5 F4-08AD 8-Channel Analog Input
Contents
1. 10V to 10V A 2n 10 D Oe A 10 5V to 5V A 10D 5 D 4022 A 5 0 to 5V A 22 p 4095 a 0 to 10V a 100 D 4095 a 1 to 5V 4D 4 D 40 a 1 4 to 20mA A 180 4 D 4053 A 4 For example if you are using the 10V to 10V range and you have measured the D 4095 A 10 signal at 6V you would use the following formula to determine the digital value 4095 that should be stored in the V memory D 5g V 10 location that contains the data D 204 75 16 D 3276 ar gt Q oD 2 oO S lt D fa G oO 2 Q oe2. 08AD module use the following examples to get started writing the control program Multiple Since all channels are multiplexed into a single data word the control program must Channels be set up to determine which channel is being read Since the module appears as X Selected input points to the CPU it is very easy to use the active channel status bits to determine which channel is being monitored F4 08AD 0 O rara inet incor E EE i npu npu nput Inpui utpu utpu XO X10 x20 x40 1 x7 x17 x37 x57 a o V40400 V40402 V40401 MSB LSB Unusable Active Data Bits Bit Channel Bits SN 3 fe D gt v fe eo G F4 08AD 8 Channel Analog Input Reading Values The following program example shows how to read the analog data into V memory DL430 CPU locations with the DL430 CPU Since the DL430 does not support the LDF Vi viv instruction you can use the LD instruction instead as shown The example also 430 440 450 works for DL440 and DL450 CPUs This example will read one channel per scan so it will take eight scans to read all eight channels Contact SP1 is used in the example because the inputs are continually being updated SP1 Loads the complete channel data word from the module into the Te accumulator The V memory locatio
3. 1024 J data bits 5 32 11 2048 Since the module has 12 bit resolution the analog signal is converted into 4096 counts ranging from 0 4095 212 For example with a 0 to 10V scale a OV signal would be 0 and a 10V signal would be 4095 This is equivalent to a a binary value of 0000 0000 0000 to 1111 1111 1111 or 000 to FFF hexadecimal The following diagram shows how this relates to each signal range 10V to 10V 5V to 5V OV 10V 0 4095 Each count can also be expressed in terms of the signal level by using the equation shown The following table shows the smallest signal levels that will result in a change in the data value for each signal range 1V 5V 4 20mA 5V ZT 20m 7T Ra wa 1V 4mA Lo Lo 0 4095 0 4095 n H L Resolution 4095 H high limit of the signal range L low limit of the signal range 20 V 10V 4095 4 88 mV 5V 10 V 4095 2 44 mV 0 to 5V 5V 4095 1 22 mV 0 to 10V 10 V 4095 2 44 mV 1 to 5V 4V 4095 0 98 mV 4 to 20mA 16 mA 4095 3 91 uA When using some instructions the most V40401 significant bit MSB is read along with MSB LSB the three active channel bits and is not L available for other uses 1111119876543210 543210 Nan F unusable bit Active Channel Bits F4 08AD 8 Channel Analog Input 5 13 Writing the Control Program If you have configured the F4
4. a current input or Voltage remove the jumper if using a voltage input Selecting Input The following table shows the jumper selections for the various ranges and are Signal and grouped by bipolar and unipolar The top portion of the table shows signal range Ranges settings for when the polarity jumper is installed in the Bi bipolar position and the lower portion of the table shows settings for when the polarity jumper is installed in the Uni unipolar position These settings will apply to all active channels 2 VDC to 2 VDC Signal Range Polarity 8mA to 8 mA salei 5 a a a a a a 2 5 VDC to 2 5 VDC Signal Range Polarity 10mA to 10 mA BL Unt a a a a a a a a a a a a 5 VDC to 5 VDC Signal Range Polarity 20mA to 20 mA an a a a a a a a a a a a a 10 VDC to 10 VDC Signal Range Polarity Bi _ Uni a a a a a a a a a a a a 4 to 20mA Signal Range Polarity Bi U 1 VDC to 5 VDC Sa a a a a a a a a a a a a 0 to 5 VDC Signal Range Polarity Go Bi Uni 0 to 20 mA Q E ele a nja D E E E E e Oo gt 0 to 10 VDC Signal Range Polarity D Bi Uni O a a a a a a a a a a a a a S 8 6 F4 08AD 8 Channel Analog Input Connecting the Field Wiring E 2 D 2 Cc lt T fan o
