Precision DAC and Watchdog Improve Analog Output Safety

Abstract:UsingaDACandamicroprocessorsupervisor,thesystemsafetycanbeimprovedinindustrialcontrollers,programmable-logiccontrollers(PLC),anddata-acquisitionsystems.Theanalogoutputissettozero-scale(orpin-programmablemidscale)whenamicroprocessorfailure,optocouplerfailure,orundervoltageconditionoccurs.Asimpleapplicationisshownonhowtoimplementthisfunction.Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>A/DandD/AConversion/SamplingCircuits>APP474Keywords:uPsupervisor,microprocessorsupervisor,analogio,DAC,optocoupler,digitalanalogconverter,programmablelogiccontroller,PLC,dataacquisitionFeb15,2012APPLICATIONNOTE474PrecisionDACandWatchdogImproveAnalogOutputSafetyBy:DamianAnzaldo,CommunicationSegmentManager,MaximIntegratedProductsFeb15,2012Abstract:UsingaDACandamicroprocessorsupervisor,thesystemsafetycanbeimprovedinindustrialcontrollers,programmable-logiccontrollers(PLC),anddata-acquisitionsystems.Theanalogoutputissettozero-sc