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PROGRAMMABLELOGIC CONTROLLER(PLC) SOLUTIONSTheory and Typical Architecture forIndustrial PLC SystemsComprised of power supplies, CPUs, and multiple analog and digital I/Omodules, a PLC system controls, actuates, and monitors complex machinevariables. It is designed for multiple input and output arrangement,extended temperature ranges, immunity to electrical noise, and resistanceto vibration and impact.A PLC system comprises power supplies, control and communicationmodules, and a variety of analog input, analog output, digital input, anddigital output modules.Industrial PLC System Design Considerationsand Major ChallengesTo have an appropriate PLC system design, engineers must considermany different system requirements including accuracy, bandwidth,and input range.XXAnalog input types and ranges, which can be as small as 10 mVfor TC (thermocouple) and RTD and as large as 10 V for actuatorcontrollers, or 4 mA to 20 mA currents in process control systems.XXAnalog output types and ranges typically include 5 V, 10 V, 0 Vto 5 V, 0 V to 10 V, 4 mA to 20 mA, and 0 mA to 20 mA. Overrangecapability may be required.XXThe resolution and accuracy of the input/output modules, typicallyranging from 12 to 16 bits, with 0.1% accuracy over the industrialtemperature range.XXConnectivity to a different fieldbus.XXIsolation between the system power module and low powerelectronics, between the input and output, and between the I/O andcentral control unit. The isolation grade varies from 1 kV to 2.5 kV.Visit analog.comXXAnalog input/output and power supply input protection: fault conditionvoltage or current and EMC considerations including electrical surgeand fast pulse transients and ESD.XXPower efficiency, thermal management, and heat dissipation willbecome increasingly important issues for miniaturized devices as theyattempt to reduce board size.In addition, more channels or nodes need to be placed within the samespace, requiring dense systems. Therefore, the form factor has to bereduced to accommodate this. This means smaller housings wherepower and heat management become a challenge, requiring solutions inintelligent power management via integrated dynamic power control.Historically, the large number of high performance discrete componentsrequired to implement these I/O systems resulted in large and expensiveimplementations. Recently, advances in integration have allowed systemdesigners to migrate to smaller, lower power, lower cost solutions, withperformance approaching these larger systems. The challenge movingforward is to continue to drive the integration of these solutions, whileincreasing their performance and diagnostic capabilities.Total Solutions from ADIADI offers market tailored solutions to aid in the design process. Thesesolutions feature our industry-leading technologies and offer a range ofdesign options—from implementation of discrete components to fullyintegrated solutions, and everything in between.With system expertise in industrial applications and leading technologiesin amplifiers, data converters, signal processing, and power management,ADI offers best-in-class solutions for high resolution, low noise industrialPLC system designs.
ADI Programmable Logic Controller (PLC) SolutionsOptional Field Supply 24 V NormalBackplane Supply24 V NormalDC-to-DCLDOCurrent DataISODC-to-DCLDOSequencerSupervisorySupply V/IOutputDriverIntegrated SolutionIntegrated SolutionHARTModemTempSensorSingle Output BlockTemperature Input BlockDSPHARTModemOutputProtectionProcessor otectionREFLightPowerISOADCDataISOMCUIntegrated tectionDriverOutputProtectionComm BlockDriverIntegrated SolutionVoltage/Current Input BlockMultioutput Block40 mA to 20 mA 40 mA to 20 mA 40 mA to 20 mA 40 mA to 20 mA0 V to 10 V0 V to 10 V0 V to 10 V0 V to 10 VMCUOptional Field Supply 24 V Normal40 mA to 20 mA 40 mA to 20 mA0 V to 10 V0 V to 10 V2Note: the signal chains above are representative of a PLC application system. The technical requirements of the blocks vary, but the products listedin the table are representative of ADI’s solutions that meet some of those requirements.Analog Input alog Output DevicesIsolatorsOther D5668/AD5628/AD5629R/AD5761/AD5721Light ower 2/AD5749/AD5748/AD5750Heavy acesADM2587E/ADM2482E/ADM2490E/ 1
