterans amongst you will sigh, when you know your
enormous depth of experience built up to do this – as against my short note
below). I have presumed in the suggestions on troubleshooting, that your PLC has
been operating correctly and there are no recent program changes.