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SLC™ 500 4-Channel Thermocouple/mV Input Module

1. Be 5 Terminal CJC Sensors Block Release 9 Screws 9 Tal PO Module Installation Procedure 1 Align the circuit board of the thermocouple module with the card guides located at the top and bottom of the chassis 2 Slide the module into the chassis until both top and bottom retaining clips are secured Apply firm even pressure on the module to attach it to its backplane connector Never force the module into the slot Publication 1746 UM007C EN P July 2004 Installation and Wiring 3 7 3 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 i lt pl aw N WO W Wo AN N NE SN a Top and Bottom NTE IN Module Release s NA N a di F Card Guide 5 a N Module Removal Procedure 1 Press the releases at the top and bottom of the module and slide the module out of the chassis slot 2 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Terminal Wiring The thermocouple module contains a green 18 position removable terminal block The terminal pin out is shown on page 3 8 ATTENTION Disconnect Power to the SLC before attempting to install remove or wire the removable terminal wiring block To avoid cracking the removable terminal block alternate the removal
2. Type C Temperature Range F Temperature Range J 210 to 760 346 to 1400 K 270 to 1370 454 to 2498 T 270 to 400 454 to 752 B 300 to 1820 572 to 3308 E 270 to 1000 454 to 1832 R 0 to 1768 32 to 3214 S 0 to 1768 32 to 3214 N 0 to 1300 32 to 2372 CJC Sensor 0 to 85 32 to 185 Millivolt Input Type Range 50 mV 50 mV de to 50 mV de 100 mV 100 mV de to 100 mV dc Each input channel is individually configurable for a specific input device and provides open circuit over range and under range detection and indication Publication 1746 UM007C EN P July 2004 1 2 Overview Hardware Features The thermocouple module fits into any single slot except the processor slot 0 in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis 1746 A2 It is a Class 1 module uses 8 input words and 8 output words It interfaces to thermocouple types J K T E R S B and N and supports direct 50 mV and 100 mV analog input signals The module requires the use of Block Transfer in a remote configuration The module contains a removable terminal block providing connection for four thermocouple and or analog input devices There are also two cold junction compensation CJC sensors used to compensate for offset voltages introduced into the input signal as a result of the cold junction i e w
3. Input Type With Autocalibration Without Autocalibration Maximum Error Maximum Error Temperature Drift 25 C 77 F 0 C 60 C J 1 06 C 1 91 F 0 0193 C C F F K 1 72 C 3 10 F 0 0328 C C F F T 1 43 C 2 57 F 0 0202 C C F F E 0 72 C 1 3 F 0 0190 C C F F S 3 61 C 6 5 F 0 0530 C C F F R 3 59 C 6 46 F 0 0530 C C F F B 3 12 C 5 62 F 0 0457 C C F F N 1 39 C 2 5 F 0 0260 C C F F 50 mV 50 mV 50 mV 1 0 mV C 1 8 mV F 100 mV 50 mV 50 mV 1 5 mV C 2 7 mV F 1 Assumes the module terminal block temperature is stable Input Resolution per Thermocouple Type at Each Filter Frequency C Resolution CF Type E Thermocouple 250 Hz 50 60 Hz 10 Hz 12 80 1 60 0 8 23 04 2 88 1 44 9 60 1 20 0 6 17 28 2 16 1 08 6 40 0 80 0 4 11 52 1 44 0 72 3 20 0 40 0 2 5 76 0 72 0 36 0 0 1 1 fi ji 300 150 0 150 300 450 600 750 900 1050 1200 508 238 32 302 572 842 1112 1382 1652 1922 2192 Temperature a P F Publication 1746 UM007C EN P July 2004 Specifications A 5 C Resolution F Type J Thermocouple 250 Hz 50 60 Hz 10 Hz 3 20 0 40 0 20 5 76 0 72 0 36 2 40 0 30 0 15 4 32 0 54 0 27 1 60 0
4. Rung 2 0 First Pass Bit Initialize NT4 S 1 COP j COPY FILE 15 Source N10 0 Dest 0 3 0 Length 4 Rung 2 1 Channel 0 Channel 0 Channel 0 Status Open Alarm I 3 4 1 3 4 0 2 0 1 o 1 E 11 12 0 Rung 2 2 Channel 1 Channel 1 Channel 1 Status Open Alarm 1235 13 5 0 2 0 Iof Hl Ir 12 1 Rung 2 3 Channel 2 Channel 2 Channel 2 Status Open Alarm 1 3 6 1 3 6 0 2 0 1 f f 11 12 2 Rung 2 4 Channel 3 Channel 3 Channel 3 Status Open Alarm 1 3 7 1337 0 2 0 1 t 1 Ir 12 3 Rung 2 5 END Data Table 15 data 0 address 15 data 0 0000 1001 0001 0001 N10 3 0000 1001 0001 0001 N10 1 N10 2 Publication 1746 UM007C EN P July 2004 0000 1001 0001 0001 0000 1001 0001 0001 Ladder Programming Examples 6 7 Invoking Autocalibration Autocalibration of a channel occurs whenever a channel is enabled or when a change is made to its input type or filter frequency You can also command your module to perform an autocalibration cycle by disabling a channel waiting for the status bit to change state 1 to 0 and then re enabling that channel Several channel cycles are required to perform an autocalibration IMPORTANT During autocalibration the module is not converting input data To maintain system accuracy we recommend that you periodically perform an autocalibration cycle for example e whenever an event occurs that greatly changes the internal temperature of the control cabinet such as opening or
5. ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type S and R commercial thermocouples be 1 4C between 0 and 538C and 1 4 percent between 538 and 1482C Limits of error are not specified for Type S or R thermocouples below OC The recommended upper temperature limit for continuous use of protected thermocouples 1482C applies to AWG 24 0 5 mm wire Appendix D Thermocouple Types This appendix describes the three types of thermocouple junctions They are e Grounded Junction The measuring junction is physically connected to the protective metal sheath providing electrical continuity between junction and sheath e Ungrounded Junction The measuring junction is electrically isolated from the protective metal sheath Also called Insulated Junction e Exposed Junction Does not have a protective metal sheath so the measuring junction is exposed The illustration that follows shows each of the 3 thermocouple types Grounded Junction Measuring Junction is Metal Sheath connected to sheath Extension N Ungrounded Insulated Junction Measuring Junction is isolated from sheath _ i Exposed Junction Measuring Junction has no sheath aS a Publication 1746 UM007C EN P July 2004 D 2 Thermocouple Types Publication 1746 UM007C EN P July 2004 Appendix E Configurin
6. Filter 50Hz NMR 60HzNMR Cut Off Step Frequency Frequency Response 10 Hz 100 dB 100 dB 2 62 Hz 300 msec 50 Hz 100 dB 13 1 Hz 60 msec 60 Hz 100 dB 15 72 Hz 50 msec 250 Hz 65 5 Hz 12 msec Effective Resolution The effective resolution for an input channel depends upon the filter frequency selected for that channel Graphs that shows actual bit resolution for the thermocouple types at all filter frequencies are provided in Appendix A Preliminary Operating Considerations 4 5 Channel Cut Off Frequency The channel filter frequency selection determines a channel s cut off frequency also called the 3 dB frequency The cut off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation All frequency components at or below the cut off frequency are passed by the digital filter with less than 3 dB of attenuation All frequency components above the cut off frequency are increasingly attenuated as show in the graphs starting below The cut off frequency for each input channel is defined by its filter frequency selection The table on the previous page lists the input channel cut off frequency for each filter frequency Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency The cut off frequency should not be confused with update time The cut off frequen
7. Allen Bradley SLCO 500 4 Channel Thermocouple mV Input Module Catalog Number 1746 NT4 Series B User Manual e ee oe ee ey m e Em Rockwell Automation Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment Safety Guidelines for the Application Installation and Maintenance of Solid State Controls Publication SGI 1 1 available from your local Rockwell Automation sales office or online at http www ab com manuals gi describes some important differences between solid state equipment and hard wired electromechanical devices Because of this difference and also because of the wide variety of uses for solid state equipment all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable In no event will Rockwell Automation Inc be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment The examples and diagrams in this manual are included solely for illustrative purposes Because of the many variables and requirements associated with any particular installation Rockwell Automation Inc cannot assume responsibility or liability for actual use based on the examples and diagrams No patent liability is assumed by Rockwell Automation Inc with respect to use of information circuits equipment or
8. e 60 Hz input filter to provide 60 Hz line noise rejection Configuration setup for bath thermocouple e channel 1 e type J thermocouple e display temperature to tenths of a degree e zero data word in the event of an open circuit e 60 Hz input filter to provide 60 Hz line noise rejection Configuration setup for steam thermocouple e channel 2 e type K thermocouple e display temperature to tenths of a degree e zero data word in the event of an open circuit e 60 Hz input filter to provide 60 Hz line noise rejection Configuration setup for chilled HzO thermocouple e channel 3 e type J thermocouple e display temperature to tenths of a degree e zero data word in the event of an open circuit e 60 Hz input filter to provide 60 Hz line noise rejection Configuration setup for cabinet temperature e channel 0 e CJC temperature e display temperature to tenths of a degree e zero data word in the event of an open circuit e 60 Hz input filter to provide 60 Hz line noise rejection Publication 1746 UM007C EN P July 2004 8 6 Application Examples Channel Configuration Worksheet With Settings Established VAB IY 1 10 9 8 7 6 5 3 2 100 Bit Number 0 0 0 0 1 1 0 x 0 0 0 0 0 1 0 Channel 0 Ambient 0 0 0 0 1 1 0 x 0 0 0 0 0 0 0 Channel 1 Bath 0
9. 0000005 A 2 TAU SPSCHICAONS pct tek hye tae ba i anes A 3 1746 NT4 Module Accuracy 0 0 eee A 4 Input Resolution per Thermocouple Type at Each Filter NR Be ot sche ere ee te A 4 Appendix B Channel Configuration Procedure 4 B 1 Channel Configuration Worksheet B 4 Appendix C J Type Thermocouple an sind toe Rata Aad Shy ORS C 1 ron vs Copper Nickel lt Constantan gt C 1 K Type Thermocouple 4 30 45 a uc detonate 2 a eqn HR He 4 C 2 NIckel Chromium vs Nickel Aluminum C 2 Type TBE TNOCOMPI Ca iach aban ree ATE a ee C 3 Publication 1746 UM007C EN P July 2004 Table of Contents iv Thermocouple Types Configuring the 1746 NT4 Module with RSLogix 500 Publication 1746 UM007C EN P July 2004 Copper vs Copper Nickel lt Constantan gt E Type Thermocouple ado ee ee Rds hae ees Nickel Chromium vs Copper Nickel lt Constantan gt S and R Type Thermocouples a viipcaig Pas FoR HOH Kes S Platinum 10 Rhodium vs Platinum R Platinum 13 Rhodium vs Platinum Appendix D Appendix E Glossary Index Who Should Use this Manual Purpose of this Manual Preface Read this preface to familiarize yourself with the rest of the manual The preface includes e Who Should Use this Manual e Purpose of this Manual e Common Techniques Used in this Manual Use this manual if you are responsible for designing installing
