F2-4AD2DA 4-Ch.In/2-Ch.Out 14 CombinationAnalog InThis Chapter.... — Module Specifications — Connecting the Field Wiring — Module Operation — Writing the Control Program 14--2 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Module Specifications The F2-4AD2DA Analog Input/Output IN/ ANALOG module provides several hardware OUT features: S On-board 250 ohm, 1/2 watt precision resistors provide F2-4AD2DA substantial over-current-protection for 4--20mA current loops. 18 26.4 VDC 80 mA ANALOG S Analog inputs and outputs are 4IN/ 2OUT 4--20mA 0V optically isolated from the PLC +24V logic. IN-- S The module has a removable CH1+ IN terminal block so the module can CH2+ be easily removed or changed CH3+ CH4+ without disconnecting the wiring. OUT-- S With a DL240/250--1/260 CPU, you OUT CH1+ can update all input and output CH2+ channels in one scan. F2--4AD2DA S On-board active analog filtering and RISC-like microcontroller provide digital signal processing to maintain precision analog measurements in noisy environments. S Low-power CMOS design requires less than 80mA from an external 18--26.4 VDC power supply. The following tables provide the specifications for the F2-4AD2DA Analog Input/OutputModule.Reviewthesespecificationsto makesurethe modulemeets your application requirements. Input NumberofInputChannels 4,singleended(onecommon) Specifications Range 4to20mAcurrent Resolution 12bit(1in4096) InputImpedance 250Ω,0.1%,½W,25ppm/_C currentinputresistance MaximumContinuous Overload --40to+40mA,eachcurrentinput InputStability 1count Crosstalk --70dB,1countmaximum CommonModeRejection --50dBat800Hz ActiveLow-Pass Filter --3dBat50Hz,2poles (--12dBperoctave) StepResponse 10mSto95% FullScaleCalibrationError 12counts maximum,at20mAcurrentinput OffsetCalibrationError 8counts maximum,at4mAcurrentinput MaximumInputInaccuracy 0.3%@ 25C(77F) 0.45%@ 0to60C (32to140F) RecommendedExternalFuse 0.032A,series 217fast-acting,currentinputs DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--3 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Output N Nu um mb be erro offO Ou uttp pu uttC Ch ha anne nnellss 2 2,ssiin ng glle ee en nd de ed d((o one necco ommon mmon)) Specifications Range 4to20mAcurrent Resolution 12bit(1in4096) P Pe ea akk W Wiitth hsstta an nd diin ng gV Vo olltta age ge 7 75 5V VD DC C,ccu urrre ren ntto ou uttp pu uttss E Exxtte errna nallL Lo oa ad dR Re essiisstta anc nce e 0 0ΩΩm miin niim mum, um ccu urrrre en ntto ou uttp pu uttss LoopSupply VoltageRange 18--30VDC,currentoutputs M Ma axxiim mum umL Lo oa ad d//P Po ow wer erS Su upp ppllyy 9 91 10 0ΩΩ//2 24 4V V,6 62 20 0ΩΩ//1 18 8V V,1 12 20 00 0ΩΩ//3 30 0V V,ccu urre rren ntto ou uttp pu uttss L Liin near eariittyy E Errro rorr((b be essttffiitt)) 1 1cco oun untt((0 0.0 02 25 5% %o offffu ullllssca calle e))m max axiim mum um SettlingTime 100μs maximum(fullscalechange) MaximumInaccuracy 0.1%@ 25C(77F) 0.3%@ 0to60C (32to140F) FullScaleCalibrationError 5counts at20mAcurrentoutput OffsetCalibrationError 3counts at4mAcurrentoutput General Module Digit g alInput p andOutput p Points Requir q ed 16point p ((X))input p s 1 16 6point i ((Y Y))outputs Specifications P PL LC C U Up p pd da atte eR Ra atte e 4 4iin nput p putcch ha anne nnellss p p per ersscca an nm max axiim mum um(((D D2 2----2 24 40 0//2 25 50 0----1 1//2 26 60 0C CP PU U))) 2 2 2out outtput puttcchannels h hannells per persscca an nm max aximum iimum(((D D D2 2 2--240/ 2 24 40 0//250 2 25 50 0--1/ 1 1//260 2 26 60 0C C CP P PU U U))) 1i 1in np pu utta an nd d1 1o ou uttp pu uttcch ha ann nne ellp pe errsscca anm nma axi xim mu um m((D2 D2----2 23 30 0C CP PU U)) P Po ow wer erB Bu ud dg ge ettR Re equ quiirre em me en ntt 6 60 0m mA A@ @5 5V VD DC C ((ssu upp pplliie ed db byy b ba asse e)) ExternalPowerSupply Requirement 18to26.4VDC,80mAmaximumplus 20mAperloopoutput Accuracy vs.Temperature 45ppm/C fullscalecalibrationrange (includingmaximumoffsetchange) OperatingTemperature 0to60_C (32to140F) StorageTemperature --20to70_C (--4to158F) RelativeHumidity 5to95%(non-condensing) EnvironmentalAir Nocorrosivegases permitted Vibration MILSTD 810C 514.2 Shock MILSTD 810C 516.2 NoiseImmunity NEMAICS3--304 Onecountinthespecificationtableis equaltooneleastsignificantbitoftheanalogdatavalue(1in4096). Combination TheF2-4AD2DAAnalogmodulerequires16discreteinputand16discreteoutput Analog points.ThemodulecanbeinstalledinanyslotofaDL205system,exceptwhenyou Configuration use the DL230 programmingmethod. Theavailable powerbudget mayalso bea Requirements limitingfactor.ChecktheusermanualforyourparticularmodelofCPUandI/Obase formoreinformationregardingpowerbudgetandnumberoflocal,localexpanison or remote I/O points. DL205AnalogManual7thEd.Rev. B4/10 14--4 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Special Even though the module can be placed in any slot, it is important to examine