ntroductionofProgrammablecontrollersFromasimpleheritage,theseremarkablesystemshaveevolvedtonotonlyreplaceelectromechanicaldevices,buttosolveanever-increasingarrayofcontrolproblemsinbothprocessandreprocessedindustries.Byallindications,thesemicroprocessorpoweredgiantswillcontinuetobreaknew