10. 760 C 210 C x 3421 16384 7 46 C Engineering Units to Scaled for PID Equation Scaled for PID Equivalent 16384 x Engineering Units desired SLOW SHIGH SLOW e Assume type J input type scaled for PID display type desired channel temp 344 C e Want to calculate Scaled for PID equivalent e From Channel Data Word Format table Sow 210 C and SHIGH 760 C Solution Scaled for PID Equivalent 16384 x 344 C 210 C 760 C 210 C 9357 Publication 1746 UM007C EN P July 2004 5 8 Channel Configuration Data and Status Proportional Counts to Engineering Units Equation Engr Units Equivalent Sow SyiGH SLOW x Proportional Counts value displayed 32768 65536 e Assume type E input type proportional counts display type channel data 21567 e Want to calculate F equivalent e From Channel Data Word Format table Sow 454 F and SHIGH 1832 F Solution Engr Units Equivalent 454 F 1832 F 454 F x 21567 32768 65536 1441 3 F Engineering Units to Proportional Counts Equation Proportional Counts Equivalent 65536 x Engineering Units desired Stow CSyHiGH SLOW 1 32768 e Assume type E input type proportional counts display type desired channel temp 1000 F e Want to calculate Proportional Counts equivalent e From Channel Data Word Format table Sow 454 F and S
11. Greater than 150 dB at 50 Hz 10 Hz 50 Hz filter frequencies Greater than 150 dB at 60 Hz 10 Hz 60 Hz filter frequencies Input Filter Cut Off Frequencies 2 62 Hz at 10 Hz filter frequency 13 1 Hz at 50 Hz filter frequency 15 72 Hz at 60 Hz filter frequency 65 5 Hz at 250 Hz filter frequency Calibration Module autocalibrates at power up and whenever a channel is enabled Isolation 500V de continuous between inputs and chassis ground and between inputs and backplane Maximum Series B or later 2V maximum between any two channels Channel to Channel Common Mode Separation Series A OV separation Publication 1746 UM007C EN P July 2004 A 2 Specifications Physical Specifications Environmental Specifications Publication 1746 UM007C EN P July 2004 Specification Value LED Indicators 5 green status indicators one for each of 4 channels and one for module status Module ID Code 3510 Recommended Cable For Thermocouple inputs Appropriate shielded twisted pair thermocouple extension wirel For mV inputs Belden 8761 or equivalent Maximum Wire Size Two 14 AWG wires per terminal Maximum Cable Impedance 25 ohms maximum loop impedance for lt 1LSB error Terminal Block Removable Allen Bradley spare part Catalog Number 1746 RT32 1 Refer to the thermocouple manufacturer for the correct extension wire Specification Value Operating Temperature 0 C to
12. ___ Module Circuitry A 7 CJCA S tk ensor ee i Open Circuit i Detection i E C Channel 0 tS b 7 Sk o S T ungrounded l HS i thermocouple i V y User Selected Filter Frequency Channel 1 T is i l A i 1 SJ 1 i i within grounded On y Analog to a Tan 2V thermocouple i V Digital Digital Digital Multiplexer Convertor Filter Value y Channel 2 n tS l T l Q 7 Shield within grounded 1 Ov MN thermocouple i v y Channel 3 l te wt See Important note below 1 Q 7 Shield 1 grounded ot thermocouple i ome i user supplied Analog jumper Gommon i 1S 7 CJCB Sensor r T 477 i maea Vhen using multiple grounded and or exposed thermocouples that are touching on electrically conductive material with Series B or higher 1746 NT4 the ground potential between any two channels cannot exceed 2 volts Publication 1746 UM007C EN P July 2004 Overview 1 7 ATTENTION The possibility exists that grounded or exposed thermocouples can become shorted to a potential greater than that of the thermocouple itself Due to possible shock hazard care should be taken when wiring these types of thermocouples Refer to Appendix D for more details Linear Millivolt Device Compatibility A large number of millivolt devices may be used with the 1746 NT4 module For this reason we do not specify compatibility
13. 302 572 842 1112 1382 1652 Temperature CF 1922 2192 2462 2732 3002 3272 Specifications A 7 Resolution CC F 250Hz 50 60Hz 10Hz Type S Thermocouple 6 79 1 20 0 6 12 22 2 16 1 08 4 53 0 80 0 4 8 15 1 44 0 72 2 26 0 40 0 2 4 07 0 72 0 36 0 0 ji L L L 1 1 L fi L L L fi L 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 508 238 32 302 572 842 1112 1382 1652 1922 2192 2462 2732 3002 3272 G Temperature C Resolution FR Type T Thermocouple 250 Hz 50 60 Hz 10 Hz 9 05 1 60 0 8 16 29 2 88 1 44 6 79 1 20 0 6 12 22 2 16 1 08 4 53 0 80 0 4 8 15 1 44 0 72 2 26 0 40 0 2 4 07 0 72 0 36 0 0 1 300 150 0 150 300 450 600 508 238 32 302 572 842 1112 C Temperature s F Publication 1746 UM007C EN P July 2004 A 8 Specifications Resolution 10 F Type B Thermocouple 250 Hz 50 60 Hz 10 Hz 3 20 0 80 0 4 5 76 1 44 0 72 2 40 0 60 0 3 4 32 1 08 0 54 1 60 0 40 0 2 2 88 0 72 0 36 0 80 0 20 0 1 1 44 0 36 0 18 0 0 fi fi L L fi L fi L fi fi 1 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 1950 508 238 32 302 572 842 1112 1382 1652 1922 2192 2462 2732 3002 3272 3542 C Temperature 57 F Publication 1746 UM007C EN P July 2004 Chan
14. 5 2 6 1 and Appendix E Maintaining the ambient temperature surrounding the SLC A 2 500 above 3 C 37 4 F Publication 1746 UM007C EN P July 2004 2 Summary of Changes Publication 1746 UM007C EN P July 2004 Overview Quick Start for Experienced Users Installation and Wiring Preliminary Operating Considerations Table of Contents Preface Who Should Use this Manual P 1 Purpose of this Manual st 30 g ra a alin GR ap ees P 1 Related Documentation 2 kra pr 0 Hk TD Heer P 2 Your Questions or Comments on this Manual P 3 Common Techniques Used in this Manual P 3 Chapter 1 General Description nosa sr Teh eee eS ks 1 1 Hardware Features 0 0 0 cc eee 1 2 General Diagnostic Features 00005 1 3 System Overview soens ane DE Eea a eee 1 3 System Operation gf nanoa aaa 1 4 Module Operation a satis de Boy oa low hind an 1 5 Thermocouple Compatibility ai sca eee so ei ees 1 5 Linear Millivolt Device Compatibility 1 7 Chapter 2 Required Tools and Equipment 4 2 1 Installation Procedures 2 lr dad vo Rated va dad 2 2 Chapter 3 Compliance to European Union Directives 3 1 EMG Directive si Baha ee pe al be Ose Boe 3 1 Electrostatic Discharges 0 wo Galassi edad ah aby age OUR 3 2 NT4 Power Requirements ri 3 2 Module Location in Chassis 0 46404 ce are bd eds 4 3 3 Fixed Expansion Chassis
15. Engineering Units 10 Zero If Open Circuit Fahrenheit 10 Hz Filter Frequency Channel Enable Bit Not Used This example transfers configuration data and sets the channel enable bits of all four channels with a single File Copy instruction Procedure 1 Create integer file N10 Integer file N10 should contain four elements N10 0 through N10 3 Publication 1746 UM007C EN P July 2004 Enter the configuration parameters for all four thermocouple channels into a source integer data file N10 See Appendix B for a channel configuration worksheet Program a rung in your ladder logic to copy the contents of integer file N10 to the four consecutive output words of the thermocouple module beginning with O 3 0 First Pass Bit Initialize NT4 S 1 COE COPY FILE 15 Source N10 0 Dest 0 3 0 Length 4 On power up bit S 1 15 is set for th is sent to the NT4 channel configuration words e first program scan and integer file N10 Ladder Programming Examples 6 3 Dynamic Programming address N10 0 N10 1 N10 2 Rung 2 0 Rung 2 1 Rung 2 2 Rung 2 3 I5 The following example explains how to change data in the channel configuration word when the channel is currently enabled Example Execute a dynamic configuration change to channel 2 of the thermocouple module located in slot 3 of a 1746 chassis Change from monitoring an external type K thermocouple to monitoring the CJC sensors mounted on the
16. Set bit 8 for temperature celsius or fahrenheit Filter Frequency Sets bits 9 10 and determines the frequency of the channel filter Broken Input Sets bits 6 7 and determines how to handle an open circuit condition Data Format Sets bits 4 5 and determines the scale of the data Publication 1746 UM007C EN P July 2004 E 4 Configuring the 1746 NT4 Module with RSLogix 500 5 Press OK to set the parameters The following dialog box appears Configuration Rung and Data x Integer Data File Number 3 Integer Data Element jo dl Rung to be inserted IC 2 1 15 COP N3 0 00 1 0 4 At Program File Number 2 Top v 6 Choose the data file for the configuration and the location for the configuration rung within your ladder logic program 7 Press OK The following rung is added to the ladder logic program Initialization for Slot 2 1746 HT4 Analog 4 Ch Thermocouple Input First Fass OP 51 0000 J 15 Publication 1746 UM007C EN P July 2004 Copy File Source anon Dest 020 Length 4 This rung will send the configuration to the module on the first program scan The source and destination of the COP instruction may change depending on what you entered in the channel tab and the module location Glossary The following terms and abbreviations are used throughout this manual For definitions of terms not listed here refer to Allen Bradley s Industrial Automa
17. e A thermocouple wire may be loose or cut e The thermocouple may not have been installed on the configured channel e The CJC may be damaged If a damaged CJC termination is the cause of the detected open circuit condition the status LED for each channel configured for thermocouple or CJC input blinks If an open circuit is detected the channel data word reflects input data as defined by the open circuit bits 6 and 7 in the channel configuration word Module Diagnostics and Troubleshooting 7 5 Out Of Range Detection Whenever the data received at the channel data word is out of the defined operating range an over range or under range error is indicated and bit 13 under range or 14 over range of the channel status word is set Refer to the temperature ranges provided in the table on page 5 9 for a review of the temperature range limitations for your input device Possible causes of an out of range condition include e The temperature is too hot or too cold for the thermocouple being used e A type B thermocouple may be registering a F value in engineering units x 1 that cannot be expressed by the data bits Refer to page 5 11 for more information e A CJC may be damaged or the temperature within the cabinet containing the module may be outside the CJC range limits Module Status LED Green The module status LED is used to indicate module related diagnostic or operating errors These non recoverable errors may
