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ntroductionofProgrammablecontrollersFromasimpleheritage,theseremarkablesystemshaveevolvedtonotonlyreplaceelectromechanicaldevices,buttosolveanever-increasingarrayofcontrolproblemsinbothprocessandreprocessedindustries.Byallindications,thesemicroprocessorpoweredgiantswillcontinuetobreaknew