Chapter 14 - AutomationDirect
Contents
1. The octal address 02000 is stored here Special V memory location OUT V701 is assigned to option slot 1 and acts as a pointer which means v701 the CPU will use the octal value in this location to determine exactly where to store the incoming data LD Loads a 0 into the accumulator to set the following parameters in KO V703 V706 Special V memory location assigned to option slot 1 that specifies OUT the RTD Input Type KO selects a type Pt100 RTD V703 i See table on page 14 8 for selections Special V memory location assigned to option slot 1 that specifies OUT the Units Code temperature scale and data format selections V704 KO selects a F temperature scale and magnitude plus sign bit format See truth table on page 14 9 for selections Special V memory location assigned to option slot 1 that specifies the OUT RTD up scale down scale burnout value KO selects an up scale V706 burnout value of 7FFFh BCD HEX or 32 767 Binary The value is written to the channel input register when a RTD burnout occurs DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 13 Chapter 14 FO O4RTD 4 Channel RTD Input a DLO06 Example 2 The example program below shows how to setup the FO 04RTD in option slot 2 for 2 input channels enabled use of a type Cul0 RTD on the first 2 input channels BCD channel data format C temperature scale 2 s complement fo2. FO O4RTD 4 CHANNEL CHAPTER RTD INPUT In This Chapter Module Specifications ss sissa sa sucs ccc eee ee ee ee ak eens 14 2 Connecting and Disconnecting the Field Wiring 0000008 14 4 Module Operation 0 cece cee eee eee eee eens 14 6 Special V memory Locations 0 0 ce eee ee eee eee nee 14 7 Configuring the Module in Your Control Program 0 0 ee eee 14 11 Negative Temperature Readings with Magnitude Plus Sign 14 15 Analog Input Ladder Logic Filter 0 0 0 0 cece cece eee ee eee 14 18 RTD Burnout Detection Bits 0 0 ce ec ee ee ee eee eee eee 14 20 Chapter 14 FO O4RTD 4 Channel RTD Input a Module Specifications The F0 04RTD 4 Channel Resistive Temperature Detector Input Module provides the following features and benefits e Provides four RTD input channels with 0 1 C F temperature resolution e Automatically converts type Pt100Q jPt100Q Pt1000Q 10Q Cu 25Q Cu 120Q Ni RTD signals into direct temperature readings No extra scaling or complex conversion is required e Temperature data can be expressed in F or C and as magnitude plus sign or 2 s complement e Precision lead wire resistance compensation by dual matched current sources and ratiometric measurements Works with three wire and four wire RTDs e The temperature calculation and linearization are based on data provided by the National Institute of Standards and Technol
3. 200 0 C to 260 0 C 328 F to 500 F 1200 Ni 80 0 C to 260 0 C 112 F to 500 F Resolution 16 bit 1 in 65535 Display Resolution 0 1 C 0 1 F 3276 7 Absolute Maximum Ratings Fault Protected Inputs to 50VDC Converter Type Charge Balancing 24 bit Sampling Rate 140ms per channel Linearity Error End to End 0 05 C maximum 0 01 C typical PLC Update Rate 4 channels scan Temperature Drift 15 ppm C maximum Maximum Inaccuracy 1 C RTD Excitation Current 200uA Common Mode Range 0 5VDC Notch Filter Common Mode Rejection gt 50 db notches at 50 60Hz Digital Input Points Required None uses special V memory locations based on slot Power Budget Requirements 70 mA 5VDC supplied by base 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 Replacement Terminal Block DO ACC 4 Wire Size Range amp Connector Screw Torque DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 3 28 16 AWG 0 4Nm DN SS1 Screwdriver Recommended Chapter 14 FO O4RTD 4 Channel RTD Input EMMI Connecting and Disconnecti
4. MULR RO 2 ADDR V1400 OUTD V1400 RTOB BCD OUTD V1402 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 a 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 increases 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 14 Converts the binary value in the accumulator to a BCD number Note The BCD instruction is not needed for 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 DL05 06 Option Modules User Manual 7
5. Channel RTD Input Module Operation Channel Scanning Sequence The DLO5 and DLO6 read all four input channels data during each scan The CPUs support special V memory locations that are used to manage the data transfer This is discussed in more detail on the following page Special V memory Locations DLO5 DLO06 PLC Read Inputs Execute Application Program Read the data Scan N lt Ch 1 2 3 4 Scan N 1 Ch 1 2 3 4 i Store data Scan N 2 Ch 1 2 3 4 Scan N 3 Ch 1 2 3 4 y Scan N 4 lt Ch 1 2 3 4 Write to Outputs Sw J Analog Module Update 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 16 bit binary representation This enables the module to continuously provide accurate measurements 14 without slowing down the discrete control logic in the RLL program The time required to sense the temperature and copy the value to V memory is 140 milliseconds minimum to 560 milliseconds plus 1 scan time maximum number of channels x 140 milliseconds 1 scan time 14 6 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input i Special V memory Locations The DL05 and DLO06 PLCs have special V memo