18. thermocouple and extension wire Refer to Appendix C for more details The Series B or higher 1746 NT4 differential design allows for a maximum channel to channel common mode voltage difference separation of 2 volts This means that if you are using an NT4 with multiple grounded thermocouples with metallic sheaths or exposed thermocouples with measuring junctions that make contact with electrically conductive material their ground potentials must be within 2 volts If this is not done your temperature readings will be inaccurate or the module could be damaged If your grounded thermocouple protective sheath is made of an electrically non conductive material such as ceramic then the voltage separation specification is not as important Refer to Appendix D for an explanation of grounded ungrounded and exposed thermocouples Use the analog common ANALOG COM terminal for applications that have multiple grounded thermocouples This analog common terminal must be jumpered to either the or terminal of any active channel which is connected to a grounded thermocouple See Wiring Considerations on page 3 8 for complete information on the use of the ANALOG COM terminal Publication 1746 UM007C EN P July 2004 1 6 Overview Input Circuit Block Diagram Input Circuit Block Diagram Chassis Ground internally connected TerminalBlock
19. 0111 N 4 and 5 Data Format Select 00 engineering units x1 0 1 step 10 scaled for PID 0 to 16383 0 01 mV step 11 proportional counts 32768 to 32767 01 engineering units x10 1 step 0 1 mV step 6 and 7 Open Circuit Select 00 zero 01 upscale 10 downscale 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz 11 Channel Enable 0 channel disabled 1 channel enabled 12 15 Not Used 0000 always make this setting Publication 1746 UM007C EN P July 2004 Application Examples 8 3 Program Listing Rung 2 0 Initialize Channel 0 of NT4 First Pass Bit S 1 MOV 1 MOVE 15 Source N10 0 Dest 0 3 0 Rung 2 1 Convert the channel 0 data word degrees F to BCD and write this to the LED display If channel 0 is ever disabled a zero is written to the display TOD TO BCD Source 1 3 0 Dest N7 0 MVM MASKED MOVE Source N7 0 Mask OFFF Dest 0 2 0 Rung 2 2 JEND The use of the masked move instruction with the OFFF mask allows you to use outputs 12 13 14 and 15 for other output devices in your system The 7 segment display uses outputs 0 11 Data Table address 15 data 0 address I5 data 0 N10 0 0000 1001 0001 0000 Publication 1746 UM007C EN P July 2004 8 4 Application Examples Supplementary Example SLC 5 02 174
20. 1 Status Word manual C C annel 3 Status Word Publication 1746 UM007C EN P July 2004 Quick Start for Experienced Users 2 7 a Go through the system start up proceedure Reference Apply power Download your program to the SLC and put the controller into Run mode In this Chapter 7 example during a normal start up the module status LED and channel status 0 LED turn on Module Diagnostics and Troubleshooting INPUT CHANNEL 0 2 Channel LEDs STATUS 1113 MODULE STATUS lt Module Status LED THERMOCOUPLE mV 10 Check module operation Reference Optional Monitor the status of input channel 0 to determine its configuration setting and Chapter 5 operational status This is useful for troubleshooting when the blinking channel LED indicates Channel l that an error has occurred If the Module Status LED is off or if the Channel 0 LED is off or Configuration blinking refer to chapter 7 Data and Status Chapter 6 Ladder Programming Examples Chapter 8 Application Examples SLC 500 Controller es Data Files io Input Image 8 words Output Image 5 5 g S 2 2 Word 0 Channel 0 Data Word T glaas S S S 5 gel S p Word 1 Channel 1 Data Word s sel 3 3 3 D e as a5 2 oj 5 2 Word 2 Channel 2 Data Wo
21. 12 channel status bit 5 16 Channel Status Checking 5 13 chassis definition G 1 CJC 3 12 definition G 1 CMRR definition G 1 cold junction compensation 3 12 definition G 1 common mode rejection ratio definition G 1 common mode voltage definition G 1 common techniques used in this manual P 3 compatibility with SLC controllers 1 5 with thermocouple extension wire 1 5 with thermocouple sensors 1 5 configuration word definition G 1 factory default setting 5 1 output image 4 2 Index configuring NT4 module with RSLogix E 1 connection diagram 3 7 current draw 3 2 cut off frequency definition G 1 overview 4 5 D data word definition G 2 overview 4 3 resolution 5 9 data word format examining in status word 5 15 overview 5 5 scaling ranges by input type 5 9 setting in configuration word 5 5 dB definition G 1 decibel definition G 1 default setting of configuration word 5 1 definition of terms G 1 differential mode rejection definition G 2 differential mode rejection See normal mode rejection digital filter definition G 2 disabling a channel 5 12 door label 1 3 E effective resolution definition G 2 electrical noise 3 5 3 8 enabling a channel 5 12 engineering units input 5 5 equipment required for installation 2 1 errors detecting channel related errors 7 4 over range error 7 5 examples basic application example 8 1 how to address configuration word 4 2 how to address data word 4 3 how to
22. 20 0 10 2 88 0 36 0 18 0 80 0 10 0 05 1 44 0 18 0 09 0 00 1 300 150 0 150 300 490 600 750 900 508 238 32 302 572 842 1112 1382 1652 Temperature a Resoluti LG SI F Type K Thermocouple 250 Hz 50 60 Hz 10 Hz 12 80 1 60 0 8 23 04 2 88 1 44 9 60 1 20 0 6 17 28 2 16 1 08 6 40 0 80 0 4 11 52 1 44 0 72 3 20 0 40 0 2 5 76 0 72 0 36 0 0 L L i 1 i 1 1 L i i 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 508 238 32 302 572 842 1112 1382 1652 1922 2192 2462 2732 Temperature F Publication 1746 UM007C EN P July 2004 A 6 Specifications Resolution wel F 250 Hz 50 60 Hz 10Hz 1 60 0 20 0 10 2 88 0 36 0 18 1 28 0 16 0 08 2 30 0 29 0 14 0 96 0 12 0 06 13 0 22 0 11 0 64 0 08 0 04 1 15 0 14 0 07 0 32 0 04 0 02 0 58 0 07 0 04 0 00 Resolution 10 CF 250 Hz 50 60 Hz 10Hz Type N Thermocouple 300 1590 0 150 300 490 60 750 900 1050 1200 1350 1500 6 79 1 20 0 6 12 22 2 16 1 08 4 53 0 80 0 4 8 15 1 44 0 72 2 26 0 40 0 2 4 07 0 72 0 36 0 0 Publication 1746 UM007C EN P July 2004 508 238 32 302 Type R Thermocouple 572 842 Temperature 11 0 2 1382 CC F 1652 1922 2192 2462 2732 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 608 238 32
23. 4 Channel Thermocouple mV 1746 IN010 Thermocouple mV input module Module Installation Instructions Information on reducing electrical noise System Design for Control of Electrical GMC RM001 Noise In depth information on grounding and wiring Allen Bradley Allen Bradley Programmable Controller 1770 4 1 programmable controllers Grounding and Wiring Guidelines A description of important differences between solid state Application Considerations for Solid State SGI 1 1 programmable controller products and hard wired electromechanical Controls devices An article on wire sizes and types for grounding electrical National Electrical Code Published by the National Fire Protection equipment Association of Boston MA A glossary of industrial automation terms and abbreviations Allen Bradley Industrial Automation AG 7 1 Glossary Publication 1746 UM007C EN P July 2004 Preface 3 If you would like a manual you can e download an electronic version from the internet at www theautomationbookstore com http www ab com manuals e order a printed manual by contacting your local distributor or Rockwell Automation representative visiting www theautomationbookstore com calling 1 800 963 9548 USA Canada or 001 330 725 1574 Outside USA Canada Your Questions or Comments on this Manual If you find a problem with this manual or you have any suggestions for how this manual could be made more useful to you
24. 8 of the configuration word If the channel is configured for a mV analog sensor enter a zero in bit 8 5 Determine the desired input filter frequency for the channel and enter the 2 digit binary code in bit field 9 10 of the channel configuration word A lower filter frequency increases the channel update time but also increases the noise rejection and channel resolution A higher filter frequency decreases the channel update time but also decreases the noise rejection and effective resolution 6 Determine which channels are used in your program and enable them Place a one in bit 11 if the channel is to be enabled Place a zero in bit 11 if the channel is to be disabled 7 Ensure that bits 12 15 contain zeros Publication 1746 UM007C EN P July 2004 Channel Configuration Data and Status 5 3 8 Build the channel configuration word for every channel on each thermocouple mV module repeating the procedures given in steps 1 7 9 Following the steps outlined in chapter 2 Quick Start for Experienced Users or in chapter 6 Ladder Programming Examples enter this configuration data into your ladder program and copy it to the thermocouple module Publication 1746 UM007C EN P July 2004 5 4 Channel Configuration Data and Status Bit s Define To Select Make these bit settings in the Channel Configuration Word 15 14 13 12 11 10 9 1 6 5 4 0 3 Input type Thermocoupl
25. Considerations 3 3 General Considerations aij wee pote aos s ca kek 3 5 Module Installation and Removal 005 3 5 Terminal Block Removal 4 00 44 a a amp doen nko oe 44 3 6 Module Installation Procedure 3 6 Module Removal Procedure v5 454 Sead Bea YO ye eae 3 7 Terminal Wiin 0 aces ane pig bam Bac at ee eae h 3 7 Wiring Considerations oui a aasa 3 8 Wiring Input Devices to the NT4 3 11 Cold Junction Compensation CJC 3 12 Thermocouple Calibration 24 6424 24 b66 4 seo ooh eds 3 13 Chapter 4 Module ID COS si s a Reto krona o 4 1 Module ACCESSING a tke Ren SOON Ped 4 2 Output Image Configuration Words 4 2 Input Image Data Words and Status Words 4 3 Channel Filter Frequency Selechion 422 hani 4 4 Publication 1746 UM007C EN P July 2004 Table of Contents ii Channel Configuration Data and Status Ladder Programming Examples Publication 1746 UM007C EN P July 2004 Effective Resolution n on ass ages E25 eee eae Channel Cut Off Frequency i e Sate ae ties Channel Step Response 4c x dad Rew ata ck da Update Timessa aay OK ee Oe Dan ee Ra OK eed Update Time Calculation Example Channel Turn On Turn Off and Reconfiguration Times Response to Slot Disabling oes Hees ke Input RESPONSE peeps ee geri pona ae Peg Pease we gaat Output Responses 4 reise a ae eed ee Fe Chapte
