Here are the links to (most) all my PLC and PLC programming posts so far.
S88: More Than Batch Control
PLC Programming Basis: Survey Results
PLC or PAC? VFD or VSD?
How do you program the PLC?
Finite State Machines: The Concepts Simplified
PLC Tip: Taming the Gremlin in PID Control Update Timing
PLC Tip: Watching Out for PLC Scan Gotchas!
Updated 8/8/2010
Harold On Controls 
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