Visit analog.comMain Product IntroductionFunction BlockPart NumberADCsDescriptionFeatures16-/24-bit, 4 SPS to 500 SPS, Low power (300 μA to 450 μA), internal PGA, ref, clock,Σ-Δ ADCbuffer, simultaneous 50 Hz/60 Hz rejectionThree power modes; low power: 24 nV rms at 1.17 SPS,gain 128 (255 μA typical); output data rate: full power:24-bit, multichannel, lowAD71249.38 SPS to 19,200 SPS; programmable gain (1 to 128);power, low noise, Σ-Δ ADCTC/RTDband gap reference with 15 ppm/ C drift maximumInput Devices(65 μA)Integrated SolutionIntegrated dual/single 24-bit Σ-Δ ADC; UART, I2C andADuCM360/ARM Cortex -M32 SPI serial I/O; 16-bit PWM controller; 19-leadADuCM361microcontrollermultifunction GPIO ports; 128 kB flash/EE memory,8 kB SRAMADCsRMS noise: 11 nV at 4.7 Hz (gain 128), up to 22 noiseMultichannel, 4.8 kHz,AD719xfree bits (gain 1), programmable gain (1 to 128) outputultralow noise, 24-bit Σ-Δ ADCdata rate: 4.7 Hz to 4.8 kHz; AD714 with integrated PGAAD7606/4-channel/6-channel/Bipolar input ranges with single 5 V power supply,AD7606-4/8-channel, 10 Vserial and parallel interface; 90 dB SNRAD7606-6simultaneous samplingFast and flexible output rate: 1.25 SPS to 31.25 kSPSFast settling, highly accurate,channel scan data rate (161 μs settling); performanceAD7173-8low power, 8-channel/specifications: 17.5 noise free bits at 31.25 kSPS;16-channel, multiplexed ADC23 noise free bits at 1.25 SPS; INL: 3 ppm/FSRHigh input common-mode rejection: 100 dB; on-chip8-channel, 16-bit, 1 MSPSADAS30224.096 V reference and buffer; differential input voltageSAR ADCrange: 24.576 V maximumINL: 0.4 LSB typical, 1.5 LSB maximum; dynamic8-channel, 16-bit, SAR ADC,range: 93.8 dB; SINAD: 92.5 dB at 20 kHz; THD: 100 dBAD7689single power supplyat 20 kHz; single-supply 2.3 V to 5.5 V operation with1.8 V to 5.5 V logic interface32-bit data output; fast and flexible output rate: 5 SPS to32-bit, 10 kSPS, Σ-Δ ADC10 kSPS; performance specifications: 19.1 noise free bitsAD7177-2with 100 µs settling and true@ 10 kSPS; 24.6 noise free bits @ 5 SPS; 85 dB filterrail-to-rail buffersrejection of 50 Hz and 60 Hz with 50 ms settling4 mA to 20 mA/Amplifiers0 V to 10 V330 μA maximum quiescent current; 8 nV/ Hz maximumInput Devicesinput voltage noise at 1 kHz; excellent ac specifications:80 dB minimum CMRR @ 10 kHzRail-to-rail(G 1); high precision dc performance 150 dB minimumAD8422instrumentation amplifierCMRR (G 1000); wide supply range: 4.6 V to 36 Vsingle-supply, 2.3 V to 18 V dual supply; gain range:1 to 1000Low power: 60 μA per amplifier typical; unity-gainADA4096-2/Dual/quad micropowerbandwidth 800 kHz typ @ VSY 15 V; 550 kHz typADA4096-4operation and rail-to-rail input@ VSY 5 V; 465 kHz typ @ VSY 1.5 V; low offsetwith OVPand output rangesvoltage: 300 μV maximumMuxes4 kV human body model (HBM) ESD rating; low onFour independent single-pole/ resistance (10 Ω); 5 V to 25 V dual-supply operation;ADG5412Fsingle-throw (SPST) switches 5 V to 44 V; single-supply operation; fully specified @ 15 V, 20 V, 5 V, 12 V, and 36 VADG5208F and ADG5209FADG5208F/Overvoltage protection up to 55 V and 55 V; low onare 8:1 and dual 4:1 analogADG5209Fcapacitance: ADG5208F: 20 pF; ADG5209F: 14 pFmultiplexersADG508F comprisingLow on resistance (270 Ω typical); fast switching times:ADG508F/eight single channels/TON 230 ns maximum; TOFF 130 ns maximum; low powerADG509FADG509F comprising fourdissipation (3.3 mW maximum)differential channelsAD779xBenefitVery low power dissipation 450 μA maxHigh integration, diagnostic functionsADuCM360/ADuCM361 is designedfor direct interfacing to externalprecision sensors in both wired andbattery-powered applications2 differential/4 pseudo differential,8 differential/16 pseudo differentialinput channels 10 V full input range, 1 mΩ impedance,synchronous sampling30 kSPS data rate; high free noiseresolution; 4 GPIO 500 MΩ input impedanceThroughput 250 kSPS32-bit, low noise, multichannelHigh precision, low power, low noiseInput overvoltage protection, 32 V aboveand below the supply rails; unity-gainstableWith overvoltage protection and power-offprotectionOvervoltage protectionOvervoltage protection; TTL andCMOS-compatible inputs3