5. then the channel 7 data is stored in location V3006 V3000 6 See the following table Module Reading Acc Bits Offset Data Stored in Channel 1 000 Channel 2 001 Channel 3 010 Note this example Channel 4 011 uses SP1 which is always on You could Channel 5 100 also use an X C etc Channel 6 101 permissive contact Channel 7 110 V3000 V3001 V3002 V3003 V3004 V3005 V3006 V3007 NO BR WDM O Channel 8 111 E 2 D 2 Cc lt po fa Z pos 9 oe F4 08AD 8 Channel Analog Input Single Channel Selected Vivi v 430 440 450 Reading Values DL440 450 X vi Vv 430 440 450 Since you do not have to determine which channel is selected the single channel program is even more simple SP1 LD or LDF When X34 is on channel 1 data is being sent to the CPU Use the LD instruction when using a DL430 CPU BCD The BCD instruction converts the data from binary to BCD You can leave out this instruction if your application does not require it OUT V3000 The OUT instruction stores the data in V3000 Note This example uses SP1 which is always on You could also use an X C etc permissive contact Remember before the BCD instruction is executed the DL430 requires an additional instruction to mask out the first four bits that are brought in with the L
6. use an X C etc permissive contact H8 P1 LDF X20 K12 BCD LDF X34 K4 OUTX V3000 x1 V3000 MUL K1000 DIV K4095 OUT V3100 Loads the first 12 bits of the channel data word into the accumulator The X address depends on the I O configuration Since we are going to perform some math operations in BCD this instruction converts the data format This LDF instruction loads the three channel indicator bits plus the MSB into the accumulator The channel data from the first LDF instruction is pushed into the stack X34 X20 14 The OUTX instruction stores the channel data to an address that starts at V3000 plus the channel offset For example if channel two was being read the data would be stored in V3001 When X1 is on channel 1 data is loaded into the accumulator Multiplies the accumulator data by 1000 to start the conversion Divides the accumulator data by 4095 Stores the result in location V3100 2 2 gt o D gt gt v e gt m F4 08AD 8 Channel Analog Input Analog and Sometimes it is helpful to be able to quickly convert between the signal levels and Digital Value the digital values This is especially useful during machine startup or Conversions troubleshooting The following table provides formulas to make this conversion easier
7. 75 mA power from base External Power Supply 18 30 VDC 120 mA class 2 Recommended Fuse 0 032 A Series 217 fast acting current inputs Accuracy vs Temperature 50 ppm C maximum full scale including maximum offset change of 2 counts Operating Temperature 0 to 60 C 32 to 140 F Storage Temperature 20 to 70 C 4 F to 158 F o Relative Humidity 5 to 95 non condensing D Environmental Air No corrosive gases permitted 5 Vibration MIL STD 810C 514 2 gt Shock MIL STD 810C 516 2 gt Noise Immunity NEMA ICS3 304 ne Cc One count in the specification table is equal to one least significant bit of the analog data 1 in 4096 5 4 F4 08AD 8 Channel Analog Input Setting the Module Jumpers Jumper Locations aa Jumper Locations Selecting the Number of Channels a 2 D o S lt po Z f pos Q If you examine the rear of the module you will notice four banks of jumpers The module has several options that you can select by installing or removing these jumpers e A bank of eight jumpers to set voltage or current input for each channel e A bank of four jumpers to select the signal range for all active channels e A bank of three jumpers to select the number of channels used e A bank of two jumpers to select unipolar or bipolar signal range for all active channels The module is set at the factory for a 4 20 m
8. A signal range on all eight channels with unipolar polarity The following diagram shows how the jumpers are set at the factory and describes the function of each jumper When removing a jumper store it by placing it on a single pin to prevent losing it Voltage or Current Selection Signal Range For Each Channel Selection 1 2 3 4 5 6 7 8 B B B B B B B B B B B a B B B a a B B a a a a a 44 2 H Jumper on Current BI UNI off Voltage B B B B B a a a a a Number of Polarit Channels y The jumpers labeled 1 2 and 4 are used to select the number of channels Any unused channels are not elaela processed For example if you only select the first four channels then the os 8 8 last four channels will not be active Use this table to determine jumper settings Number of Number of Yes jumper installed Channels Channels No jumper removed Jumpers installed as Selected eel shown selects 8 channel 1 No No No operation 2 No No Yes For example To select 3 No Yes No 3 channel operation remove 4 No Yes Yes the 4 and 1 jumpers and 5 Yes No No l 6 Yes No Yes install the 2 jumper 7 Yes Yes No 8 Yes Yes Yes F4 08AD 8 Channel Analog Input 55 Selecting Notice the eight jumpers for selecting current or voltage settings for each individual Current or channel For each channel install the jumper when you are using