26. Ghassis Place your thermocouple module in any slot of an SLC 500 modular or modular expansion chassis except for the extreme left slot slot 0 in the first chassis This slot is reserved for the processor or adapter Fixed Expansion Chassis Considerations Tithe The 2 slot SLC 500 fixed I O expansion chassis 1746 A2 will support only specific combinations of modules If you are using the thermocouple module in a 2 slot expansion chassis with another SLC I O or communication module refer to the table starting below to determine whether the combination can be supported In the table e AN x indicates a valid combination e No symbol indicates an invalid combination e A indicates an external power supply refer to the SLC 500 4 Channel Analog I O Modules User Manual publication 1746 UM005 for more information When using the table be aware that there are certain conditions that affect the compatibility characteristics of the BASIC module BAS and the DH 485 RS 232C module CKE When you use the BAS module or the KE module to supply power to a 1747 AIC Link Coupler the Link Coupler draws its power through the module The higher current drawn by the AIC at 24 VDC is calculated and recorded in the table for the modules identified as BASn BAS networked or KEn KE networked Make sure to refer to these modules if your application uses the BAS or KE module in this way 1746 N4 5VdcAmps 2WdcAms lA4 X
27. and the input 6 Repeat steps 1 through 6 for each channel on the NT4 module Publication 1746 UM007C EN P July 2004 3 12 Installation and Wiring Publication 1746 UM007C EN P July 2004 Cold Junction Compensation CJC ATTENTION Do not remove or loosen the cold junction compensating thermistor assemblies located between the two upper and lower CJC terminals on the terminal block Both thermistor assemblies are critical to ensure accurate thermocouple input readings at each channel The module will not operate in the thermocouple mode if either assembly is removed To obtain accurate readings from each of the channels the cold junction temperature temperature at the module s terminal junction between the thermocouple wire and the input channel must be compensated for Two cold junction compensating thermistors have been integrated in the removable terminal block they must remain installed to retain accuracy In case of accidental removal of either or both of the thermistor assemblies make sure to replace them by connecting each one across the CJC terminals located at the top and bottom left side of the terminal block When connecting the thermistor assembly at the top of the terminal block between terminals CJC A and CJC A the lug containing the thermistor marked with red epoxy should attach to the uppermost screw terminal CJC At When connecting the thermistor assembly at the bottom of the terminal bl
28. closing its door e at a convenient time when the system is not making product such as during a shift change Several channel cycles are required to perform an autocalibration and it is important to remember that during autocalibration the module is not converting input data Publication 1746 UM007C EN P July 2004 6 8 Ladder Programming Examples Example Command the NT4 to perform an autocalibration of channel 0 The NT4 is in slot 3 Program Listing Rung 2 0 Condition for Channel 0 Enable Autocalibration I 1 B3 0 3 0 1 OSR U 0 0 11 Channel 0 Flag B3 L 1 Rung 2 0 Channel 0 Status Channel 0 Flag Channel 0 Enable I 3 4 B3 0 3 0 1 t 1 L 11 I 11 Channel 0 Flag B3 U 1 Ti The NT4 responds to processor commands much more frequently than it updates its own LEDs Therefore it is normal to execute these two rungs and have the NT4 perform an autocalibraion of channel 0 without the channel 0 LED ever changing state Publication 1746 UM007C EN P July 2004 Module Operation vs Channel Operation Power up Diagnostics Chapter 7 Module Diagnostics and Troubleshooting This chapter describes troubleshooting using the channel status LEDs as well as the module status LED It explains the types of conditions that might cause an error to be reported and gives suggestions on how to resolve the problem This chapter includes e Module Operation vs Channel Operatio
29. configuration word the change must be reflected in the status word before new data is valid Refer to Channel Status on page 5 13 While the channel enable bit is cleared 0 the channel data word and status word values are cleared After the channel enable bit is set the channel data word and status word remain cleared until the thermocouple module sets the channel status bit bit 11 in the channel status word Unused Bits Bits 12 15 Bits 12 15 are not defined Ensure these bits are always cleared 0 The actual thermocouple or millivolt input data values reside in I e 0 through I e 3 of the thermocouple module input image file The values present will depend on the input type and data formats you have selected When an input channel is disabled its data word is reset 0 Publication 1746 UM007C EN P July 2004 4 CIII ass TT o ILII ss EEE T a CILIT C te ET a CLL LL TL s ngs LL LL 5 14 3 12 11 10 9 8 7 6 5 4 3 2 1 0 Channel Configuration Data and Status 5 13 Channel Status Checking Module Input Image Status Word ea LJ 1 7 15 14 1 4 3 2 1 0 es TITT The channel status word is a part of the thermocouple module s input image Input words 4 7 correspond to and contain the configuration status of thermocouple channels 0 1 2 and 3 respectively You can use the data provided in the status word to determine if the input configuration data for any channel is valid per
30. mV 0 0 100 mV 0 0 Invalid 0 Invalid 1 0 0 Invalid 1 0 Invalid 1 0 Invalid 1 CJC temperature 4and5 Data type 1 0 0 Engineering units x 19 0 1 Engineering units x 102 1 0 Scaled for PID 1 1 Proportional Counts 6 and 7 Open circuit type 0 0 Zero 0 1 Upscale 1 0 Downscale 1 1 nvalid 8 Temperature units 0 Degrees C type 1 Degrees F 9 and 10 Channel filter 0 0 10 Hz frequency 0 1 50 Hz 1 0 60 Hz 1 1 250 Hz 1 Channel status 0 Channel Disabled 1 Channel Enabled 2 Open circuit error 0 No error 1 Open circuit detected 3 Under range error 0 No error 1 Under range condition 4 Over range error 0 No error 1 Over range condition 5 Configuration error 0 No error 1 Configuration error 1 When millivolt input type is selected the bit setting for temperature units is ignored 2 For engineering units x1 values are expressed in 0 1 degrees or 0 01 mV For engineering units x10 values are expressed in 1 0 degrees or 0 1 mV Publication 1746 UMO007C EN P July 2004 Status Conditions Channel Configuration Data and Status 5 15 TTT the channel for which you are seeking status is disabled bit O e x 11 0 all bit fields are cleared The status word for any disabled channel is always 0000 0000 0000 00
31. may be in error Publication 1746 UM007C EN P July 2004 5 18 Channel Configuration Data and Status Publication 1746 UM007C EN P July 2004 Initial Programming Chapter 6 Ladder Programming Examples Earlier chapters explained how the configuration word defines the way a channel operates This chapter shows the programming required to enter the configuration word into the processor memory It also provides you with segments of ladder logic specific to unique situations that might apply to your programming requirements This chapter includes e Initial Programming e Dynamic Programming e Verifying Channel Configuration Changes e Interfacing to the PID Instruction e Monitoring Channel Status Bits e Invoking Auto calibration To enter data into the channel configuration word O e 0 through O e 3 when the channel is disabled bit 11 0 follow the steps on page 6 2 for specific configuration details TIP When using RSLogix 500 version 6 10 or higher you can use the software s I O wizard to configure the NT4 channels Publication 1746 UM007C EN P July 2004 6 2 Ladder Programming Examples Example Configure four channels of a thermocouple module residing in slot 3 of a 1746 chassis Configure each channel with the same parameters o o 1 o 1 o o Bit Number Bit Setting Configures Channel For Type K Thermocouple Input
32. please contact us at the address below Rockwell Automation Automation Control and Information Group Technical Communication Dept A602V P O Box 2086 Milwaukee WI 53201 2086 Common Techniques Used The following conventions are used throughout this manual in this Manual e Bulleted lists such as this one provide information not procedural steps e Numbered lists provide sequential steps or hierarchical information e Italic type is used for emphasis Publication 1746 UM007C EN P July 2004 4 Preface Publication 1746 UM007C EN P July 2004 General Description Chapter 1 Overview This chapter describes the thermocouple millivolt module and explains how the SLC controller gathers thermocouple or millivolt initiated analog input from the module This chapter includes e General Description e System Overview The thermocouple mV module receives and stores digitally converted thermocouple and or millivolt mV analog data into its image table for retrieval by all fixed and modular SLC 500 processors The module supports connections from any combination of up to four thermocouple or mV analog sensors The following tables define thermocouple types and their associated full scale temperature ranges and also list the millivolt analog input signal ranges that each 1746 NT4 channel will support To determine the practical temperature range your thermocouple supports refer to the specifications in Appendix A
33. programming or troubleshooting control systems that use SLC 500 4 Channel Thermocouple mV Input Module You should have a basic understanding of electrical circuitry and familiarity with relay logic If you do not obtain the proper training before using this product This manual describes the procedures you use to install wire and troubleshoot your 4 channel thermocouple mV module This manual e explains how to install and wire your module e gives you an overview of the SLC 500 programmable controller system Refer to your programming software user documentation for more information on programming your SLC 500 programmable controller Publication 1746 UM007C EN P July 2004 2 Preface Related Documentation The following documents contain additional information concerning Rockwell Automation products To obtain a copy contact your local Rockwell Automation otfice or distributor For Read this Document Document Number In depth information on the SLC Instruction Set SLC 500 Instruction Set Reference Manual 1747 RMO001 A description on how to install and use your Modular SLC 500 SLC 500 Modular Hardware Style User 1747 UM011 programmable controller Manual A description on how to install and use your Fixed SLC 500 Installation amp Operation Manual for Fixed 1747 6 21 programmable controller Hardware Style Programmable Controllers A description on how to install the SLC 500 4 Channel SLC 500
