Links to some of our favorites

A PLC programming book by Hugh Jack (this is a must read and its free) http://engineeronadisk.com/

Free PLC Simulator, learn the basics of PLC programming http://www.plcfiddle.com/#

Spread the word Manufacturing Day - Join in educating America manufacturing http://www.mfgday.com/

Programming and Automation forums

http://www.plctalk.net/qanda/

Information Resources and free material

http://engineeronadisk.com/ A ton of free engineering information

Lessons In Industrial Instrumentation Not for the beginner but a good read (Large PDF)

https://accautomation.ca/ A lot of information about PLC's and PLC programming specializing in Automation Direct

www.skycad.ca Electrical drawing software (CAD software) with a Free standard license

Legacy Allen Bradley PLC upgrades

http://softplc.com/products/migrations/oldtopdoc/ If your looking to upgrade some old Allen Bradley PLC's

Recommended Training courses

http://www.troubleshootingbootcamps.com/ Electrical and PLC Training by Randy Craps

Engineers without borders

http://www.ewb-international.org/ International

About PLC's

The first PLC was in 1970 at the GM Ypsilanti plant, see here for a good read https://www.controleng.com/articles/inside-the-competition-for-the-first-plc/

YouTube Videos

http://www.youtube.com/user/PLCCable