the Placement configurationifyouareusingaDL230CPU.Asyoucanseeinthesectiononwriting Requirements theprogram,youuseV-memorylocationstoextract theanalog data.If youplace (DL230 and the module so that either the input or output points do not start on a V-memory boundary, the instructions cannot access the data. This also applies when the Remote I/O Bases) module is placed in remote I/O bases (D2--RSSS in CPU slot). F2-4AD2DA Correct! Slot0 Slot1 Slot2 Slot3 Slot4 16pt 8pt 8pt 8pt 16pt In / Out Output Input Input Output X0 X10 Y0 X20 Y20 Y40 -- -- -- -- -- -- X7 X17 Y17 X37 Y37 Y47 V40400 V40500 V40502 Output Data is correctly entered so input and output points start on a V-memory boundary. V40501 V40401 MSB LSB MSB LSB Y Y X X 3 2 3 2 7 0 7 0 Incorrect F2-4AD2DA Slot0 Slot1 Slot2 Slot3 Slot4 16pt 16pt 8pt 8pt 8pt In / Out Output Input Input Output X0 X10 Y0 X20 Y10 Y30 -- -- -- -- -- -- X7 X17 Y7 X37 Y27 Y47 V40400 V40500 V40401 V40500 V40501 V40501 V40502 Output Data is split over two locations, so instructions cannot write data from a DL230. V40501 V40500 MSB LSB MSB LSB Y Y Y Y Y Y Y Y 3 3 2 2 1 1 7 0 7 0 7 0 7 0 DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--5 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog To use the V-memory references required for a DL230 CPU, the first input and output addresses assigned to the module must be one of the following X and Y locations.ThetablealsoshowstheV-memoryaddressesthatcorrespondtothese locations. X X0 X20 X40 X60 X100 X120 X140 X160 V V40400 V40401 V40402 V40403 V40404 V40405 V40406 V40407 Y Y0 Y20 Y40 Y60 Y100 Y120 Y140 Y160 V V40500 V40501 V40502 V40503 V40504 V40505 V40506 V40507 Connectingthe FieldWiring WiringGuidelines Your company may have guidelines for wiring and cable installation. If so, you should check those before you begin the installation. Here are some ideas to consider: S Use the shortest wiring route whenever possible. S Use shielded wiring and ground the shield at the signal source. Do not ground the shield at both the module and the load or source. S Do not run the signal wiring next to large motors, high current switches, or transformers. This may cause noise problems. S Route the wiring through an approved cable housing to minimize the risk of accidental damage. Check local and national codes to choose the correct method for your application. User Power The F2-4AD2DA requires at least one field-side power supply. You may use the Supply same or separate power sources for the module supply and loop supply. The Requirements modulerequires18--26.4VDC,at80mA.Inaddition,eachcurrentlooprequires20 mA (a total of 120 mA for six current loops). If you want to use a separate power supply make sure that it meets these requirements. TheDL205baseshavebuilt-in24VDCpowersuppliesthatprovideupto300mAof current. You may use this instead of a separate supply if you are using only one combinationmodule.Thecurrentrequiredis80mA(module)plusupto120mA(six current loops) for a total of 200 mA. Itisdesirableinsomesituationstopowertheloopsseparatelyinalocationremote fromthePLC.Thiswillworkaslongastheloop’spowersupplymeetsthevoltage andcurrentrequirements,anditsminus(--)sideandthemodulesupply’sminus(--) side are connected together. WARNING: If you are using the 24 VDC base power supply, make sure you calculatethepowerbudget.Exceedingthepowerbudgetcancauseunpredictable systemoperationthatcanleadtoariskofpersonalinjuryordamagetoequipment. DL205AnalogManual7thEd.Rev. B4/10 14--6 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog TheDL205basehasaswitchingtypepowersupply.Asaresultofswitchingnoise, you may notice3--5 counts of instability in the analog input data if you use the base power supply. If this is unacceptable, you should try one of the following: 1. Use a separate linear power supply. 2. Connect the 24VDC common to the frame ground, which is the screw terminal marked “G” on the base. By using these methods, the input stability is rated at1 count. CurrentLoop Standard4to20mAtransmittersandtransducerscanoperatefromawidevariety Transmitter ofpowersupplies.Notalltransmittersarealikeandthemanufacturersoftenspecify Impedance a minimum loop or load resistance that must be used with the transmitter. The F2-4AD2DA provides 250 ohm resistance for each input channel. If your transmitter requires a load resistance below 250 ohms, you do not have to make any adjustments. However, if your transmitter requires a load resistance higher than 250 ohms, you need to add a resistor in series with the module. Consider the following example for a transmitter being operated from a 30 VDC supplywitharecommendedloadresistanceof750ohms.Sincethemodulehasa 250 ohm resistor, you need to add an additional resistor. Example: R=Tr−Mr R -- resistor to add R=750− 250 Tr -- Transmitter total resistance requirement Mr -- Module resistance (internal 250 