34. reading below 760C are desired at a later time The negative thermoelement a copper nickel alloy is subject to substantial composition changes under thermal neutron irradiation since copper is converted to nickel and zinc Commercial iron undergoes a magnetic transformation near 769C and lt an alpha gamma gt crystal transformation near 910C Both of these transformation especially the latter seriously affect the thermoelectric properties of iron and therefore the Type J thermocouples If Type J thermocouples are taken to high temperatures especially above 900C they will lose accuracy of their calibration when they are recycled to lower temperatures Publication 1746 UM007C EN P July 2004 C 2 Thermocouple Restrictions K Type Thermocouple Publication 1746 UM007C EN P July 2004 ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type J commercial thermocouples be 2 2C between 0 and 277C and 3 4 percent between 277 and 760C Limits of error are not specified for Type J thermocouples below OC or above 760C Type J thermocouples can also be supplied to meet special limits of error which are equal to one half the limits given above The recommended upper temperature limit for protected thermocouples 760C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decreases to 593C for AWG 14 1 6mm and 371C for
35. set in the channel status word and the channel status LED blinks The SLC processor reads the converted thermocouple or millivolt data from the module at the end of the program scan or when commanded by the ladder program The processor and thermocouple module determine that the backplane data transfer was made without error and the data is used in your ladder program Overview 1 5 Module Operation The thermocouple module input circuitry consists of four differential analog inputs multiplexed into a single analog to digital A D convertor The mux circuitry also continuously samples the CJC A and CJC B sensors and compensates for temperature changes at the cold junction terminal block The figure on the following page shows a block diagram for the analog input circuitry The A D convertor reads the selected input signal and converts it to a digital value The multiplexer sequentially switches each input channel to the module s A D convertor Multiplexing provides an economical means for a single A D convertor to convert multiple analog signals However it does affect the speed at which an input signal can change and still be detected by the convertor Thermocouple Compatibility The thermocouple module is fully compatible with all SLC 500 fixed and modular controllers It is compatible with all NBS MN 125 standard types J K T E R S and B thermocouple sensors and extension wire and with NBS MN 161 14AWG standard type N
36. software described in this manual Reproduction of the contents of this manual in whole or in part without written permission of Rockwell Automation Inc is prohibited Throughout this manual we use notes to make you aware of safety considerations Identifies information about practices or circumstances that can cause an explosion in a hazardous environment which may lead to personal injury or death property damage or economic loss IMPORTANT Identifies information that is critical for successful application and understanding of the product Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attentions help you ATTENTION e identify a hazard e avoid a hazard e recognize the consequence TAATA Labels may be located on or inside the drive to alert people that dangerous voltage may be present EITT Labels may be located on or inside the drive to alert people that surfaces may be dangerous temperatures Summary of Changes The information below summarizes the changes to this manual since the last printing To help you find new and updated information in this release of the manual we have included change bars as shown to the right of this paragraph For information on See page Changes to the SLC 500 Thermocouple mV Input Module throughout manual Using RSLogix 500 to configure the NT4 module 2 4
37. terminal block This gives a good indication of what the temperature is inside the control cabinet Finally set channel 2 back to type K thermocouple Program Listing Set up all four channels S 1 COP COPY FILE 1 E 15 Source N10 0 Dest 0 3 0 Length 4 Set channel 2 to CJC MOV i E Poaki KOVE _J 0 0 Source N10 4 Set channel 2 back to type K Dest 032 I 1 0 B3 MOV 1 t OSR MOVE 0 1 Source N10 2 Dest 0 3 2 END Data Table data 0 address 15 data 0 0000 1001 0001 0001 N10 3 0000 1001 0001 0001 0000 1001 0001 0001 N10 4 0000 1001 0001 1111 0000 1001 0001 0001 Ti While the module performs the configuration alteration it does not monitor input device data change at any channel Refer to page 4 9 Channel Turn On Turn Off and Reconfiguration Times Publication 1746 UM007C EN P July 2004 6 4 Ladder Programming Examples Verifying Channel Configuration Changes address N10 0 N10 1 N10 2 Publication 1746 UM007C EN P July 2004 When executing a dynamic channel configuration change there will always be a delay from the time the ladder program makes the change to the time the NT4 gives you a data word using that new configuration information Therefore it is very important to verify that a dynamic channel configuration change took effect in the NT4 module particularly if the channel being dynamically configured is used f
38. the shield drain wire at one end only The preferred location is to the same point as the Chapter 3 Installion and Wiring sensor ground reference For grounded thermocouples or mV sensors this is at the sensor For oe s insulated ungrounded thermocouples this is at the NT4 module oe Terminal Block CJC A Assembly Thermocouple Wire Refer to the paragraph above al Configure the system Reference Configure your system I O configuration for the particular slot the NT4 is in slot 1 in this Chapter 4 example Select the module from the drop down list or enter the thermocouple input module ID Preliminary code 3510 Operating l Considerations When using RSLogix 500 version 6 10 or higher you may select Advanced Configuration then vsr Configure to use the software s 1 0 wizard to configure the NT4 see appendix E for details If you use this option proceed to step 8 Publication 1746 UM007C EN P July 2004 programming software online help screens Quick Start for Experienced Users 2 5 EM Determine the operating parameters Reference Determine the operating parameters for channel 0 This example shows the channel 0 configuration word defined with all defaults 0 except for channel enable bit 11 The addressing reflects the location of the module as slot 1 SLC 500 Controller P Data Files M Input Image Output Image 8 words Address 0 1 0 Word 0 Chan
39. to the module Valid input devices are types J K T E R S B and N thermocouple sensors and 50 mV and 100 mV analog input signals The channel can also be configured to read the cold junction temperature calculated for that specific channel When the cold junction compensation CJC temperature is selected the channel ignores the physical input signal Select Data Format Bits 4 and 5 The data format bit field lets you define the expressed format for the channel data word contained in the module input image The data types are engineering units scaled for PID and proportional counts The engineering units allow you to select from two resolutions 1 or 10 For engineering units 1 values are expressed in 0 1 degrees or 0 01 mV For engineering units 10 values are expressed in 1 0 degrees or 0 1 mV Use the 10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit The scaled for PID value is the same for millivolt thermocouple and CJC input types The input signal range is proportional to your selected input type and scaled into a 0 16 383 range which is standard to the SLC PID algorithm The proportional counts are scaled to fit the defined temperature or voltage range The input signal range is proportional to your selected input and scaled into a 32 768 to 32 767 range Publication 1746 UM007C EN P July 2004 5 6 Channel Configuration Data and Status Publication 1746 UM007C EN P J
40. trademarks of Rockwell Automation Belden is a trademark of Belden Inc C UL is a registered trademark of Underwriters Laboratories www rockwellautomation com Power Control and Information Solutions Headquarters Americas Rockwell Automation 1201 South Second Street Milwaukee WI 53204 2496 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Europe Middle East Africa Rockwell Automation Vorstlaan Boulevard du Souverain 36 1170 Brussels Belgium Tel 32 2 663 0600 Fax 32 2 663 0640 Asia Pacific Rockwell Automation Level 14 Core F Cyberport 3 100 Cyberport Road Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Publication 1746 UM007C EN P July 2004 Supersedes Publication 1746 UM007B EN P June 2004 Copyright 2004 Rockwell Automation Inc All rights reserved Printed in the U S A
41. your configuration in O e 0 through O e 3 For example whenever a channel is disabled O e x 11 0 its corresponding status word shows all zeros This condition tells you that input data contained in the data word for that channel is not valid and should be ignored 11 CH 1 Channel Status Word 11 10 9 8 7 6 5 4 3 2 1 0 3 co co N o Sz E S E E e6 TITT H 2 Channel Status Word 11 10 9 8 7 6 5 4 3 2 1 0 7 TITT CH 3 Channel Status Word HHHH 11 10 9 8 7 6 5 4 3 2 1 0 The channel status word can be analyzed bit by bit In addition to providing information about an enabled or disabled channel each bi s status 0 or 1 tells you how the input data from the thermocouple or millivolt analog sensor connected to a specific channel will be translated for your application The bit status also informs you of any error condition and can tell you what type error occurred A bit by bit examination of the status word is provided in the chart on the following page Publication 1746 UM007C EN P July 2004 5 14 Channel Configuration Data and Status Bit s Define These bit settings Indicate this 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 3 Input type 0 0 0 0 hermocouple Type J hermocouple Type K hermocouple Type T hermocouple Type E hermocouple Type R hermocouple Type S hermocouple Type B a 7 7 z 7 hermocouple Type N 0 0 0 50
42. 0 0 0 1 1 0 x 0 0 0 0 0 oO 1 Channel 2 Steam 0 0 0 0 1 1 0 x 0 0 0 0 0 0 0 Channel 3 Chilled H20 A A A Input Type Select e Data Format Select e Open Circuit Select e Temperature Units Select e Filter Frequency Select e Channel Enable e Not Used Bits 0 3 Input Type Select 0000 J 0100 R 1000 50 mV 0001 K 0101 S 1001 100 mV 0010 T 0110 B 1111 CJC temperature 0011 E 0111 N 4 and 5 Data Format Select 00 engineering units x1 0 1 step 10 scaled for PID 0 to 16383 0 01 mV step 11 proportional counts 32768 to 32767 01 engineering units x10 1 step 0 1 mV step 6 and 7 Open Circuit Select 00 zero 01 upscale 10 downscale 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz 11 Channel Enable 0 channel disabled 1 channel enabled 12 15 Not Used 0000 always make this setting Publication 1746 UM007C EN P July 2004 Application Examples 8 7 Program Setup and Operation Summary 1 Set up two configuration words in memory for each channel one for C and the other for F In addition set up two configuration words to monitor the thermocouple s CJC temperature Monitoring the CJC temperature gives a good indication of the temperature inside of the control cabinet the SLC is mounted in The table below shows the configuration word allocation summary Channe