6. Rev A 08 11 14 17 Chapter 14 FO O4RTD 4 Channel RTD Input i SS Analog Input Ladder Logic Filter PID Loops Filtering Please refer to the PID Loop Operation chapter in the DLO6 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 s Loads the analog signal which is in binary format i LD and has been loaded from V memory location V2000 V2000 into the accumulator Contact SP1 is always on BTOR 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 t
7. accumulator V2002 Remember the data can be negative Contact SP1 is always on ANDD This instruction masks the sign bit of the BCD data if it C K7FFFFFFF is set Without this step negative values will not be correct so do not forget to include it OUTD Put the actual signal value in V2012 Now you can use V2012 the data normally V2003 K8000 G2 i i out Channel 2 data is negative when C2 is on a value of 1 0 reads as 8000 0010 2 0 is 8000 0020 etc 14 16 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input c AASA Negative Temperatures 2 s Complement Binary Pointer Method You can use the 2 s complement mode for negative temperature display purposes while at the same time using the magnitude plus sign of the temperature in your control program The DirectSOFT32 element Signed Decimal is used to display negative numbers in 2 s complement form To find the absolute value of a negative number in 2 s complement invert the number and add 1 as shown in the following example vee K8000 LD Load negative value into the accumulator so we V2000 can convert it to a positive value INV Invert the binary pattern in the accumulator ADDD Add 1 K1 OUT Save Channel 1 data at V2010 V2010 Repeat for other channels as required DL05 06 Option Modules User Manual 7th Ed
8. plus sign or a 16 bit 2 s complement value Bit 0 Temperature Scale 0 Temp in degrees F 1 Temp in degrees C Bit 1 Data Format 0 Magnitude plus sign bit format 1 2 s Complement format Unit Code Register Truth Table Temperature Scale Data Format F Magnitude sign bit eg Magnitude sign bit F 2 s Complement G 2 s Complement Temp scale MSB LSB Data Format DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 9 Chapter 14 FO O4RTD 4 Channel RTD Input i E RTD Burnout Data Value Register This register is used to define either up scale or down scale channel values when a channel RTD burnout occurs Bit 0 Up scale down scale value at Burnout 0 Up scale value at Burnout 7FFFh BCD HEX or 32767 Binary written to CH register 1 Down scale value at Burnout 0000h BCD HEX or 0 Binary written to CH register MSB LSB Up scale down scale Burnout value F Diagnostics Error Register This register is used to determine whether the configuration of the module is valid or not Bit 0 Diagnostic bit 0 Module setup is valid 1 Module setup is not valid MSB LSB Diagnostics bit 14 10 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input aL Configuring
9. pointer which means the CPU will use the octal value in this location to determine exactly where to store the incoming data Loads a constant that specifies the RTD input type K1 selects a type Cu10 RTD Enter a KO KS to specify the RTD Input Type See table on page 14 8 for selections Special V memory location assigned to the option slot that specifies the RTD input type Loads a constant that specifies the Units Code temperature scale and data format K3 selects C and 2 s complement data format See truth table on page 14 9 for selections Special V memory location assigned to the option slot that specifies the temperature scale and data format selections Loads a constant that specifies the RTD burnout data value at burnout K1 specifies a down scale value of 0000h BCD HEX or 0 Binary to be written to the channel input register when a RTD burnout occurs Special V memory location assigned to the option slot that specifies the RTD up scale down scale burnout value The value is written to the channel input register when a RTD burnout occurs 14 12 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input m DL06 Example 1 The example program below shows how to setup the FO 04RTD in option slot 1 for 4 input channels enabled use of a type Pt100 RTD on all 4 input channels BCD channel data format F temperature scale magnitude plus sign bit format and with an up scale