ohms) R≥500 Two-wire Transmitter +-- Module Channel 1 DC Supply R IN1+ +30V 250ohms IN-- 0V In the example, add a 500 ohm resistor (R) in series with the module. DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out DC to DC Converter 14--7 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog WiringDiagram TheF2-04AD2DAmodulehas aremovable connectorto makewiring easier.Simply squeeze the top and bottom retaining clips and gently pull the connector from the module. Use the following diagram to connect the field wiring. The diagram shows separate module and loop power supplies. If you desire to use only one field-side supply,justcombinethesupplies’positive(+)terminalsintoonenode,andremovethe loop supply. Note1:Shields shouldbeconnectedattheirrespectivesignalsource. Note2:Unusedchannels shouldremainopen(noconnections)forminimumpowerconsumption. Note3:Morethanoneexternalpowersupply canbeusedprovidedallthepowersupply commons are connectedtogether. Note4:Aseries 217,0.032A,fast-actingfuseis recommendedfor4--20mAcurrentinputloops. Note5:Ifthepowersupply commonofanexternalpowersupply is notconnectedto0Vonthemodule,then theoutputoftheexternaltransmittermustbeisolated.Toavoid“groundloop”errors,recommended4--20mA transmittertypes are: a.For2or3wire:Isolationbetweeninputsignalandpowersupply. b.For4wire:Isolationbetweeninputsignal,powersupply,and4--20mAoutput. Note6:Ifananalogchannelis connectedbackwards,thenincorrectdatavalues willbereturnedforthat channel.Inputsignals inthe-4to+4mArangereturnazerovalue.Signals inthe-4to-40mArangereturna non-zerovalue. Note7:Toavoidsmallerrors duetoterminalblock losses,connect0V,IN-- andOUT-- ontheterminalblock as shown.Themodule’s internalconnectionofthesenodes is notsufficienttopermitmoduleperformanceupto theaccuracy specifications. Note8:Chooseaoutputtransducerresistanceaccordingtothemaximumload/powersupply listedinthe OutputSpecifications table. TypicalUser Wiring Module Supply 18-26.4VDC SeeNote1 Internal + -- Module IN/ ANALOG Wiring OUT -- + -- CH1 0VDC +5V 4--wire + 4--20mA +15V +24 VDC Transmitter 0V IN-- + F2-4AD2DA -- --15V CH2 3--wire IN1+ + 1826.4VDC 4--20mA 80mA Transmitter ANALOG IN2+ Fuse 4IN / 2OUT 250 ohms 4--20mA Ato D 0V IN3+ Fuse Converter 250 ohms -- CH3 +24V 2-wire IN4+ Fuse 250 ohms + IN-- 4--20mA Transmitter OUT-- CH1+ Fuse 250 ohms -- IN CH4 CH2+ 2-wire OUT1+ DtoA + 4--20mA CH3+ Converter Transmitter OUT2+ Ch 1 CH4+ Current sinking OUT-- OUT CH1+ Ch 1 load DtoA CH2+ 0--910 ohms Converter (@24V) Ch 2 Current sinking Ch 2 load F2--4AD2DA ohms 0--910 -- (@24V) 18--30VDC + SeeNote8 0V Supply SeeNote1 LoopSupply DL205AnalogManual7thEd.Rev. B4/10 14--8 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Module Operation Beforeyoubeginwritingthecontrolprogram,itisimportanttotakeafewminutesto understand how the module processes and represents the analog signals. InputChannel TheF2-4AD2DAmodulecansupplydifferentamountsofdataperscan,depending Scanning onthetypeofCPUyouareusing.TheDL230canobtainonechannelofinputdata Sequence for perCPUscan.Sincetherearefourchannels,itcantakeuptofourscanstogetdata a DL230 CPU forallchannels.Onceallchannelshavebeenscannedtheprocessstartsoverwith (Multiplexing) channel1.Unusedchannelsarenotprocessed,soifyouselectonlytwochannels, then each channel will be updated every other scan. Scan SystemWith DL230CPU ReadInputs ExecuteApplicationProgram Readthedata ScanN Channel 1 ScanN+1 Channel 2 ScanN+2 Channel 3 Storedata ScanN+3 Channel 4 ScanN+4 Channel 1 WritetoOutputs InputChannel IfyouareusingaDL240,DL250--1orDL260CPU,youcanobtainallfourchannels of input data in one scan. This is because the DL240/250--1/260 CPU supports Scanning special V-memory locations that are used to manage the data transfer. This is Sequence for a DL240, DL250--1 discussed in more detail in the section on Writing the Control Program. or DL260 CPU (Pointer Method) Scan SystemWith DL240/250--1/260 ReadInputs CPU ExecuteApplicationProgram Readthedata ScanN Ch1, 2, 3, 4 ScanN+1 Ch 1, 2, 3, 4 Ch1, 2, 3, 4 ScanN+2 Storedata Ch 1, 2, 3, 4 ScanN+3 Ch 1, 2, 3, 4 ScanN+4 WritetoOutputs DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--9 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog OutputChannel If you are using a DL230 CPU, you can send one channel of data to the output Update module on each scan. Since there are two channels, it can take two scans to Sequence for a update both channels. However, if you are only using one channel, then you can DL230 CPU update that channel on every scan. (Multiplexing) Scan SystemWith DL230CPU Readinputs Channel 1 ScanN ExecuteApplicationProgram Calculatethedata Channel 2 ScanN+1 Channel 1 ScanN+2 Writedata ScanN+3 Channel 2 Channel 1 ScanN+4 Writetooutputs OutputChannel IfyouareusingaDL240,DL250--1orDL260CPU,youcanupdatebothchannels on every scan. This is because the DL240/250--1/260 CPU supports special