9. D instruction An example of how to do this using an ANDD instruction is shown in the previous section The following program example shows how to read the analog data into V memory locations with DL440 and DL450 CPUs Once the data is in V memory you can perform math on the data compare the data against preset values and so forth This example will read one channel per scan so it will take eight scans to read all eight channels SP1 LDF X20 K12 BCD LDF X34 K3 OUTX V3000 Note This example uses SP1 which is always on You could also use an X C etc permissive contact Loads the first 12 bits of channel data starting with location X20 from the module into the accumulator Converts the binary value in the accumulator to BCD and stores the result in the accumulator Use this BCD conversion if you want the channel data to be stored as BCD Do not use this instruction if you are going to send the data to an internal PID loop because the PID loop requires the PV process variable to be in binary format Loads the binary value of the three channel indicator bits plus the MSB into the accumulator and pushes the channel data loaded into the accumulator from the first LDF instruction into the first level of the stack X34 X20 14 OUTX copies the 16 bit value from the first level of the accumulator stack to a source address offset by the value in the accumula
10. F4 08AD 8 Channel Analog Input In This Chapter Module Specifications Setting the Module Jumpers Connecting the Field Wiring Module Operation Writing the Control Program 6 2 F4 08AD 8 Channel Analog Input Module Specifications Analog Input Configuration Requirements E 2 D 2 Cc lt po fa Z pos 9 oe The F4 08AD Analog Input module provides several features and benefits PES ANALOG INPUT It accepts eight single ended IN DL450 CPUs only com CH7 IN CH8 IN 24VDC 0 1A 24 Vv voltage or current inputs HE 0 Analog inputs are optically isolated eee D from PLC logic components com eS The module has a removable a terminal block so the module can a li be easily removed or changed COM os B without disconnecting the wiring om j All eight analog inputs may be read ae Lm in one CPU scan DL440 and cne eee The F4 08AD Analog Input module requires 16 discrete input points The module can be installed in any slot of a DL405 system including remote bases The limitations on the number of analog modules are e For local and expansion systems the available power budget and discrete I O points e For remote I O systems the available power budget and number of remote I O poin
11. being operated from a 36 VDC supply with a recommended load resistance of 750 ohms Since the module has a 250 ohm resistor you need to add an additional resistor R Tr Mr R resistor to add R 750 250 Tr Transmitter Requirement R 500 Mr Module resistance internal 250 ohms DC Supply Module Channel 1 OV T 250 36V R 7 ohms Two wire Transmitter Removable The F4 08AD module has a removable connector to make wiring easier Simply Connector remove the retaining screws and gently pull the connector from the module SN 3 fe D gt v fe eo G F4 08AD 8 Channel Analog Input Wiring Diagram NOTE 1 Shields should be grounded at the signal source NOTE 2 Unused channels should be connected to OV or have current jumpers installed Internal Module Wiring AtoD Convertor ANALOG INPUT 8 CHANNELS See NOTE 1 ry CH1 CH1 ey IN 250 ohms Voltage gt ap ov e _w Transmitter ao cH2 lan gt mee QU IN 250 ohms Ru O Voltage CH3 IN 250 ohms i CH3 BD 9 Transmitter ap OV T Dml A gt CH4 me NOY IN L 250 ohms 2 Channels 3 6 are not used Wi ov
