Chapter 11 - AutomationDirect
Contents
1. M Analog Input Ladder Logic Filter PID Loops Filtering Please refer to the PID Loop Operation chapter in the DL06 or DL05 User Manual for information on the built in PV filter DL05 06 and the ladder logic filter DL06 only shown below A filter must be used to smooth the analog input value when auto tuning PID loops to prevent giving a false indication of loop characteristics Smoothing the Input Signal DL06 only The filter logic can also be used in the same way to smooth the analog input signal to help stabilize PID loop operation or to stabilize the analog input signal value for use with an operator interface display etc WARNING The built in and logic filters are not intended to smooth or filter noise generated by improper field device wiring or grounding Small amounts of electrical noise can cause the input signal to bounce considerably Proper field device wiring and grounding must be done before attempting to use the filters to smooth the analog input signal Using Binary Data Format SP1 Loads the analog signal which is in binary format LDD and has been loaded from V memory location V2000 V2000 2001 into the accumulator Contact SP1 is always on Converts the binary value in the accumulator BTOR to a real number Subtracts the real number stored in location SUBR 1400 from the real number in the accumulator V1400 and stores the result in the accumulator V14002. L K8482 E of output channels set to 2 io The binary format is used for displaying data on some operator interface units The DLO5 PLCs support binary math functions OUT Special V memory location assigned to the option slot contains the v7700 data format and the number of channels to scan This loads an octal value for the first V memory location that will be used au LL OUS to store the incoming data For example the O2000 entered here would designate the following addresses Ch1 V2000 Ch2 V2001 Ch3 V2002 Ch4 V2003 The octal address O2000 is stored here V7701 is assigned to the __ OUT option slot and acts as a pointer which means the CPU will use the V7701 octal value in this location to determine exactly where to store the incoming data This loads an octal value for the first V memory location that will be used LDA to store the output data For example the O2010 entered here would O2010 designate the following addresses Ch1 V2010 Ch2 V2011 The octal address O2010 is stored here V7702 is assigned to the __ OUT option slot and acts as a pointer which means the CPU will use the V7702 octal value in this location to determine exactly where to get the output data DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 11 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination LL ______________________________________________
3. FO 4AD2DA 1 4 CH CHAPTER IN 2 CH OUT ANALOG CURRENT COMBINATION In This Chapter Mod le Specifications oec 9 DOR a AZAR 978978 6 T9 18 78 a pease a Je 11 2 Setting the Module Jumper seeeee nnn 11 4 Connecting and Disconnecting the Field Wiring 0 0 0 eee eee 11 5 Wiring Diagram 2 55 59 ER Fi es thew ENE EER TAA TNA VR RA Ea ha ye 11 6 Module Operati scere rene erent e yh RR A EE Fa a wie a 11 7 Special V memory Locations 0 ccc cece ee eee eee eens 11 8 Using the Pointer in Your Control Program 0 eee ee eee eee 11 11 Scale Conversions 4 65 peces mr rt tae aa aa aa ES en Kee see a or esee alee ee 11 13 Module Resolution 5 524 hth hh t RA RR aid a ss a R UR ACE wo wee e Dee DR i8 Da 11 16 Analog Input Ladder Logic Filter 0 0 ccc cc eee ee eee 11 17 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination g Module Specifications The FO 4AD2DA 1 Analog Combination module offers the following features The analog input and output channels are updated in one scan The removable terminal block makes it possible to remove the module without disconnecting the field wiring Analog inputs can be used as process variables for the four 4 PID loops in the DL05 and the eight 8 PID loops in the DL06 CPUs On board active analog filtering and RISC like m
4. K4095 Multiply the accumulator by 4095 DIV Divide the accumulator by 1000 this is the maximum value of K1000 V2300 L OUT Store the BCD result in V2010 the V memory location set up to V2010 send the data to Ch 1 output SP1 LD The LD instruction loads the engineering units used with Ch 2 into the V2301 accumulator This example assumes the numbers are BCD Since SP1 is used this rung automatically executes on every scan You could also use an X C etc permissive contact MUL i K4095 Multiply the accumulator by 4095 DIV Divide the accumulator by 1000 this is the maximum value of K1000 V2301 OUT Store the BCD result in V2011 the V memory location set up to send V2011 the data to Ch 2 output l 14 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination Analog and Digital Value Conversions Sometimes it is useful to convert between the signal levels and the digital values This is especially helpful during machine startup or troubleshooting The following tables provide formulas to make this conversion easier Range If you know the digital value If you know the analog signal level 16D 4095 A p 40950 _ For example if you have measured the signal as 10mA We A79 you can use the formula to determine the digital value 4095 D that will be stored in the V memory location that D 10mA 4 contains the data D 255 98 6 D 15