Update V-memorylocationsthatareusedtomanagethedatatransfer.Thisisdiscussedin Sequence for a more detail in the section on Writing the Control Program. DL240, DL250--1 or DL260 CPU (Pointer Method) SystemWith Scan DL240/250--1/260 CPU Readinputs Channel 1,2 ScanN ExecuteApplicationProgram Calculatethedata Channel 1,2 ScanN+1 Channel 1,2 ScanN+2 Channel 1,2 Writedata ScanN+3 Channel 1,2 ScanN+4 Writetooutputs DL205AnalogManual7thEd.Rev. B4/10 14--10 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Understanding You may recall the F2-4AD2DA module appears to the CPU as 16 discrete input the I/O and 16 discrete output points. These points provide the data value and channel Assignments identification.Note,ifyouareusingaDL240/250CPU,youmayneverhavetouse these bits, but it may help you understand the data format. SincealloutputpointsareautomaticallymappedintoV-memory,itisveryeasyto determine the location of the data words that will be assigned to the module. F2-4AD2DA Slot0 Slot1 Slot2 Slot3 Slot4 16pt 8pt 8pt 8pt 16pt In / Out Output Input Input Output X0 X10 Y0 X20 Y20 Y40 -- -- -- -- -- -- X7 X17 Y17 X37 Y37 Y47 V40400 V40500 V40502 V40501 V40401 MSB LSB MSB LSB Y Y Y X X X X X 3 3 2 3 3 3 3 2 NotUsed OutputDataBits InputDataBits 5 4 0 7 6 5 4 0 Withinthiswordlocation,theindividualbitsrepresentspecificinformationaboutthe analog signal. InputData Bits The first twelve bits of the input word represent the analog data in binary V40401 format. MSB LSB Bit Value Bit Value 1 1 1 1 1 1 9876 5432 1 0 01 6 64 5 4 3 2 1 0 1 2 7 128 2 4 8 256 = data bits 3 8 9 512 4 16 10 1024 5 32 11 2048 DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--11 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Active Channel Twooftheinputsarebinary encodedto V40401 Indicator Inputs indicate the active input channel. MSB LSB Remember, the V-memory bits are mapped directly to discrete inputs. The X X X module automatically turns on and off 3 3 2 these inputs to indicate the active input 5 4 0 channel for each scan. Scan X35 X34 Channel = channel inputs NOff Off 1 N+1 Off On 2 N+2 On Off 3 N+3 On On 4 N+4 Off Off 1 Diagnostic Thelasttwoinputs areused formodule V40401 Indicator Inputs diagnostics. MSB LSB Module Busy — The first diagnostic input (X36 in this example) indicates a X X X “busy” condition. This input will always 3 3 2 beactiveonthefirstPLCscantotellthe 7 6 0 CPU the analog data is not valid. After the first scan, the input usually only = diagnostic inputs comes on when environmental (electrical) noise problems are present. Note: When using the pointer The programming examples in the next method, the value placed into the section will show how you can use this V-memory location will be 8000 input. The wiring guidelines presented instead of the bit being set. earlier in this chapterprovide stepsthat can help reduce noise problems. ModuleFailure—Thelastdiagnosticinput(X37inthisexample)indicatesthatthe analogmoduleisnotoperating.Forexample,ifthe24VDCinputpowerismissing, or if the terminal block is loose, then the module will turn on this input point. The module will also return a data value of zero to further indicate there is aproblem. Thisinputpointcannotdetectwhichindividualchannelisatfault.Ifthecauseofthe failure goes away, the module turns this bit off. OutputData Bits The first twelve bits of the output word represent the analog data in binary V40501 format. MSB LSB Bit Value Bit Value 1 1 987 6543 21 0 01 6 64 1 0 1 2 7 128 2 4 8 256 = data bits 3 8 9 512 4 16 10 1024 5 32 11 2048 DL205AnalogManual7thEd.Rev. B4/10 14--12 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Output Two of the outputs select the active V40501 Channel channel.Remember,theV-memorybits MSB LSB SelectionBits aremappeddirectlytodiscreteoutputs. TurningabitOFFselectsitschannel.By Y Y Y controllingtheseoutputs,youcanselect 3 3 2 which channel(s) gets updated. 5 4 0 Y35 Y34 Channel On Off 1 = channel control outputs Off On 2 Off Off 1&2(same datato both channels) On On None (both channels hold current values) Module Since the module has 12-bit resolution, 4 -- 20mA Resolution theanalogsignalisconvertedinto4096 20mA 12 counts ranging from 0 -- 4095 (2 ). For example,a4mAsignalwouldbe0,anda 20mA signal would be 4095. This is 4mA equivalent to a binary value of 0000 0000 0000 to 1111 1111 1111, or 000 to 0 4095 FFF hexadecimal. The diagram shows H−L Resolution= how this relates to the signal range. 4095 H = high limit of the signal range Each count can also be expressed in terms of the signal level by using the L = low limit of the signal range equation shown. 