43. 0 035 N A lA8 X 0 050 N A 1A16 X 0 085 N A IM4 X 0 035 N A IM8 X 0 050 N A Publication 1746 UM007C EN P July 2004 3 4 Installation and Wiring Publication 1746 UM007C EN P July 2004 1746 NT4 5V dc Amps 24V dc Amps IM16 X 0 085 N A 0A8 X 0 185 N A OA16 X 0 370 N A OAP12 X 0 370 N A IB8 X 0 050 N A IB16 X 0 085 N A vg X 0 050 N A V16 X 0 085 N A IG16 X 0 140 N A OV8 X 0 135 N A OV16 X 0 270 N A OB8 X 0 135 N A OBP8 X 0 135 N A 0G16 X 0 180 N A OW4 X 0 045 0 045 OW8 X 0 085 0 090 OW16 0 170 0 180 104 X 0 030 0 025 108 X 0 060 0 045 1012 X 0 090 0 070 NI4 X 0 025 0 085 NIO4I X 0 055 0 145 NIO4IV X 0 055 0 115 FIO4 X 0 055 0 150 FIOAV X 0 055 0 120 DCM X 0 360 N A HS X 0 300 N A OB16 X 0 28 N A IN16 X 0 085 N A BASn X 0 150 0 125 BAS X 0 150 0 040 0B32 0 452 N A 0V32 0 452 N A IV32 X 0 106 N A 1832 X 0 106 N A 0X8 X 0 085 0 090 NO4I 0 055 0 195 Installation and Wiring 3 5 Module Installation and Removal 1746 Na svdcAmps 2WdcAms NO4V x 0 055 0 145 ITB16 x 0 085 N A ITV16 x 0 085 N A IC16 x 0 085 N A KE x 0 150 0 040 KEn x 0 150 0 145 OBP16 x 0 250 N A OVP16 x 0 250 N A NT4 x 0 060 0 040 NR4 x 0 050 0 050 HSTP1 x 0 020 N A General Considerations Most applications require installation in an industrial enclosure to reduc
44. 00 regardless of any previous setting that may have been made to the configuration word Input Type Status Bits 0 3 The input type bit field indicates what type of input signal you have configured for the channel This field reflects the input type defined in the channel configuration word Data Format Type Status Bits 4 and 5 The data format bit field indicates the data format you have defined for the channel This field reflects the data type selected in bits 4 and 5 of the channel configuration word Open Circuit Type Status Bits 6 and 7 The open circuit bit field indicates how you have defined the configuration word and therefore the response of the thermocouple module to an open circuit condition This feature is active for all input types including CJC temperature input Publication 1746 UM007C EN P July 2004 5 16 Channel Configuration Data and Status Publication 1746 UM007C EN P July 2004 Temperature Units Type Status Bit 8 The temperature units field indicates the state of the temperature units bit in the configuration word bit 8 Channel Filter Frequency Bits 9 and 10 The channel filter frequency bit field reflects the filter frequency you selected in the configuration word Channel Status Bit 11 The channel status bit indicates the operational state of the channel When the channel enable bit is set in the configuration word bit 11 the thermocouple module configures the selected chan
45. 6 NT4 1746 IB8 Application Setup Four Channels C F This example shows how to display the temperature of several different thermocouples at one annunciator panel A selector switch 1 2 0 allows the operator to choose between displaying data in C and F A second selector switch 1 2 1 allows the operator to switch one of the displays between the ambient temperature near the bath and the temperature inside of the control cabinet that houses the SLC 500 Each of the displays is a 4 digit 7 segment LED display with the last digit representing tenths of a degree The displays have DC sinking inputs and use a BCD data format Device Configuration O 5 1746 0B16 A Ambient Temperature Thermocouple Type T O Cabinet Ambient Bath Steam Chilled H20 Ga Chilled H20 Pipe Cabinet Type J A F Chilled Thermocouple Publication 1746 UM007C EN P July 2004 Ambient oe i Bath Selector Switches Thermocouple 1 2 1 and 1 2 0 Type J j Ype K Ze wl Steam Thermocouple O a ee eee e o Saa a Application Examples 8 5 Channel Configuration Configuration setup for ambient thermocouple e channel 0 e type T thermocouple e display temperature to tenths of a degree e zero data word in the event of an open circuit
46. 60 C 32 F to 140 F Storage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 without condensation Certification C UL Listed Industrial Control Equipment Dus for use in Class 1 Div 2 Hazardous Locations C Marked for all applicable directives Qe CSA approved 1 When the NT4 module detects 0 C 32 F 3 C 5 4 F at the CJC it will detect an out of range condition and set values to downscale 270 C 454 F It is recommended that ambient temperature surrounding the SLC 500 system be maintained above 3 C 37 4 F in order for the NT4 module to measure temperature correctly without detecting an out of range condition Input Specifications Specification Specifications A 3 Value Type of Input Selectable Thermocouple Type J 210 C to 760 C 346 F to 1400 F Thermocouple Type K 270 C to 1370 C 454 F to 2498 F Thermocouple Type T 270 C to 400 C 454 F to 752 F Thermocouple Type E 270 C to 1000 C 454 F to 1832 F Thermocouple Type R 0 C to 1768 C 32 F to 3214 F Thermocouple Type S 0 C to 1768 C 32 F to 3214 F Thermocouple Type B 300 C to 1820 C 572 F to 3308 F Thermocouple Type N 14 AWG 0 C to 1300 C 32 F to 2372 F Millivolt 50 mV dc to 50 mV dc Millivolt 100 mV dc to 100 mV dc Thermocouple Linearization IPTS 68 standard NBS MN 125 NBS MN 161 Cold Junction Compensation
47. AWG 20 0 8mm and 427C for AWG 24 or 28 0 5 or 0 3mm TTT The Constantan element of Type J thermoelements is not interchangeable with the Constantan element of Types T or N due to the different ration of copper and nickel in each S Platinum 10 Rhodium vs Platinum R Platinum 13 Rhodium vs Platinum The ASTM manual STP 470 1970 indicates the following restrictions on the use of S and R type thermocouples at high temperatures They should not be used in reducing atmospheres nor in those containing metallic vapor such as lead or zinc nonmetallic vapors such as arsenic phosphorous or sulfur or easily reduced oxides unless suitable protected with nonmetallic protecting tubes They should never be inserted directly into a metallic primary tube The positive thermoelement platinum 10 rhodium 13 rhodium for R is unstable in a thermal neutron flux because the rhodium converts to palladium The negative thermoelement pure platinum is relatively stable to neutron transmutation However fast neutron bombardment will cause physical damage which will change the thermoelectric voltage unless it is annealed out The thermoelectric voltages of platinum based thermocouples are sensitive to their heat treatments In particular quenching from high temperatures should be avoided Publication 1746 UM007C EN P July 2004 C 6 Thermocouple Restrictions Publication 1746 UM007C EN P July 2004
48. AWG 24 or 28 0 5 or 0 3mm TE The Constantan element of Type J thermoelements is not interchangeable with the Constantan element of Types T or N due to the different ration of copper and nickel in each Nickel Chromium vs Nickel Aluminum This type is more resistant to oxidation at elevated temperatures than the Types E J or T thermocouples and consequently it finds wide application at temperatures above 500C Type K thermocouples may be used at liquid hydrogen temperatures However their Seebeck coefficient about 4uV K at 20K is only about one half of that of E thermocouples Furthermore the thermoelectric homogeneity of KN thermoelements is generally not quite as good as that of EN thermoelements Both the KP and the KN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures Type K thermocouples are recommended by the ASTM 1970 for continuous use at temperatures within the range 250 to 1260C in oxidizing or inert atmospheres Both the KP and the KN thermoelements are subject to oxidation when used in air above about 850C but even so Type K thermocouples may be used at temperatures up to about 1350C for short periods with only small changes in calibration Thermocouple Restrictions C 3 T Type Thermocouple They should not be used in sulfurous reducing or alternately reducing and oxidizing atmospheres unl
49. Accuracy 1 5 C 0 C to 85 C 32 F to 185 F Input Impedance Greater than 10MW Temperature Scale Selectable C or F and 0 1 C or 0 1 F DC Millivolt Scale Selectable 0 1 mV or 0 01 mV Open Circuit Detection Leakage Current 12 nA maximum Open Circuit Detection Method Upscale Time to Detect Open Circuit 500 msec or 1 module update time whichever is greater Input Step Response See Channel Step Response page 4 6 Input Resolution See Input Resolution Graphs on following pages The graphs show the smallest measurable unit based on the combined hardware and software tolerances Display Resolution See Channel Data Word page 5 12 Overall Module Accuracy 25 C 77 F See 1746 NT4 Module Accuracy page A 4 Overall Module Accuracy 0 C to 60 C 32 F to 140 F See 1746 NT4 Module Accuracy page A 4 Overall Module Drift See 1746 NT4 Module Accuracy page A 4 Module Update Time See Update Time page 4 7 Channel Turn On Time Reconfiguration Time Requires up to one module update time plus one of the following 50 Hz Filter 82 milliseconds 60 Hz Filter 196 milliseconds 50 Hz Filter 226 milliseconds 10 Hz Filter 946 milliseconds Channel Turn Off Time Requires up to one module update time refer to page 4 7 Publication 1746 UM007C EN P July 2004 A 4 Specifications 1746 NT4 Module Accuracy
50. Frequency Bits 9 and 10 The channel filter frequency bit field lets you select one of four filters available for a channel The filter frequency affects the channel update time and noise rejection characteristics A smaller filter frequency increases the channel update time but also increases the noise rejection and channel resolution A larger filter frequency decreases the noise rejection but also decreases the channel update time and channel resolution e 250 Hz setting provides minimal noise filtering e 60 Hz setting provides 60 Hz AC line noise filtering e 50 Hz setting provides 50 Hz AC line noise filtering e 10 Hz setting provides both 50 Hz and 60 Hz AC line noise filtering When a CJC input type is selected this field is ignored Publication 1746 UM007C EN P July 2004 5 12 Channel Configuration Data and Status Channel Data Word Module Input Image Data Word Select Channel Enable Bit 11 You use the channel enable bit to enable a channel The thermocouple module only scans those channels that are enabled To optimize module operation and minimize throughput times unused channels should be disabled by setting the channel enable bit to zero When set 1 the channel enable bit is used by the module to read the configuration word information you have selected While the enable bit is set modification of the configuration word may lengthen the module update time for one cycle If any change is made to the
