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Posted
It's not enought to just learn the ladder logic taught in PLC instruction manuals. A person should really start with learning about hardwired relay logic circuits. This will allow them to better understand why stop PBs need to be N.C. contacts and other fail safe type concepts. Try books by this guy http://www.coxco.net/ His motor control and PLC books are very easily understood and useful.
Posted (edited)
This is a good place to start: http://www.plcs.net/contents.shtml Edited by Nathan

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