16mA / 4095 = 3.907A per count DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--13 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Writingthe ControlProgram Beforeyoubeginwritingtheprogram,thereareafewsupplementalexamplesthat can be extremely beneficial. They include: S Input power failure detection S Output data calculation S Input data scaling Take a close look at these examples. They may be helpful for your application. AnalogInput The analog module has a microcontroller that can diagnose analog input circuit problems. You can easily create a simple ladder rung to detect these problems. Power Failure Thisrungshowsaninputpointthatwouldbeassignedifthemodulewasusedas Detection shown in the previous and following examples. Multiplexing method V-memory locationV2000holds V2000 K0 X37 channel1data.Whenadatavalue C1 ofzerois returnedandinputX37is OUT = on,thentheanalogchannelis not operatingproperly. Pointers method V-memory locationV2000holds V2000 K8000 channel1data.Whenadatavalue C1 of8000is returned,thentheanalog OUT = channelis notoperatingproperly. Calculatingthe Yourprogramhastocalculatethedigital 4095 A=U OutputData value to send to the analog output H−L channels. There are many ways to do this, but most applications are A = Analog value (0 -- 4095) understood more easily if you use U = Engineering units measurements in engineering units. H = high limit of the engineering This is accomplished by using the unit range conversion formula shown. L = low limit of the engineering You may have to make adjustments to unit range theformuladependingonthescaleyou choose for the engineering units. Consider the following example which controls pressure from 0.0 to 99.9 PSI. By usingtheformula,youcaneasilydeterminethedigitalvaluethatshouldbesentto themodule.Theexampleshowstheconversionrequiredtoyield49.4PSI.Notice the formula uses a multiplier of 10. This is because the decimal portion of 49.4 cannot be loaded, so you adjust the formula to compensate for it. 4095 A=10U 10(H−L) 4095 A=494 1000−0 A=2023 DL205AnalogManual7thEd.Rev. B4/10 14--14 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog The example program below shows how you would write the program to perform theengineeringunitconversion.ThisexamplewillworkwithallCPUsandassumes thatyouhavecalculatedorloadedtheengineeringunitvaluesandstoredthemin V2300andV2301forchannels1and2respectively.Also,wemovethefinalvalues to V2004 and V2005, which are memory locations that are used in the following examples.YoucanuseanyuserVlocations,buttheymustmatchthelocationsthat are specified as the source for the output data (see the next section for an example). NOTE: The DL205 offers instructions that allow you to perform math operations using BCD format. It is usually easier to perform any math calculations in BCD. SP1 TheLD instructionloads theengineeringunits usedwithchannel1into LD theaccumulator.This exampleassumes thenumbers areBCD.Since V2300 SP1is used,this rungautomatically executes onevery scan.Youcould alsouseanX,C,etc.permissivecontact. Multiply theaccumulatorby 4095(tostarttheconversion). MUL K4095 Dividetheaccumulatorby 1000(becauseweusedamultiplierof10, DIV wehavetouse1000insteadof100). K1000 StoretheBCD resultinV2004(theactualsteps requiredtosendthe OUT dataareshownlater). V2004 SP1 TheLD instructionloads theengineeringunits usedwithchannel2into LD theaccumulator.This exampleassumes thenumbers areBCD.Since V2301 SP1is used,this rungautomatically executes onevery scan.Youcould alsouseanX,C,etc.permissivecontact. Multiply theaccumulatorby 4095(tostarttheconversion). MUL K4095 Dividetheaccumulatorby 1000(becauseweusedamultiplierof10, DIV wehavetouse1000insteadof100). K1000 StoretheBCD resultinV2005(theactualsteps requiredtosendthe OUT dataareshownlater). V2005 DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--15 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Scalingthe Most applications usually require H−L Units=A measurements in engineering units, InputData 4095 which provide more meaningful data. H = High limit of the engineering This is accomplished by using the unit range conversion formula shown. L = Low limit of the engineering You may have to make adjustments to unit range theformuladependingonthescaleyou A = Analog value (0 -- 4095) choose for the engineering units. Forexample,ifyouwantedtomeasurepressure(PSI)from0.0to99.9,youwould havetomultiplytheanalogvalueby10inordertoimplyadecimalplacewhenyou viewthe valuewith theprogramming softwareor ahandheld programmer.Notice how the calculations differ when you use the multiplier. Analog Value of 2024, slightly less than half scale, should yield 49.4 PSI Example without multiplier Example with multiplier H−L H−L Units=A Units=10 A 4095 4095 100−0 100−0 Units=2024 Units=20240 4095 4095 Units=49 Units=494 Handheld Display Handheld Display V2001 V2000 V2001 V2000 0000 0049 0000 0494 This value is more accurate The example program below shows how you would write the program to perform the engineering unit conversion. This example assumes you have BCD data loadedintotheappropriateV-memorylocationsusinginstructionsthatapplyforthe