51. HIGH 1832 F Solution Proportional Counts Equivalent 65536 x 1000 F 454 F 1832 F 454 F 32768 8916 Publication 1746 UM007C EN P July 2004 Channel Configuration Data and Status 5 9 1746 NT4 Thermocouple Module Channel Data Word Format Input Type Data Format Engineering Units x 10 Engineering Units x 1 Scaled for Proportional PID Counts Celsius Fahrenheit Celsius Fahrenheit J 210 to 760 346 to 1400 2100 to 7600 3460 to 14000 0 to 16383 32768 to 32767 K 270 to 1370 454 to 2498 2700 to 13700 4540 to 24980 0 to 16383 32768 to 32767 T 270 to 400 454 to 752 2700 to 4000 4540 to 7520 0 to 16383 32768 to 32767 E 270 to 1000 454 to 1832 2700 to 10000 4540 to 18320 0 to 16383 32768 to 32767 R 0 to 1768 32 to 3214 0 to 17680 320 to 32140 0 to 16383 32768 to 32767 5 0 to 1768 32 to 3214 0 to 17680 320 to 32140 0 to 16383 32768 to 32767 B 300 to 1820 572 to 3308 3000 to 18200 5720 to 3276712 0 to 16383 32768 to 32767 N 0 to 1300 32 to 2372 0 to 13000 320 to 23720 0 to 16383 32768 to 32767 50 mV 500 to 500 500to 500 5000 to 5000 5000 to 5000 Oto 16383 32768 to 32767 100 mV 1000 to 1000 1000 to 1000 10000 to 10000 10000 to 10000 0 to 16383 32768 to 32767 CJC Sensor Oto 85 32 to 185 0 to 850 32 to 1850 0 to 16383 32768 to 32767 1 When millivolts are selected
52. MySupport feature that you can customize to make the best use of these tools For an additional level of technical phone support for installation configuration and troubleshooting we offer TechConnect Support programs For more information contact your local distributor or Rockwell Automation representative or visit http support rockwellautomation com Installation Assistance If you experience a problem with a hardware module within the first 24 hours of installation please review the information that s contained in this manual You can also contact a special Customer Support number for initial help in getting your module up and running United States 1 440 646 3223 Monday Friday 8am 5pm EST Outside United Please contact your local Rockwell Automation representative for any States technical support issues New Product Satisfaction Return Rockwell Automation tests all of our products to ensure that they are fully operational when shipped from the manufacturing facility However if your product is not functioning and needs to be returned United States Contact your distributor You must provide a Customer Support case number see phone number above to obtain one to your distributor in order to complete the return process Outside United Please contact your local Rockwell Automation representative for States return procedure Allen Bradley is a registered trademark of Rockwell Automation SLC and RSLogix are
53. Status LED s blinking y Module fault Normal module condition operation Fault condition Y Check to see End Are that module is faulted channel s seated properly configured for mV or in chassis thermocouple Cycle power input thermocouple Is more than one LED blinking Yes Check channel status word CJC fault bits 12 15 has occurred Bit 15 Checkthat wiring is secure at set 1 both CJC assemblies and that the temperature within the enclosure is in the range limits of the CJC sensor Retry Bit14 set 1 Is problem Is problem corrected cu corrected Bit 13 gt set 1 Contact your local Contact your local distributor or distributor or Rockwell Rockwell Bit 12 Automation Automation set 1 Publication 1746 UM007C EN P July 2004 less than the low scale limit for the channel or the CJC connections Correct and Retry ae aie Contact your local An open circuit condition is distributor or present Check channel and Rockwell t CJC wiring for open or loose connections Retry Automation Module Diagnostics and Troubleshooting 7 7 Replacement Parts The NT4 module has the following replaceable parts Part Catalog Number Replacement Terminal Block 1746 RT32 Replacement Terminal Cover 1746 R13 Series B 1746 NT4 Installation Instructions 1746 IN010 Contacting Rockwell If you need to contact Rockwell Automation for assistance please have the follow
54. Write NT4 Steam Temperature to Display TOD TO BCD Source 1 1 2 Dest 0 5 0 eet ee Rung 2 11 Write NT4 Chilled Temperature to Display TOD TO BCD Source 1 1 3 Dest 0 6 0 Rung 2 12 END Data Table address 15 data 0 address 15 data 0 N10 0 0000 1101 0000 0010 N10 5 0000 1100 0000 0000 N10 1 0000 1101 0000 0000 N10 6 0000 1100 0000 0001 N10 2 0000 1101 0000 0001 N10 7 0000 1100 0000 0000 N10 3 0000 1101 0000 0000 N10 8 0000 1101 0000 1111 N10 4 0000 1100 0000 0010 N10 9 0000 1100 0000 1111 Publication 1746 UM007C EN P July 2004 Electrical Specifications Specifications Appendix A This appendix lists the specifications and input resolution curves for the 1746 NT4 4 Channel Thermocouple mV Input Module Specification Value Backplane Current 60 mA at 5V de Consumption 40 mA at 24V de Backplane Power Consumption 0 8W maximum 0 3W 5V dc 0 5W 24V dc Number of Channels 4 backplane isolated 1 0 Chassis Location Any 1 0 module slot except slot 0 A D Conversion Method Sigma Delta Modulation Input Filtering Low pass digital filter with programmable notch filter frequencies Normal Mode Rejection between input and input Greater than 100 dB at 50 Hz 10 Hz 50 Hz filter frequencies Greater than 100 dB at 60 Hz 10 Hz 60 Hz filter frequencies Common Mode Rejection between inputs and chassis ground
55. address status word 4 3 supplementary application example 8 4 exposed thermocouples Publication 1746 UM007C EN P July 2004 2 Index using multiple thermocouples D 1 extension wire 1 5 F filter frequency definition G 2 examining in status word 5 16 setting in configuration word 5 11 FSR definition G 2 full scale error definition G 2 full scale range definition G 2 G gain drift definition G 2 gain error definition G 2 gain error See full scale error getting started tools required 2 1 grounded thermocouples using multiple thermocouples D 1 H heat considerations 3 5 ID code 4 1 input channel multiplexing 1 5 input data scaling definition G 2 input device type 5 5 examining in status word 5 15 setting in configuration word 5 5 input filter See filter frequency input image See status word and data word input response to slot disabling 4 10 installation considerations 3 5 equipment required 2 1 getting started 2 1 heat and noise considerations 3 5 location in chassis 3 3 Publication 1746 UM007C EN P July 2004 LEDs channel status indicators 1 3 location on module 1 2 module status indicator 1 3 local configuration G 2 LSB definition G 2 input signal range 5 5 manuals related P 2 module ID code how to enter 4 1 module operation calibration 3 13 LED indicators 7 3 overview 1 5 power up diagnostics 7 1 programming 6 1 troubleshooting 7 6 multiplexing 1 5 multiplexor definitio
56. agram 3 7 terminal wiring cold junction compensation 3 12 wiring inputs 3 11 thermistors 3 12 thermocouple types calibration 3 13 compatibility 1 5 compatibility with other SLC products 1 5 E type C 4 exposed junction D 1 general description 1 1 grounded junction D 1 hardware features 1 2 installation and removal 3 5 J type C 1 K type C 2 LEDs 7 3 location in chassis 3 3 overview 1 1 power requirements 3 2 power up diagnostics 7 1 programming 6 1 restrictions C 1 S and R types C 5 specifications A 1 T type C 3 temperature ranges A 3 troubleshooting 7 6 ungrounded junction D 1 wiring 3 8 tools required for installation 2 1 troubleshooting LED examination 7 3 turn off time 4 9 turn on time 4 9 U under range error fault bit 5 16 Publication 1746 UM007C EN P July 2004 4 Index overview 5 16 update time definition G 3 V Verification of dynamic configuration change 6 4 Publication 1746 UM007C EN P July 2004 WwW wiring 3 1 routing considerations 3 5 terminal wiring cold junction compensation 3 12 shield connections 3 10 worksheets B 1 Index 5 Publication 1746 UM007C EN P July 2004 Rockwell Automation Rockwell Automation provides technical information on the web to assist you in using our products At http support rockwellautomation com you can Support find technical manuals a knowledge base of FAQs technical and application notes sample code and links to software service packs and a
57. an be used with a single grounded and or exposed thermocouple that touches electrically conductive material or multiple grounded thermocouples that have the protective sheath made of an electrically non conductive material such as ceramic e Ground the shield drain wire at one end only The preferred location is to the same point as the sensor ground reference For grounded thermocouples or mV sensors this is at the sensor For insulated ungrounded thermocouples this is at the module Refer to IEEE Std 518 Section 6 4 2 7 or contact your sensor manufacturer for additional details Publication 1746 UM007C EN P July 2004 3 10 Installation and Wiring Publication 1746 UM007C EN P July 2004 e If it is necessary to connect the shield at the module each input channel has a convenient shield connection screw terminal that provides a connection to chassis ground All shields are internally connected so any shield terminal can be used with channels 0 3 For maximum noise reduction one shield terminal must be connected to earth ground potential i e mounting bolt on 1746 chassis e Tighten terminal screws using a flat or cross head screwdriver Each screw should be turned tight enough to immobilize the wire s end Excessive tightening can strip the terminal screw The torque applied to each screw should not exceed 5 Ib in 0 565 Nm for each terminal e The open thermocouple detection circuit injects approxi
58. ated in bits 12 15 of the channel s status word Channel faults are self clearing and the channel LED will stop blinking and resume steady illumination when the fault conditions are corrected IMPORTANT If you clear 0 a channel enable bit 11 all channel status information is reset Module Diagnostics and Troubleshooting 7 3 LED Indicators The thermocouple module has five LEDs Four of these are channel status LEDs numbered to correspond to each of the thermocouple s input channels and one is a module status LED INPUT CHANNEL 012 STATUS T 3 MODULE STATUS THERMOCOUPLE mV Channel LEDs lt Module Status LED lf And Indicated Condition Corrective action Module Channel Status Status LED is LED is On On Channel Enabled No action required Blinking Open Circuit Condition To determine the exact error check the Outof R error bits in the input image Check the a Eat ange channel configuration word for valid data eee Make sure that the input type is indicated Channel Configuration correctly in bits 0 3 and that the open Error circuit selection state bits 6 and 7 is valid Refer to the troubleshooting flowchart on page 7 6 and chapter 5 for more information Off Power Up No action required Channel Not Enabled No action required For an example of how to enable a channel refer to chapter 2 Quick Start for Exp