5. 1 12 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination n Scale Conversions Scaling the Input Data Units A i zd Many applications call for measurements in engineering units which can be more meaningful than raw data Convert to engineering units using the formula shown to the right H High limit of the engineering unit range L Low limit of the engineering You may have to make adjustments to the formula unit range depending on the scale you choose for the engineering units A Analog value 0 4095 For example if you wanted to measure pressure PSI from 0 0 to 100 0 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 Analog Value of 2024 slightly less than half scale should yield 49 4 PSI Example without multiplier Example with multiplier wa a H L uel H L Units A 4095 L Units 10A 4095 L Units 2024 100 0 49 Units 20240 100 0 9 4095 4095 Units 49 Units 494 u DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 ll 13 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination LC meea S SA The Conversion Program The following example shows how you would write the program to perform the
6. The lower byte selects the output data format i e O BCD 8 Binary and the number of output channels set to 2 or ecce Tow LD The binary format can be used for displaying data on some K8482 operator interface units and on the DLO6 LCD display The DLO6 PLCs support binary math functions OUT V710 Special V memory location V710 assigned to the option slot contains the data format and the number of channels to scan This loads an octal value for the first V memory location that will be used __ LDA to store the incoming data For example the 02000 entered here would 02000 s designate the following addresses Ch1 V2000 Ch2 V2001 Ch3 V2002 Ch4 V2003 The octal address O2000 is stored here V711 is assigned to the OUT n i option slot and acts as a pointer which means the CPU will use the V711 a octal value in this location to determine exactly where to store the incoming data This loads an octal value for the first V memory location that will be used Deni 0 to store the output data For example the O2010 entered here would designate the following addresses Chi V2010 Ch2 V2011 The octal address O2010 is stored here V712 is assigned to the OUT option slot and acts as a pointer which means the CPU will use the V712 octal value in this location to determine exactly where to get the output data
7. engineering unit conversion from input data formats 0 4095 This example assumes the raw input data read at V2000 is in BCD format Note this example uses SP1 which is always on You could also use an X C etc permissive contact SES LD When SP1 is on load channel 1 data to the accumulator for L v2000 a range of 0 1000 MUL Multiply the accumulator by 1000 K1000 DIV Divide the accumulator by 4095 the module resolution K4095 OUT Store the result in V2100 V2100 Output Conversion Program The following example program shows how you would write the program to perform the engineering unit conversion to output data formats 0 4095 This example assumes you have calculated or loaded the engineering unit values between 0 1000 in BCD format and stored them in V2300 and V2301 for channels 1 and 2 respectively Both the DL05 and DL06 offer instructions that allow you to perform math operations using BCD format It is usually easier to perform any math calculations in BCD and then convert the value to binary before you send the data to the module SP1 LD The LD instruction loads the engineering units used with channel 1 into V2300 the accumulator This example assumes the numbers are BCD Since I SP1 is used this rung automatically executes on every scan You could also use an X C etc permissive contact MUL
8. is the designated workspace in this example Multiplies the real number in the accumulator by MULR 0 2 the filter factor and stores the result in the RO 2 accumulator This is the filtered value The filter range is 0 1 to 0 9 Smaller filter factors increase filtering 1 0 eliminates filtering ADDR Adds the real number stored in location V1400 1 to the real number filtered value in the V1400 accumulator and stores the result in the accumulator OUTD Copies the value in the accumulator to V1400 location V1400 RTOB Converts the real number in the accumulator to a binary value and stores the result in the accumulator Loads the binary number filtered value from OUT the accumulator into location V2100 to use in V2100 your application or PID loop DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 1 17 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination SP1 Using BCD Data Format LD V2000 BIN BTOR SUBR V1400 ADDR V1400 OUTD V1400 RTOB BCD OUT V1402 NOTE Be careful not to do a multiple number conversion on a value For example if you are using the pointer method in BCD format to get the analog value it must be converted to binary BIN as shown below If you a