model of CPU you are using. Note,this exampleuses SP1,whichis always on.You couldalsouseanX,C,etc.permissivecontact. SP1 Loadchannel1datatotheaccumulator. LD V2000 Multiply theaccumulatorby 1000(tostarttheconversion). MUL K1000 Dividetheaccumulatorby 4095. DIV K4095 StoretheresultinV2010. OUT V2010 DL205AnalogManual7thEd.Rev. B4/10 14--16 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Read/ Write The DL240, DL250--1 and DL260 CPUs have special V-memory locations Program assigned to each base slot that greatly simplify the programming requirements. (Pointer Method) These V-memory locations: S specify the number of input and output channels to scan.     230 240 250--1 260 S specify the storage location for the input data. S specify the source location for the output data. NOTE:Tousethepointermethod,DL250CPUsmusthavefirmwarerevision1.09 or later, and F2-AD2DA modules must be revision C1 or later. The example program shows how to setup these locations. Place this rung anywhere in the ladder program, or in the initial stage if you are using stage programming instructions. This is all that is required to read the input data into V-memorylocations.TheCPUautomaticallyconvertsthebinaryinputdatatoBCD format. Once the input data is in V-memory, you can perform math on the data, comparethedataagainstpresetvalues,andsoforth.Fortheoutputdata,youhave tocalculatethedigitalvalueinBCD(asshownpreviously)beforeyousendthedata to the module, unless you select the binary data format option shown below. V2000andV2004areusedasthebeginningofthedataareasintheexample,but you can use any user V-memory locations. Also, in the previous examples the module was installed in slot 3. You should use the V-memory locations for your application. The pointer method automatically converts values to BCD. SP0 LD LD -or - K K 0402 8482 Loads aconstantthatspecifies thenumberofchannels toscan andthedataformat.Theupperbyte,mostsignificantnibble (MSN)selects thedataformat(0=BCD,8=Binary),theLSN selects thenumberofinputchannels (1,2,3,or4).Thelower byte,mostsignificantnibble(MSN)selects thedataformat (0=BCD,8=Binary),theLSN selects thenumberofoutput channels (1,2). Thebinary formatis usedfordisplayingdataonsomeoperator interfaces.TheDL230/240CPUs donotsupportbinary math functions,whereas theDL250does. SpecialV-memory locationassignedtoslot3thatcontains the OUT numberofinputandoutputchannels. V7663 This constantdesignates thefirstV-memory locationthatwillbe LDA usedtostoretheinputdata.Forexample,theO2000enteredhere O2000 wouldmean: Ch1 -- V2000,Ch2 -- V2001,Ch3 -- V2002,Ch4 -- V2003 TheconstantO2000is storedhere.V7673is assignedtoslot3and OUT acts as apointer,whichmeans theCPU willusethevalueinthis V7673 locationtodetermineexactly wheretostoretheincomingdata. This constantdesignates thefirstV-memory locationthatwillbe LDA usedtoobtaintheanalogoutputdata.Forexample,theO2004 O2004 enteredherewouldmean:Ch1 -- V2004,Ch2 -- V2005. TheconstantO2004is storedhere.V7703is assignedtoslot3and OUT acts as apointer,whichmeans theCPU willusethevalueinthis V7703 locationtodetermineexactly wheretoobtaintheoutputdata. DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--17 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog The tables below show the special V-memory locations used by the DL240, DL250--1andDL260fortheCPUbaseandlocalexpansionbaseI/Oslots.Slot0 (zero) is the modulenext tothe CPUor D2--CMmodule. Slot1 isthe moduletwo placesfromtheCPUorD2--CM,andsoon.Remember,theCPUonlyexaminesthe pointervaluesattheselocationsafteramodetransition.Also,ifyouusetheDL230 (multiplexing) method, verify that these addresses in the CPU are zero. The Table below applies to the DL240, DL250--1 and DL260 CPU base. CPUBase: Analog In/Out ModuleSlot-Dependent V-memoryLocations Slot 0 1 2 3 4 5 6 7 No. of Channels V7660 V7661 V7662 V7663 V7664 V7665 V7666 V7667 Input Pointer V7670 V7671 V7672 V7673 V7674 V7675 V7676 V7677 Output Pointer V7700 V7701 V7702 V7703 V7704 V7705 V7706 V7707 The Table below applies to the DL250--1 or DL260 expansion base 1. Expansion BaseD2--CM #1: Analog In/Out ModuleSlot-Dependent V-memoryLocations Slot 0 1 2 3 4 5 6 7 No. of Channels V36000 V36001 V36002 V36003 V36004 V36005 V36006 V36007 Input Pointer V36010 V36011 V36012 V36013 V36014 V36015 V36016 V36017 Output Pointer V36020 V36021 V36022 V36023 V36024 V36025 V36026 V36027 The Table below applies to the DL250--1 or DL260 expansion base 2. Expansion BaseD2--CM #2: Analog In/Out ModuleSlot-Dependent V-memoryLocations Slot 0 1 2 3 4 5 6 7 No. of Channels V36100 V36101 V36102 V36103 V36104 V36105 V36106 V36107 Input Pointer V36110 V36111 V36112 V36113 V36114 V36115 V36116 V36117 Output Pointer V36120 V36121 V36122 V36123 V36124 V36125 V36126 V36127 The Table below applies to the DL260 CPU expansion base 3. Expansion BaseD2--CM #3: Analog In/Out ModuleSlot-Dependent V-memoryLocations