12. cC 9 oe Wiring Guidelines User Power Supply Requirements Custom Input Ranges Your company may have guidelines for wiring and cable installation If so you should check those before you begin the installation Here are some general things to consider e Use the shortest wiring route whenever possible e Use shielded wiring and ground the shield at the transmitter source Do not ground the shield at both the module and the source e Don t run the signal wiring next to large motors high current switches or transformers This may cause noise problems e 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 The F4 08AD module requires a separate power supply The Series DL405 CPUs D4 RS Remote I O Controller and D4 EX Expansion Units have built in 24 VDC power supplies that provide up to 400mA of current If you only have a couple analog modules you can use this power source instead of a separate supply If you have more than four analog modules or you would rather use a separate supply choose one that meets the following requirements 24 VDC 10 Class 2 100 mA current per module Occasionally you may have the need to connect a transmitter with an unusual signal range By changing the wiring slightly and adding an external resistor to convert the current to voltage you can eas
13. channel 1 There are ways around this Later we ll show you how to write a program that will get all eight channels in one scan Unused channels are not processed so if you select only two channels then each channel will be updated every other scan iJ p 6 9 Scan p a Read inputs Ks Y Scan N lt Channel 1 Execute Application Program Read the data Scan N 1 lt _ Channel 2 1 Store data Scan N 7 lt _ Channel 8 1 Scan N 8 lt _ Channel 1 Write to outputs lt lt J Even though the channel updates to the CPU are synchronous with the CPU scan the module asynchronously monitors the analog transmitter signal and converts the signal to a 12 bit binary representation This enables the module to continuously provide accurate measurements without slowing down the discrete control logic in the RLL program Input Bit Assignments Active Channel Indicator Inputs F4 08AD 8 Channel Analog Input S11 You may recall the F4A O8AD module requires 16 discrete input points from the CPU These 16 points provide e An indication of which channel is active e The digital representation of the analog signal Since all input points are automatically mapped into V memory it is very easy to determine the location of the data wo
14. e one of the programs shown that reads one channel per scan Starts the FOR NEXT loop The constant K8 specifies how many SP1 K8 times the loop will execute Enter a constant equal to the number of FOR channels you are using For example enter K4 if you re using 4 N channels SP1 Immediately loads the first 12 bits of the data word starting with X20 Ts X20 into the accumulator The LDIF instruction will retreive the I O points 12 without waiting on the CPU to finish the scan Since the DL405 CPUs perform math operations in BCD it is usually best to convert the data to BCD immediately You can leave out this instruction if your application does not require it such as PID loops BCD This LDIF instruction immediately loads the three channel indicator bits into the accumulator For this module the last bit in the word must be read also that s why the K4 is used Otherwise only one channel will be read LDIF X34 K4 Wares The OUTX instruction stores the channel data to an address that starts at V3000 plus the channel offset For example if channel 3 was being read the data would be stored in V3002 V3000 2 NEX Module Reading Acc Bits Offset Data Stored in Channel 1 000 0 V3000 Channel 2 001 Channel 3 010 Channel 4 011 Note this example uses SP1 which is Channel 5 100 always on You could Channel 6 101 also use an X C etc Channel 7 110 permissive con
15. es rh T See NOTE 2 CH5 D IN J ohms oy yore ZN S CH6 get NAT IN 250 ohms CH7 5 AN cuz 2 wire ex NOTIN 250 ohms TNS oy 2b CH8 lan CHB NAT IN 250 ohms 3 wire D 4 20mA amp J i Transmitter umpers for HS 24V CH5 7 amp 8 Optional N G are installed External T ov P S 24VDC y typical 18 30VDC ov More than one external power supply can be used see channel 8 If the power supply common of an external power supply is not connected to OV on the module then the output of the external transmitter must be isolated To avoid ground loop errors recommended 4 20mA transmitter types are 2 or 3 wire Isolation between input signal and power supply 4 wire Isolation between input signal power supply and 4 20mA output a 2 D 2 S lt po Z f pos Q CH3 CH4 COM CH5 COM CH6 COM CH7 COM CH8 COM 24VDC 0 1A o IERE F4 08AD 8 Channel Analog Input Module Operation DL430 Special Even though the module can be placed in any slot it is important to examine the Requirements configuration if you are using a DL430 CPU As you will see in the section on writing the program you use V memory locations to extract the analog data As shown in the following diagram if you place the module so the input points do not start ona V