9. is user selectable For example loading O2010 causes the pointer to read Ch 1 s data value at V2010 and Ch 2 s data value at V2011 You will find an example program that loads appropriate values to V710 V711 and V712 on page 11 12 1 1 10 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination S Using the Pointer in Your Control Program DLO05 Pointer Method The DL05 CPU examines the pointer values the memory locations identified in V7700 V7701 and V7702 on the first scan only The example program below shows how to setup these locations for 4 input channels and 2 output cahneels This rung can be placed 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 analog input and output data into V memory locations Once the data is in V memory you can perform math on the data compare the data against preset values and so forth V2000 and V2010 are used in the example the V memory locations are user selectable SPO IL K402 Or Loads a constant that specifies the number of channels to scan and the data format The upper byte selects the input data format i e O BCD ieu 8 Binary and the number of input channels set to 4 The lower byte LD selects the output data format i e 0 BCD 8 Binary and the number
10. to the PLC and the field devices Pull the terminal block firmly until the connector separates from the module The analog module can be removed from the PLC by folding out the retaining tabs at the top and bottom of the module As the retaining tabs pivot upward and outward the module s connector is lifted out of the PLC socket Once the connector is free you can lift the module out of its slot DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 ll 5 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination LL ____________________________________________________ Wiring Diagram Use the following diagram to connect the field wiring If necessary the terminal block can be removed to make removal of the module possible without disturbing field wiring Typical User Wiring See NOTE 1 Internal Module CH1 iri 2 wire Wiring LL Current Analog In Out Transmitter IN 4 In 2 Out ee a 0 20mA 2 wire 4 20mA Current Transmitter 2 1250 4 gt cus t 8 wire sam AtoD IN 4 Current 3 EE L Converter Transmitter w 1 JE e s gu 4 p 2n 2 rm
11. 36 Range If you know the digital value If you know the analog signal level 20D 4095 0 to 20mA i095 D 4085 A This example shows the result for the 0 to 20mA range 20 _ 4095 D 79 10mA D 204 75 10 D 2047 5 E DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 l 15 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination TEL ee Module Resolution Analog Data Bits The first twelve bits represent the analog data in binary format MSB LSB Bit Value Bit Value 0 1 6 64 119876543210 1 2 7 128 dn 2 4 8 256 3 8 9 512 data bits 4 16 10 1024 5 32 11 2048 Resolution Details Since the module has 12 bit resolution the analog signal is converted from 4096 counts ranging from 0 4095 212 For example a mA signal would be 0 and 20mA signal would be 4095 This is equivalent to a binary value of 0000 0000 0000 to 1111 1111 1111 or 000 to FFF hexadecimal The diagrams below show how this relates to the two signal ranges 4 20mA an H L Resolution 4095 H high limit of the signal range L low limit of the signal range OCounts 4095 16mA 4095 3 907uA per count 20mA V 20mA 4095 4 884y A per count OmA 1 OCounts 4095 l 16 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination
12. _____ DLO06 Pointer Method Use the special V memory table as a guide to setup the pointer values in the following example for the DLOG Slot 1 is the left most option slot The CPU will examine the pointer values at these locations only after a mode transition first scan only Analog Combination Module DLO6 Special V memory Locations 2 V710 V711 V712 The F0 4AD2DA 1 can be installed in any available DLO6 option slot Using the example program from the previous page but changing the V memory addresses the ladder diagram below shows how to setup these locations for 4 input channels and 2 output channels with the module installed in slot 2 of the DLO6 Use the above table to determine the pointer values if locating the module in any of the other slot locations Place this rung anywhere in the ladder program or in the initial stage if you are using stage programming instructions Like the DLO5 example this logic is all that is required to read the analog input data into V memory locations Once the data is in V memory you can perform mathmatical calculations with the data compare the data against preset values and so forth V2000 and V2010 is used in the example but you can use any user V memory location SPO H LD Loads a constant that specifies the number of channels to scan and the K402 data format The upper byte selects the input data format i e 0 BCD 8 Binary and the number of input channels set to 4