Slot 0 1 2 3 4 5 6 7 No. of Channels V36200 V36201 V36202 V36203 V36204 V36205 V36206 V36207 Input Pointer V36210 V36211 V36212 V36213 V36214 V36215 V36216 V36217 Output Pointer V36220 V36221 V36222 V36223 V36224 V36225 V36226 V36227 The Table below applies to the DL260 CPU expansion base 4. Expansion BaseD2--CM #4: Analog In/Out ModuleSlot-Dependent V-memoryLocations Slot 0 1 2 3 4 5 6 7 No. of Channels V36300 V36301 V36302 V36303 V36304 V36305 V36306 V36307 Input Pointer V36310 V36311 V36312 V36313 V36314 V36315 V36316 V36317 Output Pointer V36320 V36321 V36322 V36323 V36324 V36325 V36326 V36327 DL205AnalogManual7thEd.Rev. B4/10 14--18 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog ReadingInput The DL230 CPU does not have the special V-memory locations that allow you to Values automatically enable the data transfer. Since all channels are multiplexed into a (Multiplexing) singledataword,thecontrolprogrammustbesetuptodeterminewhichchannelis beingread.SincethemoduleappearsasXinputpointstotheCPU,itisveryeasyto     usetheactivechannelstatusbitstodeterminewhichchannelisbeingmonitored. 230 240 250--1 260 Note,thisexampleisforamoduleinstalledasshowninthepreviousexamples.The addresses used would be different if the module was installed in another I/O arrangement. You can place these rungs anywhere in the program or if you are using stage programming, place them in a stage that is always active. Loaddatawhenmoduleisnotbusy. X36 Loads thecompletedatawordintotheaccumulator. LD TheV-memory locationdepends ontheI/O V40401 configuration.SeeAppendix Aforthememory map. This instructionmasks thechannelidentificationbits. ANDD Withoutthis,thevalues usedwillnotbecorrectsodo KFFF notforgettoincludeit. Itis usually easiertoperformmathoperations in BCD BCD,Youcanleaveoutthis instructionifyour applicationdoes notrequireit. StoreChannel1 X36 X34 X35 Whenthemoduleis notbusy andX36,X34andX35 OUT areoff,channel1datais storedinV2000. V2000 StoreChannel2 X36 X34 X35 Whenthemoduleis notbusy andX34is onandX35 OUT andX36areoff,channel2datais storedinV2001. V2001 StoreChannel3 X36 X34 X35 Whenthemoduleis notbusy andX34andX36are OUT offandX35is on,channel3datais storedinV2002. V2002 StoreChannel4 X36 X34 X35 Whenthemoduleis notbusy andbothX34andX35are OUT onandX36is off,channel4datais storedinV2003. V2003 DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--19 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog Single Input Sinceyoudonothavetodeterminewhichchannelisselected,thesinglechannel Channel program is even simpler. Selected Storechannel1whenmoduleisnotbusy. (Multiplexing) Loads thecompletedatawordintotheaccumulator. X36 X34 X35 LD TheV-memory locationdepends ontheI/O V40401 configuration.SeeAppendix Aforthememory map. This instructionmasks thechannelidentification ANDD bits.Withoutthis,thevalues usedwillnotbe KFFF correctsodonotforgettoincludeit. Itis usually easiertoperformmathoperations in BCD BCD.Youcanleaveoutthis instructionifyour applicationdoes notrequireit. OUT Whenthemoduleis notbusy andX34andX35are V2000 off,channel1datais storedinV2000. WritingOutput The DL230 CPU does not have the special V-memory locations that allow you to Values automatically enable the data transfer. Since all channels are multiplexed into a (Multiplexing) singledataword,thecontrolprogrammustbesetuptodeterminewhichchannelto write.SincethemoduleappearsasYoutputpointstotheCPU,itisveryeasytouse the channel selection outputs to determine which channel to update. Note,thisexampleisforamoduleinstalledasshowninthepreviousexamples.The addresses used would be different if the module was used in a different I/O arrangement. You can place these rungs anywhere in the program or if you are using stage programming, place them in a stage that is always active. Thisexampleisatwo-channelmultiplexerthatupdateseachchannelonalternate scans. SP7 is a special relay that is on for one scan, then off for one scan. NOTE: You must send binary data to the module. If the data is already in binary format, you should not use the BIN instruction shown in this example. Loaddataintotheaccumulator. SP7 Loads thedataforchannel1intotheaccumulator. LD V2000 SP7 Loads thedataforchannel2intotheaccumulator. LD V2001 SenddatatoV-memoryassignedtothemodule. SP1 Convertthedatatobinary (youmustomitthis stepif BIN youhaveconvertedthedataelsewhere). SP1is always on. TheOUTinstructionsends thedatatothemodule.Our OUT examplestarts withV40501,buttheactualvalue V40501 depends onthelocationofthemoduleinyour application. Selectthechanneltoupdate. SP7 Y34 Selects channel1forupdatewhenY34is OFF (Y35--ON deselects channel2).Note,Y34andY35are OUT usedduetotheprevious examples.Ifthemodulewas installedinadifferentI/O arrangement,theaddresses wouldbedifferent. SP7 Y35 Selects channel2forupdatewhenY35is OFF (Y34--ON deselects channel1).Note,Y34andY35are OUT