16. ily adapt this module to meet the specifications for a transmitter that does not adhere to one of the standard input ranges The following diagram shows how this works NOTE Remove current jumper in module Module internal circuitry Field wiring IN gt Analog switch Jumper removed OV 50mA M Current R AM T Transmitter 250 ohms Vmax R Imax R value of external resistor Vmax high limit of selected voltage range 5V or 10V Imax Maximum current supplied by the transmitter Example current transmitter capable of 50mA 0 10V range selected R ii R 200 ohms 50mA NOTE Your choice of resistor can affect the accuracy of the module A resistor that has 0 1 tolerance and a 50ppm C temperature coefficient is recommended 5 7 F4 08AD 8 Channel Analog Input Current Loop Standard 4 to 20 mA transmitters and transducers can operate from a wide variety Transmitter of power supplies Not all transmitters are alike and the manufacturers often specify Impedance a minimum loop or load resistance that must be used with the transmitter The F4 08AD provides 250 ohm resistance for each channel If your transmitter requires a load resistance below 250 ohms then you do not have to make any adjustments However if your transmitter requires a load resistance higher than 250 ohms then you need to add a resistor in series with the module Consider the following example for a transmitter
17. memory boundary the instructions cannot access the data Correct F4 08AD A D P P YA O 8pt 8pt 16pt 16pt 16pt 16pt Input Input Input Input Output Output l G XO X10 X20 X40 X7 X17 X37 X57 i a V40400 V40402 MSB V40401 LSB cn Pa a X X X X 3 32 2 7 07 0 Wrong F4 08AD A l n O rout mp eet mot ouput oupa J lo X30 X40 X7 X27 X37 6 _ Data is split over two locations so instructions cannot access data from a DL430 PEER 86S X X X X X X X X 3 32 2 1 17 0 7 07 0 7 0 SN gt sed D gt v fe eo G E 2 D 2 Cc lt po fa Z pos 9 oe F4 08AD 8 Channel Analog Input Channel Scanning Sequence Before you begin writing the control program it is important to take a few minutes to understand how the module processes and represents the analog signals The F4 08AD module supplies one channel of data per each CPU scan Since there are eight channels it can take up to eight scans to get data for all channels Once all channels have been scanned the process starts over with
18. n depends on the I O 1 40401 configuration See Appendix A for the memory map This instruction masks the channel identification bits Without this RADD the values used will not be correct so do not forget to include it Since the DL405 CPUs perform math operations in BCD it is usually BCD best to convert the data to BCD immediately You can leave out this instruction if your application does not require it such as for PID loops which require the process variable to be in binary format LD This load instruction reads the data into the accumulator again The V40401 channel data will be pushed into the first level of the stack This instruction masks the analog data values and leaves the ANDD channel ID bits in the accumulator K7000 Now you have to shift the accumulator bits so the channel ID bits will result in a value between 0 and 7 binary format This value is the offset and indicates which channel is being processed in that scan SHFR K12 OUTX OUTX copies the value from the first level of the accumulator V3000 stack to a source address offset by the value in the accumulator In this case it adds the above binary value 0 7 to V3000 The particular channel data is then stored in its respective location For example if the binary value of the channel select bits is 0 then channel 1 data is stored in V memory location V3000 V3000 0 and if the binary value is 6
19. rd that will be assigned to the module F4 08AD Al L A y es A O 8pt 8pt 16pt 16pt 16pt 16pt Input Input Input Input Output Output XO X10 X20 X40 X7 X17 X37 X57 Mmd _ v40400 v40402 v40401 MSB LSB ee EES i N Bit 15 14 13 12 1110 9 8 765 43 21 0 x xx x 3 32 2 7 07 0 Within this word location the individual bits represent specific information about the analog signal The bits inputs shown in the diagram indicate the active channel The next to V40401 last three bits of the V memory location MSB LSB indicate the active channel The inputs OO are automatically turned on and off on 1111119876543210 each CPU scan to indicate the active 543210 channel Channel E channel inputs Scan Inputs Channel N 000 1 N 1 001 2 N 2 010 3 N 3 011 4 N 4 100 5 N 5 101 6 N 6 110 7 N 7 111 8 SN gt sed D gt v fe eo G 5 12 F4 08AD 8 Channel Analog Input ar gt Q oO 2 O S lt D fa G oO 2 Q oe Analog Data Bits Unusable MSB Bit The first twelve bits represent the analog data in binary format V40401 Bit Value Bit Value MSB LSB j ee 1111119876543210 4 128 543210 2 4 8 256 3 8 9 512 l 4 16 10