10. ratiometric referencing and automatic offset and gain calibration Wiring Diagram Use the following diagram to connect the field wiring If necessary the F0 04RTD terminal block can be removed to make removal of the module possible without disturbing field wiring Note 1 z CH1 200 uA 8 pi CH1 Current ORD Il COM 5 Source T 2 F T CH2 ict Z Note 2 PEHE g P com ee z Adj E cnz CH3 i S CH3 lt COM r i com a 7 oH Note 3 CH4 m AD E COM Li 6 Chia E cH Ye l eCOM COM eCOM ani HA Ei COM urren F0 04RTD Source A l Notes 1 The three wires connecting the RTD to the module must be the same type and length Do not use the shield or drain wire for the third connection 2 Unused channels require shorting wires jumpers installed from terminals CH to CH to COM to prevent possible noise from influencing active channels This should be done even if the unused channel is not enabled in the V memory configuration 3 Ifa RTD sensor has four wires the plus sense wire should be left unconnected as shown DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 5 Chapter 14 FO O4RTD 4
11. the Module in Your Control Program DLO05 Example 1 The example program below shows how to setup the FO 04RTD for 4 input channels enabled use of a type Pt100 RTD on all 4 input channels BCD channel data format F temperature scale magnitude plus sign bit format and with an up scale burnout value specified 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 temperature or voltage input data into V memory locations Once the data is in V memory you can perform mathematical calculations with the data compare the data against preset values etc V2000 is used in the example but you can use any user V memory location Da a K0400 L K8400 J Loads a constant that specifies the number of input channels to scan and the data format The upper byte most significant nibble MSN selects the data format 0 BCD 8 binary The LSN selects the number of channels 1 2 3 or 4 The binary format is used for displaying data on some operator interface units K8400 enables 4 channels in binary format OUT Special V memory location assigned to the option slot that specifies V7700 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 using 02000 the LDA instruction would d
12. burnout value specified Use the table shown on page 14 7 to determine the pointer values if locating the module in any of the other slots 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 temperature or voltage input data into V memory locations Once the data is in V memory you can perform mathematical calculations with the data compare the data against preset values etc V2000 is used in the example but you can use any user V memory location 1 a or IDo K0400 K8400 4 Loads a constant that specifies the number of input channels to scan and the data format The upper byte most significant nibble MSN selects the data format 0 BCD 8 binary The LSN selects the number of channels 1 2 3 or 4 The binary format is used for displaying data on some operator interface units K8400 enables 4 channels in binary format OUT Special V memory location assigned to option slot 1 that specifies V700 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 to store the incoming data For example the 02000 entered here using LDA g i y 02000 the LDA instruction would designate the following addresses Ch1 V2000 2001 Ch2 V2002 2003 Ch3 V2004 2005 Ch4 V2006 2007 See note on page 14 8
13. e data normally V2000 K8000 C1 uT Channel 1 data is negative when C1 is on a value of S D 1 0 reads as 8010 2 0 is 8020 etc Check Channel 2 SP1 LD Load channel 2 from V memory into the accumulator V2002 Contact SP1 is always on AND This instruction masks the sign bit of the binary data if K7FFF it is set Without this step negative values will not be correct so do not forget to include it OUT Put the actual signal value in V2012 Now you can use V2012 the data normally V2002 K8000 C2 Channel 2 data is negative when C2 is on a value of OUT 4 0 reads as 8010 2 0 is 8020 etc DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 15 Chapter 14 F0 04RTD 4 Channel RTD Input a Magnitude Plus Sign BCD Check Channel 1 aa LDD Load channel 1 data from V memory into the i V2000 accumulator Remember the data can be negative Contact SP1 is always on ANDD This instruction masks the sign bit of the BCD data if it t K7FFFFEFF is set Without this step negative values will not be correct so do not forget to include it 1 0 reads as 8000 0010 2 0 is 8000 0020 etc Put the actual signal value in V2010 Now you can use OYTD the dat Il V2010 e data normally v2001 K8000 C1 f l gt our Channel 1 data is negative when C1 is on a value of Check Channel 2 SP1 LDD Load channel 2 from V memory into the
14. efault setting is for Pt100Q RTDs This selects the DIN 43760 European platinum type RTD European curve type RTDs are calibrated to DIN 43760 BS1905 or IEC751 specifications which is 00385 O Q C 100 C 138 50 The jPt100 type for the American curve 100Q platinum RTD is more commonly used in North America The Cul0 10Q and Cu25 25Q RTD settings are used with copper RTDs V memory register MSB LSB LI LO a Input Type Selection 14 8 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input a D Units Code Register All RTD types are converted into a direct temperature reading in either Fahrenheit or Celsius The data contains one implied decimal place For example a value in V memory of 1002 would be 100 2 C or F All RTD ranges can include negative temperatures therefore the display resolution is from 3276 7 to 3276 7 Negative temperatures can be represented in either 2 s complement or magnitude plus sign form If the temperature is negative the most significant bit in the V memory location is set The 2 s complement data format may be required to correctly display bipolar data on some operator interfaces This data format could also be used to simplify averaging a bipolar signal To view this data format in DirectSoft32 select Signed Decimal The bipolar input ranges may be converted to a 15 bit magnitude