4ADI Programmable Logic Controller (PLC) SolutionsFunction BlockPart Number DescriptionPower IsolatorsADuM50002.5 kV, Isolateddc-to-dc converterADM2587E/ADM2582ESignal and power isolatedRS-485 transceiver with 15 kV ESD protectionADuM521xDual-channel digital isolatorswith isoPower integrated,isolated powerADuM347xPWM controller andtransformer driver withquad-channel isolatorsIsolatorsFeaturesisoPower integrated, isolated dc-to-dc converter;regulated 3.3 V or 5 V output; up to 500 mW outputpower; safety and regulatory approvalsIsolated RS-485/RS-422 transceiver, configurable ashalf- or full-duplex; isoPower integrated isolateddc-to-dc converter; complies with ANSI/TIA/EIA485-A-98 and ISO 8482:1987; ADM2582E data rate:16 Mbps; ADM2587E data rate: 500 kbps;high common-mode transient immunity: 25 kV/μsIntegrated isolated dc-to-dc converter; regulated 5 V/30 mA output; dual dc to 100 Mbps (NRZ) signalisolation channels; precise timing characteristics: 2 nsmaximum pulse width distortion; high common-modetransient immunity: 25 kV/μsIsolated PWM controller; integrated transformer driver;regulated adjustable output: 3.3 V to 24 V; 2 W outputpower; 70% efficiency; quad dc-to-25 Mbps signalisolation channels; soft start function at power-up;thermal shutdown, 2.5 kV rms isolationBenefitIsolated; high output powerIntegrated signal and power isolateddata transceiverSmall package; integrated power isolationHigh output power; adjustable oscillatorfrequency; high temperature operationData er n ADM305xInterfacesADM325xEQuad-channel digital Isolator,3.75 kV rms1.8 V/3.3 V level translation, high temperatureoperation: 125 C, high data rate: dc to 10 Mbps (NRZ)Up to 100 Mbps data rate (NRZ); low propagationDigital isolator, 3 kV rmsdelay: 20 ns typical; 2.7 V to 5 V level translation; highcommon-mode transient immunity: 25 kV/μsQuad-channel digital Isolator, 1.8 V to 5 V level translation, high temperature3.75 kV rmsoperation: 125 C, high data rate: dc to 25 Mbps (NRZ)Wide input voltage range of 4.5 V to 36 V, maximumSynchronous step-download current of 1 A, adjustable output down to 0.6 V,dc-to-dc regulator 1% output voltage accuracyWide input voltage range from 4.5 V to 36 V; high36 V, 1 A, synchronous, stepefficiency of up to 94%; 1% output voltage accuracydown, dc-to-dc regulator withadjustable switching frequency from 300 kHz to 1 MHzexternal clock synchronizationexternal synchronization from 300 kHz to 1 MHzWide input voltage range: 2.85 V to 15 V; adjustablenegative output to VIN 39 V; integrated 1.2 A main1.2 A, dc-to-dcswitch; 1.2 MHz/2.4 MHz switching frequency withinverting regulatoroptional external frequency synchronization from1.0 MHz to 2.6 MHzWide input range from 2.85 V to 15 V; programmableoutput support 15 V output ( 15 V/100 mA from 3.3 VSwitching regulatorinput; 15 V/65 mA from 3.3 V input); 40 C to 125 Coperation rangeIsolated RS-485/RS-422Full-/half-duplex, 5 V/3.3 V operation, 16 Mbps, 8 kV ESD5 V operation on VCC; complies with ISO 11898standard; high speed data rates up to 1 Mbps;CAN transceivershort-circuit protection on CANH and CANL againstshorts to power/ground in 24 V systemsIsolated RS-232 driver/receiver 5 V/3.3 V supply, 460 kbps, 2.5 kV isolationBidirectional communication,low power operationLow dynamic power consumption; lowpropagation delay: 20 ns (typical)Bidirectional communication,low power operationPulse skip mode at light load for powersaving, adjustable switching frequency of300 kHz to 1 MHzWide input voltage, high efficiency,small packageInverting regulator, small packageIndependent positive andnegative outputHigh speed, multipoint transmission lineThermal shutdown protection;low