tbeused,forexampleonewhichallowedthefunctionofthecontrollertobedescribedintermsofrelayinterconnections,IneithercaseprogramscanbestoredinRAM,whichallowsthemtobealteredtosuitchangesinapplication,butthismakestheoverallsystemvulnerabletolosslfpowerunlessbatteriesareusedtoensurecontinuityofsupply.AlternativelyprogramscanbestoredinROM,epartoftheelectronic‘hardware’andareoftenreferredtoasfirmware.putersfortheirimplementation,althoughtheuselflargescaleintegratedcircuits‘puters,Productsandprocesscontrollersofvariouskindsrepresentthemajorityofpresent-puterapplications,theexactfiguresdependingonone’sinterpretationoftheword‘product’.puterscanbeassignedtooneorotherofthesecategories.ButinthesystemwemoststudyPressureandPressureTransmitters.Pressureariseswhenaforceisappliedoveranarea.Providedtheforceisone
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