15. esignate the following addresses Ch1 V2000 2001 Ch2 V2002 2003 Ch3 V2004 2005 Ch4 V2006 2007 See note on page 14 8 OUT The octal address 02000 is stored here Special V memory location V7701 is assigned to the option slot and acts as a pointer which am means the CPU will use the octal value in this location to determine exactly where to store the incoming data LD Loads a 0 into the accumulator to set the following parameters in KO V7703 V7706 Special V memory location assigned to the option slot that specifies OUT the RTD Input Type KO selects a type Pt100 RTD V7703 See table on page 14 8 for selections Special V memory location assigned to the option slot that specifies OUT the Units Code temperature scale and data format selections V7704 KO selects a F temperature scale and magnitude plus sign bit format See truth table on page 14 9 for selections OUT Special V memory location assigned to the option slot that specifies the RTD up scale down scale burnout value KO selects an up V7706 scale burnout value of 7FFFh BCD HEX or 32 767 Binary The value is written to the channel input register when a RTD burnout occurs DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 11 Chapter 14 F0 04RTD 4 Channel RTD Input a DL05 Example 2 The example program below shows how to setup the FO 04RTD for 2 i
16. g bipolar ranges and you get a value greater than or equal to 8000h the value is negative e If you get a value less than or equal to 7FFFh the value is positive The sign bit is the most significant bit which combines 8000h to the data value If the value is greater than or equal to 8000h you only have to mask the most significant bit and the active channel bits to determine the actual data value The following two programs show how you can accomplish this The first example uses magnitude plus sign binary and the second example uses magnitude plus sign BCD Since you always want to know when a value is negative these rungs should be placed before any other operations that use the data such as math instructions scaling operations and so forth Also if you are using stage programming instructions these rungs should be in a stage that is always active Note you only need this logic for each channel that is using bipolar input signals The examples only show two channels Magnitude Plus Sign Binary Check Channel 1 SP1 LD Load channel 1 data from V memory into the V2000 accumulator Contact SP1 is always on AND This instruction masks the sign bit of the binary data if e K7FFF it is set Without this step negative values will not be correct so do not forget to include it Put the actual signal value in V2010 Now you can use out 0 th
17. he result in the accumulator V1400 is the designated workspace in this example SUBR V1400 Multiplies the real number in the accumulator by 0 2 the filter factor and stores the result in the MULR accumulator This is the filtered value The filter 2 range is 0 1 to 0 9 Smaller filter factors increases filtering 1 0 eliminates filtering Adds the real number stored in _ ADDR location V1400 to the real number V1400 filtered value in the accumulator and stores the result in the accumulator OUTD Copies the value in the accumulator to V1400 location V1400 Converts the real number in the __ RTOB accumulator to a binary value and stores the result in the accumulator Loads the binary number filtered value from OUT the accumulator into location V1402 to use in V1402 your application or PID loop 14 18 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input method in BCD format to get the analog value it must be converted to binary BIN as shown below If you NOTE Be careful not to do a multiple number conversion on a value For example if you are using the pointer are using the pointer method in Binary format the conversion to binary BIN instruction is not needed Using BCD Data Format SP1 LDD V2000 BIN BTOR SUBR V1400