current standby modeIsolated single-channelwith high ESD protectionDACsAD5761/AD5721Multiple range, 16-/12-bit,bipolar/unipolar, voltageoutput DACsLow power, single-channel,16-bit buffered voltageout DACsVoltage Current DriverAD5683RSingle AnalogOutput DevicesAD5750-2Single-channel current/voltage output driverIntegrated SolutionsAD5422/AD5412/Single-channel, 16-/12-bit,AD5420/current/voltage output DACAD5410Eight software-programmable output ranges: 0 V to 5 V,0 V to 10 V, 0 V to 16 V, 0 V to 20 V, 3 V, 5 V, 10 V, 2.5 V to 7.5 V; 5% overrange; total unadjusted error Bipolar/unipolar; low noise(TUE): 0.1% FSR maximum; guaranteed monotonicity: 1 LSB maximumHigh relative accuracy (INL): 2 LSB maximum atHigh drive capability: 20 mA; low power:16 bits; low drift, 2.5 V reference: 2 ppm/ C typical;1.2 mW at 3.3 V; robust 4 kV ESD protectionselectable span output: 2.5 V or 5 VCurrent output range: 0 mA to 24 mA, 4 mA to 20mA;0 V to 5 V, 0 V to 10 V, 5 V, and 10 V with 20%overrange; flexible serial interface, on-chip outputfault detectionLow cost, precision voltage/currentoutput drivers with hardware- orsoftware-programmableIOUT ranges: 0 mA/4 mA to 20 mA, 0 mA to 24 mA, VOUTranges: 0 V to 5 V, 0 V to 10 V, 5 V, 10 V, and 10%overrange, 0.01 % FSR TUE, 3 ppm/ C output drift;on-chip output fault detection; on-chip VREFEasy to deploy solution, integrated featuresin a compact package, AD5422/AD5412simplifies factory process control andindustrial system design
Visit analog.comFunction BlockPart Quad, 16-/12-bit nanoDAC with on-chip reference andSPI inerfaceHigh relative accuracy (INL): 2 LSB, low drift 2.5 Vreference 2 ppm/ C, total unadjusted error (TUE):0.1% of FSR maximum, offset error: 1.5 mV maximum,gain error: 0.1% of FSR maximum, high drive capability:20 mA, 0.5 V from supply railsRail-to-rail, voltage output DAC; thedevice includes a 2.5 V, 2 ppm/ C internalreference (enabled by default) and a gainselect pin giving a full-scale output of 2.5 V(gain 1) or 5 V (gain 2)Multiple AnalogOutput Devices Integrated 700-1Reference Circuit 0CN-0321CN-0233CN-0267RD ADuC7061Dynamic power control for thermal management,voltage or current output on the same pin, IOUTrange: 0 mA/4 mA to 20 mA, or 0 mA to 24 mA,VOUT range: 0 V to 5 V, 0 V to 10 V, 5 V, 10 V, 6 V, 12 V; on-chip referenceHART-compliant fully integrated FSK modem, 1200 Hzand 2200 Hz sinusoidal shift frequencies, 115 µAHalf-duplex HART modem/maximum supply current in receive mode, integratedhalf-duplex HART modem withreceive band-pass filter, minimal external componentsinternal oscillatorrequired, 1.71 V to 5.5 V power supply/0.5% precisioninternal oscillatorQuad-channel, 16-/12-bit,current/voltage output DACwith dynamic power controlIndustry’s first data converter with dynamicpower control functionality that providesenergy savings and enhances the reliabilityof process control I/O system operationLowest power consumption;smallest package; high integration;high driver capabilityDescriptionIsolated, 4-channel, thermocouple/RTD temperature measurement system with 0.5 C accuracy24-bit, 250 kSPS single-supply data acquisition system24-bit, 4.7 Hz, 4-channel, analog data acquisition system16-bit, 100 kSPS, single-supply, low power data acquisition system16-bit, 250 kSPS, 8-channel, single-supply, isolated data acquisition systemPLC/DCS universal analog input using either 4-pin or 6-pin terminal blockComplete 4 mA to 20 mA HART solutionFully isolated, single-channel voltage and 4 mA to 20 mA output with HART16-bit, isolated, industrial voltage and current output DAC with isolated dc-to-dc suppliesComplete 4 mA to 20 mA looped power field instrument with HART interfaceLow power 4-wire pressure transmitter5
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2 ADI Programmable Logic Controller (PLC) Solutions Note: the signal chains above are representative of a PLC application system. The technical requirements of the blocks vary, but the products listed in the table are representative of ADI’s solutions that meet some of those requiremen