usedduetotheprevious examples.Ifthemodulewas installedinadifferentI/O arrangement,addresses wouldbedifferent. DL205AnalogManual7thEd.Rev. B4/10 14--20 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog SendingData to Ifyouarenotusingbothchannels,orifyouwanttocontroltheupdatesseparately, One Channel use the following program. (Multiplexing) TheLD instructionloads thedataintothe SP1 accumulator.SinceSP1is used,this rung LD automatically executes onevery scan.Youcould V2000 alsouseanX,C,etc.permissivecontact. TheBIN instructionconverts theaccumulatordata BIN tobinary (youmustomitthis stepifyouhave already convertedthedataelsewhere). TheANDD instructionmasks offthechannelselect ANDD bits topreventanaccidentalchannelselection. K0FFF TheOUTinstructionsends thedatatothe module.Ourexamplestarts withV40501,butthe OUT actualvaluedepends onthelocationofthe V40501 moduleinyourapplication. Y34 Y34--OFFselects channel1forupdating. RST Y35 Y35--ON deselects channel2(donotupdate). OUT Sendingthe Same If both channel selection outputs are off, both channels will be updated with the Data toBoth same data. Channels TheLD instructionloads thedataintothe (Multiplexing) SP1 accumulator.SinceSP1is used,this rung LD automatically executes onevery scan.Youcould V2000 alsouseanX,C,etc.permissivecontact. TheBIN instructionconverts theaccumulatordata BIN tobinary (youmustomitthis stepifyouhave already convertedthedataelsewhere). TheANDD instructionmasks offthechannelselect ANDD bits topreventanaccidentalchannelselection. K0FFF TheOUTinstructionsends thedatatothe OUT module.Ourexamplestarts withV40501,butthe V40501 actualvaluedepends onthelocationofthe moduleinyourapplication. Y34 Y34--OFFselects channel1forupdating. RST Y35 RST Y35--OFFselects channel2forupdating. Analogand Sometimesitisusefultobeabletoquicklyconvertbetween thesignal levelsand Digital Value the digital values. This is especially helpful during machine startup or Conversions troubleshooting. The table provides formulas to make this conversion easier. Range If you know thedigital value... If you know theanalog signal level ... 4to20mA 16D 4095 A= +4D= (A−4) 4095 16 For example, if you have measured the 4095 D= (A−4) 16 signalat10mA,youcouldusetheformula to easily determine the digital value (D) 4095 D= (10mA−4) 16 that should be stored in the V-memory location that contains the data. D=(255.93) (6) D=1536 DL205 Analog Manual 7th Ed. Rev. B 4/10 F2-4AD2DA 4-Ch. In / 2-Ch. Out F2-4AD2DA 4-Ch. In / 2-Ch. Out 14--21 F2-4AD2DA 4-Ch. In / 2-Ch. Out Combination Analog FilteringInput AddthefollowinglogictofilterandsmoothanaloginputnoiseinDL250--1orDL260 Noise (DL250--1, CPUs.ThisisespeciallyusefulwhenusingPIDloops.Noisecanbegeneratedby DL260 CPUs Only) the field device and/or induced by field wiring.     TheanalogvalueinBCDisfirstconvertedtoabinarynumberbecausethereisnota 230 240 250--1 260 BCD-to-real conversion instruction. Memory location V1400 is the designated workspaceinthisexample.TheMULRinstructionisthefilterfactor,whichcanbe from0.1to0.9.Theexampleuses0.2.Asmallerfilterfactorincreasesfiltering.You canuseahigherprecisionvalue,butitisnotgenerallyneeded.Thefilteredvalueis then converted back to binary and then to BCD. The filtered value is stored in location V1402 for use in your application or PID loop. NOTE:Becarefulnottodoamultiplenumberconversiononavalue.Forexample, ifyouareusingthepointermethodtogettheanalogvalue,itisinBCDandmustbe convertedtobinary.However,ifyouareusingtheconventionalmethodofreading analog and are masking the first twelve bits, then it is already in binary and no conversion using the BIN instruction is needed. SP1 Loads theanalogsignal,whichis aBCD value LD andhas beenloadedfromV-memory location V2000 V2000,intotheaccumulator.ContactSP1is always on. Converts theBCD valueintheaccumulatorto BIN binary.Remember,this instructionis not needediftheanalogvalueis originally broughtinas abinary number. Converts thebinary valueintheaccumulator BTOR toarealnumber. Subtracts therealnumberstoredinlocation V1400fromtherealnumberintheaccumulator, SUBR V1400 andstores theresultintheaccumulator.V1400 is thedesignatedworkspaceinthis example. Multiplies therealnumberinthe MULR accumulatorby 0.2(thefilterfactor), R0.2 andstores theresultinthe accumulator.This is thefilteredvalue. Adds therealnumberstoredin ADDR locationV1400totherealnumber V1400 filteredvalueintheaccumulator,and stores theresultintheaccumulator. Copies thevalueintheaccumulatorto OUTD locationV1400. V1400 Converts therealnumberinthe accumulatortoabinary value,and RTOB stores theresultintheaccumulator. Converts thebinary valueintheaccumulator BCD toaBCD number.Note:TheBCD instruction is notneededforPID loopPV(loopPVis a binary number). Loads theBCD numberfilteredvaluefrom OUT theaccumulatorintolocationV1402tousein V1402 yourapplicationorPID loop. DL205AnalogManual7thEd.Rev. B4/10