18. mory location is an octal number identifying the first V memory location for the input data This V memory location is user defined but must use available consecutive V memory locations For example loading 2000 causes the pointer to write Ch 1 s data value to V2000 2001 Ch 2 s data value to V2002 2003 CH 3 s data value to V2004 2005 and Ch 4 s data value to V2006 2007 NOTE Each channel s data value occupies two 2 consecutive V memory locations This allows for more than four 4 digits to be displayed if a BCD format for channel data is selected For example 1234 5 F A binary format for either a 15 bit magnitude plus sign or 16 bit 2 s complement value will occupy the first V memory location of the two V memory locations assigned for the slected channel Refer to the specific PLC s user manual being used for available user V memory locations C RTD Type Selection Register The FO 04RTD module supports six different RTD types The type must be specified by placing a value from the table shown below into a V memory register The register is determined by the PLC type and slot number as listed in the Module Configuration Registers table on the previous page For example if using a Pt1000 RTD with a module installed in slot 2 of a DLO6 load a value of 4 into V713 All channels of the module must be the same RTD type Input Selection jPt100 American curve w TCR 00392 Pt1000 Ni120 The factory d
19. ne exactly where to store the incoming data LD Loads a constant that specifies the RTD input type K1 selects a type K1 Cu10 RTD Enter a K0 K5 to specify the RTD Input Type See table on page 14 8 for selections OUT Special V memory location assigned to option slot 2 that specifies V713 the RTD input type LD Loads a constant that specifies the Units Code temperature scale and K3 data format K3 selects C and 2 s complement data format See truth table on page 14 9 for selections OUT Special V memory location assigned to option slot 2 that specifies V714 the temperature scale and data format selections Loads a constant that specifies the RTD burnout data value at burnout LD K1 specifies a down scale value of 0000h BCD HEX or 0 Binary to K1 be written to the channel input register when a RTD burnout occurs OUT Special V memory location assigned to option slot 2 that specifies V716 the RTD up scale down scale burnout value The value is written to the channel input register when a RTD burnout occurs 14 14 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 F0 04RTD 4 Channel RTD Input ah Negative Temperature Readings with Magnitude Plus Sign With bipolar ranges you need some additional logic to determine whether the value being returned represents a positive temperature or a negative temperature There is a simple solution e If you are usin
20. ng 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 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 Unused channels require shorting wires jumpers installed from terminals CH to CH to COM e Do not 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 To remove the terminal block disconnect power to the PLC and the field devices Pull the terminal block firmly until the connector separates from the module You can remove the RTD module 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 Use the following diagram to connect the field wiring If necessary the FO O4RTD terminal block can be removed to make removal of the module possible without disturbing field wiring RTD Resistance Temperature Detector Use
21. nput channels enabled use of a type Cul0 RTD on the first 2 input channels BCD channel data format C temperature scale 2 s complement format and with a down scale burnout value specified Again place this rung in the ladder program or in the initial stage if you are using stage programming instructions SPO _ LD 4 K0200 OUT V7700 LDA 02000 OUT V7701 LD K1 OUT V7703 LD OUT V7704 LD OUT V7706 Me mA f likea LK8200 Loads a constant that specifies the number of input channels to scan and the data format The upper byte most significant nibble MSN selects the data format 0 BCD 8 binary The LSN selects the number of channels 1 2 3 or 4 The binary format is used for displaying data on some operator interface units K8200 enables 2 channels in binary format Special V memory location assigned to the option slot that specifies 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 to store the incoming data For example the 02000 entered here using the LDA instruction would designate the following addresses Ch1 V2000 2001 Ch2 V2002 2003 See note on page 14 8 The octal address 02000 is stored here Special V memory location V7701 is assigned to the option slot and acts as a
22. ogy NIST e Diagnostic features include detection of short circuits and input disconnection et n a H A firmware version 4 70 or later The DLOG 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 50 or later See our website for more information www automationdirect com 14 2 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input e Module Calibration The module automatically re calibrates every five seconds to remove any offset and gain errors The F0 04RTD module requires no user calibration However if your process requires calibration it is possible to correct the RTD tolerance using ladder logic You can subtract or add a constant to the actual reading for that particular RTD The actual reading can also be scaled to obtain the desired value using ladder logic Input Specifications The following table provide the specifications for the F0 04RTD Input Module Review these specifications to make sure the module meets your application requirements Input Specifications Number of Channels 4 Input Ranges Pt100 200 0 C to 850 0 C 328 F to 1562 F PT1000 200 0 C to 595 0 C 328 F to 1103 F jPt100 38 0 C to 450 0 C 36 F to 842 F 10 Cu 200 0 C to 260 0 C 328 F to 500 F 25Q Cu