13. ation Structure of V7702 V7702 is a system parameter that points to a V memory location used for storing analog output data The V memory location loaded in V7702 is an octal number identifying the first V memory location for the analog output data This V memory location is user selectable For example loading O2010 causes the pointer to read Ch 1 s data value at V2010 and Ch 2 s data value at V2011 You will find an example program that loads appropriate values to V7700 V7701and V7702 on page 11 11 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 ll 9 Chapter 11 F0 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination ee DLO06 Data Formatting Special V memory locations are assigned to the four option module slots of the DL06 PLC The table below shows these V memory locations which can be used by the FO C4AD2DA 1 Analog Combination Module DLO6 Special V memory Locations Slot No Data Type and Number of Channels Input Storage Pointer Output Storage Pointer Setup Data Type and Number of Channels V memory locations 700 710 720 and 730 are used to set the number of output channels the number of input channels and the data type binary or BCD The low byte equals the number of output channels and the high byte equals the number of input channels Enter a 1 through 4 to select the number of input channels and a 1 through 2 to select the number of output channels to be
14. d 10 counts maximum 20mA current input Offset Calibration Error 5 counts maximum OmA current input Maximum Inaccuracy 4 25 C 77 F 85 0 to 60 C 32 to 140 F Accuracy vs Temperature 100 ppm typical full scale calibration including maximum offset change Recommended Fuse external 0 032 A Series 217 fast acting current inputs One count in the specification table is equal to one least significant bit of the analog data value 1 in 4096 Number of Channels Output Specifications 2 single ended one common Output Range 4 to 20 mA or 0 to 20 mA jumper selectable Output Type Current sourcing Resolution 12 bit 1 in 4096 for 0 to 20 mA scaled for 4 to 20 mA Maximum Loop Voltage 30 VDC Load ohms Loop Power Supply 0 300 18 30V Linearity Error end to end 2 counts 0 050 of full scale maximum Conversion Settling Time 400uS max full scale change Full Scale Calibration Error Note Error depends on the load from source terminal to ground 26 counts max 3000 load 18 counts max 2500 load 12 counts max 1250 load Offset Calibration Error 10 counts max 3000 load 8 counts max Q 2500 load 6 counts max 1250 load Max Full Scale Inaccuracy of full scale all errors included 300 load 0 4 60 C 2500 load 0 3 60 C 1250 load 0 2 60 C One count in the s
15. icrocontroller provide digital signal processing to maintain precise analog measurements in noisy environments firmware version 3 30 or later The DL06 requires DirectSOFT32 version V4 0 build 16 or later and NOTE The DLO5 CPU s analog feature for this module requires DirectSOFT32 Version 3 0c or later and firmware version 1 00 or later See our website for more information www automationdirect com ll 2 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination The following tables provide the specifications for the FOC4AD2DA 1 Analog Combination Module Review these specifications to make sure the module meets your application requirements Input Specifications Number of Channels 4 single ended one common Input Range 0 to 20 mA or 4 to 20 mA jumper selectable Resolution 12 bit 1 in 4096 for 0 20mA scaled for 4 20mA Step Response 25 0 ms typ to 95 of full step change Crosstalk 80 dB 1 2 count maximum Active Low pass Filtering 3 dB at 40Hz 12 dB per octave Input Impedance 125 Ohm 0 196 1 8 W current input Absolute Maximum Ratings 30 mA to 30 mA current input Converter type Successive approximation Linearity Error End to End 2 counts Input Stability 1 count Full Scale Calibration Error Offset error not include
