ontroller(PLC),PLCscanperformtimingfunctions(fortheequivalentoftime-delayrelays),drumsequencing,-BradleyPLC().Witheachmodulehavingsixteen"points"ofeitherinputoroutput,thisPLChastheabilitytomonitorandcontroldozensofdevices.,aPLCtakesuplittleroom,especiallyconsideringtheequivalentspacethatwouldbeneededbyelectromechanicalrelaystoperformthesamefunctions().-puter,()puterdisplayingagraphicimageofarealliquid-levelprocess(apumpingstationforamunicipalwastewatertreatmentsystem)-buttons,limitswitches,,relaycoils,-,theswitchedconditionsoftheinputsareconvertedtologic--leveloutputsfromthecontrolunitareconvertedtothevoltagelevelsrequiredtoenergizeorde-,(OBs),programblocks(PBs),functionblocks(FBs),sequenceblocks(SBs)anddatablocks(DBs).
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