23. rmat and with a down scale burnout value specified Use the table shown on page 14 7 to determine the pointer values if locating the module in any of the other slots V memory location V3000 is shown in the example but you can use any available user V memory location Again place this rung anywhere in the ladder program or in the initial stage if you are using stage programming instructions LD LD or K0200 k8200 Loads a constant that specifies the number of input channels to scan and the data format The upper byte most significant nibble MSN selects the data format 0 BCD 8 binary The LSN selects the number of channels 1 2 3 or 4 The binary format is used for displaying data on some operator interface units K8200 enables 2 channels in binary format OUT Special V memory location assigned to option slot 2 that specifies V710 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 to store the incoming data For example the 03000 entered here using LDA g the LDA instruction would designate the following addresses Ch1 V3000 3001 Ch2 V3002 3003 See note on page 14 8 The octal address 03000 is stored here Special V memory location OUT V711 is assigned to option slot 2 and acts as a pointer which V711 means the CPU will use the octal value in this location to determi
24. ry locations assigned to their respective option slots These V memory locations allow you to e specify the number of input channels enabled and BCD Binary data format e specify the input pointer address e specify the RTD input type e specify the units code temperature scale and data format e specify burnout data value at burnout e read module setup diagnostics Module Configuration Registers The table below shows the special V memory locations used by the DLO5 and DL06 PLCs for the FO 04RTD module Module Configuration DLO5 and DLOG Option Slot Parameters A Number of Channels Enabled Data Format B Input Pointer C RTD Type D Units Code E RTD Burnout Data Value F Diagnostic Error A Number of Channels Enabled Data Format Register This V memory location is used to define the number of input channels to be enabled and to set the channel data to BCD or binary format Number of Channel Data in Channel Data in Channels Enabled BCD Format Binary Format MSB l LSB Data Format tL Number of channels DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 14 7 Chapter 14 FO O4RTD 4 Channel RTD Input B Input Pointer Register This is a system parameter that points to a V memory location used for storing module channel input data The V memory location loaded in the input pointer V me
25. shielded RTDs whenever possible to minimize noise on the input signal Ground the shield wire at one end only preferably at the RTD source Lead Configuration for RTD Sensors The suggested three lead configuration shown below provides one lead to the CH terminal one lead to the CH terminal and one lead to the common terminal Compensation circuitry nulls out the lead length for accurate temperature measurements Some sensors have four leads When making connections do not connect the second lead to the CH input leave that lead unconnected Do not use configurations that lack the use of the same color lead to both the CH and COM terminals There is no compensation and temperature readings will be inaccurate This module has low RTD excitation current worst case dissipation with 100Q RTDs connected 15 only 0 016mW Wiring Connections For Typical RTD Sensor gt Black 8 gt To CH Black met Z To COM i Sensor i 4 Red To CH Sv Red Tee No Connection Ta applicable if sensor has 4 leads only connect one lead to CH 14 4 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11 Chapter 14 FO O4RTD 4 Channel RTD Input e Ambient Variations in Temperature The F0 04RTD module has been designed to operate within the ambient temperature range of 0 C to 60 C Precision analog measurement with no long term temperature drift is assured by a chopper stabilized programmable gain amplifier
26. th Ed Rev A 08 11 14 19 Chapter 14 FO O4RTD 4 Channel RTD Input RTD Burnout Detection Bits Special Relays Corresponding to RTD Burnouts The following Special Relay SP bits can be used in your program to monitor for RTD burnout SP bit 0 RTD OK 1 RTD burnout DLO5 and DLO6 Option Slot Module Channel Channel 1 Channel 2 Channel 3 Channel 4 14 20 DL05 06 Option Modules User Manual 7th Ed Rev A 08 11
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