16. ition J2 n C14 disconnect power to the PLC and all field devices Failure to disconnect power can result in damage to WARNING Before removing the analog module or the terminal block on the face of the module the PLC and or field devices 11 4 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination Connecting and Disconnecting the Field Wiring Wiring Guidelines 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 Use the shortest wiring route whenever possible Use shielded wiring and ground the shield at the transmitter source Do not ground the shield at both the module and the source Do not run the signal wiring next to large motors high current switches or transformers This may cause noise problems 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 A separate transmitter power supply may be required depending on the type of transmitter being used This module has a removable connector to make wiring and module removal easier To remove the terminal block disconnect power
17. location 7700 is used for identifying the number of output channels the number of input channels and the data type binary or BCD The low byte equals the number of output channels and the high byte equals the number of input channels Enter a 1 through 4 to select the number of input channels and a 1 through 2 to select the number of output channels to be ET used A zero 0 entered for channel selection will cause the channel either input or output to be inoperative Loading a constant of 402 into V7700 identifies MSB LSB four input and two output analog channels and sets the I O data type to BCD LOW BYTE Loading a constant of 8482 into V7700 identifies four input and two output analog channels and sets the I O data type to binary HIGH BYTE Structure of V7701 V7701 is a system parameter that points to a V memory location used for storing analog input data The V memory location loaded in V7701 is an octal number identifying the first V memory location for the analog input data This V memory location is user selectable For example loading O2000 causes the pointer to write Ch 1 s data value to V2000 Ch 2 s data value to V2001 CH 35 data value to V2002 and Ch 45 data value to V2003 MSB LSB 1 1 8 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combin
18. pecification tables is equal to one least significant bit of the analog data value 1 in 4096 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 ll 3 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination ____________________________________________________ General Specifications PLC Update Rate 4 input channels per scan 2 output channels per scan 16 bit Data Word 12 binary data bits Operating Temperature 0 to 60 C 32 to 140 F Storage Temperature 20 to 70 C 4 to 158 F Relative Humidity 5 to 95 non condensing Environmental Air No corrosive gases permitted Vibration MIL STD 810C 514 2 Shock MIL STD 810C 516 2 Noise Immunity NEMA ICS3 304 Power Budget Requirement 100 mA 5VDC supplied by base Connector Phoenix Mecano Inc Part No AK1550 8 3 5 green Connector Wire Size 28 16 AWG Connector Screw Torque 0 4 Nm Connector Screwdriver Size DN SS1 recommended Setting the Module Jumper The position of the J2 jumper determines the input and output signal level You can choose between 0 20mA and 4 20mA signal levels The module ships without the jumper connecting the pins pins not jumpered In this position the input and output signal level is 4 20mA To select 0 20mA signal level install the jumper connecting the pins ET OOOOOOOO The J2 jumper is shown in the 4 20mA position not installed Install the jumper for the 0 20mA pos
19. re using the pointer method in Binary format the conversion to binary BIN instruction is not needed Loads the analog signal which is in BCD format and has been loaded from V memory location V2000 into the accumulator Contact SP1 is always on Converts the BCD value in the accumulator to binary Converts the binary value in the accumulator to a real number Subtracts the real number stored in location V1400 from the real number in the accumulator and stores the result in the accumulator V1400 is the designated workspace in this example Multiplies the real number in the accumulator by 0 2 the filter factor and stores the result in the accumulator This is the filtered value The filter range is 0 1 to 0 9 Smaller filter factors increase filtering 1 0 eliminates filtering Adds the real number stored in location V1400 to the real number filtered value in the accumulator and stores the result in the accumulator Copies the value in the accumulator to location V1400 Converts the real number in the accumulator to a binary value and stores the result in the accumulator Converts the binary value in the accumulator to a BCD number Note The BCD instruction is not needed to PID loop PV loop PV is a binary number Loads the BCD number filtered value from the accumulator into location V1402 to use in your application or PID loop 1 1 18 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11