20. tact V3001 V3002 V3003 V3004 V3005 V3006 V3007 NO BR WD Channel 8 111 Most applications usually require H L measurements in engineering units Units A 4095 which provide more meaningful data This is accomplished by using the H high limit of the Engineering conversion formula shown unit range You may have to make adjustments to L low limit of the Engineering the formula depending on the scale you unit range choose for the engineering units A Analog value 0 4095 For example if you wanted to measure pressure PSI from 0 0 to 99 9 then you would have to multiply the analog value by 10 in order to imply a decimal place when you view the value with the programming software or a handheld programmer Notice how the calculations differ when you use the multiplier F4 08AD 8 Channel Analog Input 5 17 Analog Value of 2024 slightly less than half scale should yield 49 4 PSI Example without multiplier Units a H gt L 4095 PEOS 100 0 Units 2024 4095 Units 49 Handheld Display V 3101 V 3100 V MON 0000 0049 Example with multiplier Units 10 A HOE 4095 hte 100 0 Units 20240 4095 Units 494 Handheld Display V 3101 V 3100 V MON 0000 0494 Value is more accurate Here s how you would write the program to perform the engineering unit conversion This example uses SP1 which is always on You could also
21. tor In this case it adds the above binary value which is the offset to V3000 The particu lar channel data is then stored in its respective location For example if the binary value of the channel select bits is 0 then channel 1 data is stored in V memory location V3000 V3000 0 and if the binary value is 6 then the channel 7 data is stored in location V3006 V3000 6 See the following table Module Reading Acc Bits Offset Data Stored in 9 Channel 1 000 0 V3000 D Channel 2 001 1 V3001 Channel 3 010 2 V3002 Channel 4 011 3 V3003 Channel 5 100 4 V3004 oO Channel 6 101 5 V3005 Channel 7 110 6 3006 3 Channel 8 111 7 V3007 S F4 08AD 8 Channel Analog Input Reading Eight Channels in One Scan DL440 450 XI viv 430 440 450 Scaling the Input Data E 2 D 2 Cc lt po fa Z pos 9 oe The following program example shows how to read all eight channels in one scan by using a FOR NEXT loop Before you choose this method do consider its impact on CPU scan time The FOR NEXT routine shown here will add about 16ms 2ms loop to the overall scan time If you do not need to read the analog data on every scan change SP1 to a permissive contact such as an X input CR or stage bit to only enable the FOR NEXT loop when it is required NOTE Do not use this FOR NEXT loop program to read the module in a remote slave arrangement it will not work Us
22. ts Check the user manual for your particular model of CPU for more information regarding power budget and number of local or remote I O points F4 08AD 8 Channel Analog Input 5 3 The following table provides the specifications for the F4 O8AD Analog Input Module Review these specifications to ensure the module meets your application requirements pda i Number of Channels 8 single ended one common ecifications p Input Ranges 0 5V 0 10V 1 5V 5V 10V 0 20 mA 4 20 mA Resolution 12 bit 1 in 4096 Active Low pass Filtering 3 dB at 20Hz 12 dB per octave Input Impedance 250 ohms 0 1 1 2W current input gt 20 Megohms voltage input 1 Megohm mini mum Absolute Maximum Ratings 45 mA current input 75V voltage input Conversion Time 0 4ms per channel module conversion 1 ms per selected channel minimum CPU Linearity Error End to End 1 count 0 025 of full scale maximum Input Stability 1 2 count Full Scale Calibration Error 12 counts maximum voltage input Offset error not included 12 counts maximum 20mA current input Offset Calibration Error 2 counts maximum unipolar voltage input 4 counts maximum bipolar voltage input 4 counts maximum 4 mA current input General _ PLC Update Rate 8 Channel per scan max Specifications Digital Input Points Required 16 X input points total 12 binary data bits 3 active channel bits Power Budget Requirement
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