20. rity of applications the process changes are much slower than these updates that some manufacturers refer to the time it takes to convert the analog signal to a digital value Our analog to digital conversion takes only a few microseconds It is the settling time of the filter that is critical in determining the full update time Our update time specification includes the filter settling time NOTE If you are comparing other manufacturers update times step responses with ours please be aware DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 11 7 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination _______________________________________________________ Special V memory Locations Formatting theModule Data The DL05 and DL06 PLCs have three special V memory locations assigned to their respective option slots These V memory locations allow you to specify the data format binary or BCD specify the number of input and output channels to scan specify the V memory locations to store the input data specify the V memory locations to store the output data DLO05 Data Formatting The table below shows the special V memory locations used by the DL05 PLC for the analog combination module Analog Combination Module DLO5 Special V memory Locations Data Type and Number of 1 0 Channels V7700 Input Storage Pointer V7701 Output Storage Pointer V7702 Structure of V7700 V memory
21. used A zero 0 entered for channel selection will cause the channel either input or output to be inoperative Consider the FO 4AD2DA 1 to be installed in MSB LSB slot 2 Loading a constant of 402 into V710 identifies four input and two output analog LOW BYTE channels and sets the I O data type to BCD Loading a constant of 8482 into V710 identifies MSB e four input and two output analog channels and sets the I O data type to binary HIGH BYTE Input Storage Pointer Setup V memory locations 701 711 721 and 731 are special locations used as a storage pointer for the analog input data With the analog module installed in slot 2 the V memory location loaded in V711 is an octal number identifying the first user V memory location to write the analog input data to This V memory location is userselectable For example loading O2000 causes the pointer to write Ch 1 s data value to V2000 Ch 2 s data value to V2001 CH 3 s data value to V2002 and Ch 4 s data value to V2003 Output Storage Pointer Setup V memory locations 702 712 722 and 732 are special locations used as a storage pointer for the analog output data With the analog module installed in slot 2 the V memory location loaded in V712 is an octal number identifying the first user V memory location to read the analog output data from This V memory location
22. v 125 ohms ov 1 1 6 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 11 FO 4AD2DA 1 4 Ch In 2 Ch Out Analog Current Combination Module Operation Input Output Channel Update Sequence The DL05 and DL06 will read four channels of input data and two channels of output data during each scan Each CPU supports special V memory locations that are used to manage the data transfer This is discussed in more detail beginning on the next page Special V memory Locations Scan DL05 DLO6 PLC Read Inputs Y Execute Application Program Read the data Scan N lt Ch 1 2 3 4 IN Ch 1 2 OUT Scan N 1 lt Ch 1 2 3 4 IN Ch 1 2 OUT Store data Scan N 2 lt Ch 1 2 3 4 IN Ch 1 2 OUT Scan N 3 lt Ch 1 2 3 4IN Ch 1 2 OUT Y Scan N 4 lt Ch 1 2 3 4 IN Ch 1 2 OUT Write to Outputs Analog Module Updates Even though the channel updates to the CPU are synchronous with the CPU scan the module asynchronously monitors the analog transmitter signals and converts each signal into 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 The module takes approximately 25 milliseconds to sense 95 of the change in the analog signal For the vast majo
23. wire as Current J 1 ov 3a IE Transmitter g 4 E J ov r n CH 1 load DtoA 3000 E F4 comede N 3 n maximum 2 2 mr resistance DEA 4 to ade A a mae Amen 3000 our maximum 4 F0 4AD2DA 1 resistance OUT e hs ov Transmitter NOTE 1 Shields should be grounded at the signal Power Supply source NOTE 2 Connect all external power supply commons Current Loop Transmitter Impedance Manufacturers of transmitters and transducers specify a wide variety of power sources for their products Follow the manufacturer s recommendations In some cases manufacturers specify a minimum loop or load resistance that must be used with the transmitter The F0 04AD2DA 1 provides 125 ohm resistance for each channel If your transmitter requires a load resistance below 125 ohms you do not have to make any changes However if your transmitter requires a load resistance higher than 125 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 supply with a recommended load resistance of 750 ohms Since the module has a 125 ohm resistor you need to add an additional resistor R Tr Mr R resistor to add R 2750 125 Tr Transmitter Requirement R 625 Mr Module resistance internal 125 ohms Two wire Transmitter Module Channel 1 DC Supply R CH1 30V COM o
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