59. be detected at power up or during module operation Once in a module error state the thermocouple module no longer communicates with the SLC processor Channel states are disabled and data words are cleared 0 Failure of any diagnostic test results in a non recoverable error and requires the assistance of your local distributor or Rockwell Automation Publication 1746 UM007C EN P July 2004 7 6 Module Diagnostics and Troubleshooting Troubleshooting Flowchart Check LEDs on module i i l Channel Channel Status LED Status LED off on Channel is Channel enabled not enabled and working properly word bit 11 Retry Enable channel if desired by setting channel config zi Configuration error Check configuration word bits 0 3 for valid input type configuration as well as bits 6 and 7 for valid configuration setting Retry Over range condition exists The input signal is greater than the high scale limit for the channel or the CJC connections Correct and Retry Under range condition exists The input signal is Yes Is problem corrected No Module Module Channel Status LED off Status LED on
60. c slot in the 1746 chassis The module ID code for the thermocouple module is shown below Catalog Number ID Code 1746 NT4 3510 No special I O configuration information is required The module ID code automatically assigns the correct number of input and output words Publication 1746 UM007C EN P July 2004 4 2 Preliminary Operating Considerations Module Addressing SLC 5 0X Data Files Input Image Publication 1746 UM007C EN P July 2004 The following memory map shows you how the output and input image tables are defined for the thermocouple module Bit15 Bit0 Address Channel 0 Configuration Word Word0 O e 0 Channel 1 Configuration Word Word1 O e 1 Channel 2 Configuration Word Word2 O e 2 Thermocouple Channel 3 Configuration Word Word3 0 e 3 Module Image Table Output Image Words 4 7 not defined Output Image 8 Words Word spe Address Input Image 8 Words Channel 0 Data Word Word0 e 0 Channel 1 Data Word Word1 e 1 Class 1 Input Image Channel 2 Data Word Word2 e 2 Channel 3 Data Word Word3 e 3 Channel 0 Status Word Word4 e 4 Channel 1 Status Word Word5 e 5 Channel 2 Status Word Word6 e 6 Channel 3 Status Word Word7 ke7 Bit 15 BitO Output Image Configuration Words The 8 word thermocouple module output image defined as the output from the CPU to the thermocouple module contains information that you configure to define the way a spec
61. ch is turned to the ambient position and the degrees selector switch is in the Farenheit position configure channel 0 to read the ambient temperature thermocouple in degrees Fahrenheit Degrees Ambient Cabinet aA Selector Switch Configure NT4 Ambient Channels 1 2 0 1 2 0 B3 MOY It I OSR MOVE 0 1 1 Source N10 0 Dest OF1 0 Rung 2 2 If the ambient cabinet selector switch is turned to the cabinet position and the degrees selector switch is in the Farenheit position configure channel 0 to read the CJC sensor on the NT4 module in degrees Fahrenheit Degrees Ambient Cabinet Selector Switch Selector Switch Configure NT4 Fahrenheit Ambient Channels I 2 0 I 2 0 B3 MOV 1 1 L OSR MOVE 0 1 2 Source N10 8 Dest 0 1 0 Rung 2 3 If the degrees selector switch is turned to the Celsius position set up all four channels to read in degrees Celsius The default for channel 0 is to read the ambient temperature thermocouple Degrees Selector Switch Configure NT4 Celsius Channels 1 2 0 B3 COR 1 1 OSRH COPY FILE 0 3 Source N10 4 Dest 0 1 0 Length 4 Publication 1746 UM007C EN P July 2004 Application Examples 8 9 Rung 2 4 If the ambient cabinet selector switch is turned to the ambient position and the degrees selector switch is in the Celsius position configure channel 0 to read the ambient temperature thermocouple in degrees Celsius Degrees Ambient Cabi
62. channel cycles are required to perform an autocalibration and it is important to remember that during autocalibration the module is not converting input data To maintain system accuracy we recommend that you periodically perform an autocalibration cycle for example e whenever an event occurs that greatly changes the internal temperature of the control cabinet such as opening or closing its door e at a convenient time when the system is not making product such as during a shift change An autocalibration programming example is provided in chapter 6 Accuracy specifications with and without autocalibration are provided in Appendix A Publication 1746 UM007C EN P July 2004 3 14 Installation and Wiring Publication 1746 UM007C EN P July 2004 Module ID Code Chapter 4 Preliminary Operating Considerations This chapter explains how the thermocouple module and the SLC processor communicate through the module s input and output image It lists the preliminary setup and operation required before the thermocouple module can function in a 1746 I O system Topics include e Module ID Code e Module Addressing e Channel Filter Frequency Selection e Update Time e Channel Turn On Turn Off and Reconfiguration Times e Response to Slot Disabling The module identification code is a unique number encoded for each 1746 I O module The code defines for the processor the type of I O or specialty module residing in a specifi
63. configuration word for every channel that is being used on each thermocouple mV module repeating the procedures given in steps 1 7 Publication 1746 UM007C EN P July 2004 NT4 Configuration Worksheet B 3 9 Enter the completed configuration words for each module into the summary worksheet on the following page 10 Following the steps outlined in chapter 2 or in chapter 6 enter this configuration data into your ladder program and copy it to the thermocouple module Publication 1746 UM007C EN P July 2004 B 4 NT4 Configuration Worksheet Channel Configuration Worksheet VIINA IAB Va 11 10 9 8 7 5 4 3 2 1 0 Bit Number 0 0 0 0 Channel 0 0 0 0 0 Channel 1 0 0 0 0 Channel 2 0 0 0 0 Channel 3 A A A L__ Input Type Select Data Format Select Open Circuit Select Temperature Units Select Filter Frequency Select Channel Enable Not Used Bit Definitions Description Specification Bits 0 3 Input Type Select 0000 J 0100 R 1000 50 mV 0001 K 0101 S 1001 100 mV 0010 T 0110 B 1111 CJC temperature 0011 E 0111 N Bits 4 and 5 Data Format Select 00 engineering units x1 0 1 step 10 scaled for PID 0 to 16383 0 01 mV step 11 proportional counts 32768 to 01 engineering units x10 1 step 32767 0 1 mV step Bits 6 and 7 Open Circuit Sele
64. ct 00 zero 01 upscale 10 downscale Bit 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select Bits 9 and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz Bit 11 Channel Enable 0 channel disabled 1 channel enabled Bits 12 15 Not Used 0000 always make this setting Publication 1746 UM007C EN P July 2004 J Type Thermocouple Appendix C Thermocouple Restrictions Following are some restrictions extracted from NBS Monograph 125 IPTS 68 issued March 1974 on thermocouples J K T E R and S Iron vs Copper Nickel lt Constantan gt The J thermocouple is the least suitable for accurate thermometry because there are significant nonlinear deviations in the thermoelectric output from different manufacturers The total and specific types of impurities that occur in commercial iron change with time location of primary ores and methods of smelting Type J thermocouples are recommended by the ASTM 1970 for use in the temperature range from 0 to 760C in vacuum oxidizing reducing or inert atmospheres If used for extended times above 500C heavy gauge wires are recommended because the oxidation rate is rapid at elevated temperatures They should not be used in sulfurous atmospheres above 500C Because of potential rusting and embrittlement they are not recommended for subzero temperatures They should not be cycled above 760C even for a short time if accurate
65. cy relates how the digital filter attenuates frequency components of the input signal The update time defines the rate at which an input channel is scanned and its channel data word updated 60 Hz Filter Notch Frequency Frequency Response 3B Amplitude in dB 100 20 0 60 120 180 240 300 Hz Frequency 15 72 Hz Publication 1746 UM007C EN P July 2004 4 6 Preliminary Operating Considerations 250 Hz Filter Notch Fre quency Frequency Response Amplitude in dB Publication 1746 UM007C EN P July 2004 0 250 500 750 1000 1250 1500 Frequency 65 5 Hz Channel Step Response The channel filter frequency determines the channel s step response The step response is time required for the analog input signal to reach 100 of its expected final value This means that if an input signal changes faster than the channel step response a portion of that signal will be attenuated by the channel filter The table on page 4 4 shows the step response for each filter frequency Preliminary Operating Considerations 4 7 Update Time The thermocouple module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and make the resulting data values available to the SLC processor It can be calculated by adding the the sum of all enabled channel sample times plus a CJC update time The NT4 module sequentially samples the c
66. e Type J Thermocouple Type K ao oO Thermocouple Type T ojojoj oj N Thermocouple Type R Thermocouple Type S E h h h Thermocouple Type E h h h Thermocouple Type B Thermocouple Type N ojoj ojoj ojojoj ojo 50mV 100mV ao Invalid Inval Inval ca e i id Invalid id id Inval CJC temperature 4and 5 Data format Engineering units x 1 Engineering units x 1072 Scaled for PID Proportional Counts 6 and 7 Open circuit Zero Upscale Downscale Invalid Templ Degrees C Degrees F 9 and 10 Channel filter frequency 10 Hz 50 Hz 60 Hz 250 Hz Channel enable Channel Disabled Channel Enabled 12 15 1 When mi 2 For engineering units x1 valu Unused Unused 0 0 0 0 llivolt input type is selected the bit setting for temperature units is ignored es are expressed in 0 1 degrees or 0 01 mV For engineering units x10 values are expressed in 1 0 degrees or 0 1 mV Publication 1746 UM007C EN P July 2004 Channel Configuration Data and Status 5 5 Select Input Type Bits 0 3 The input type bit field lets you configure the channel for the type of input device you have connected
67. e the effects of electrical interference Thermocouple inputs are highly susceptible to electrical noises due to the small amplitudes of their signal microvolt C Group your modules to minimize adverse effects from radiated electrical noise and heat Consider the following conditions when selecting a slot for the thermocouple module Position the module e in a slot away from sources of electrical noise such as hard contact switches relays and AC motor drives e away from modules which generate significant radiated heat such as the 32 point I O modules In addition route shielded twisted pair thermocouple or millivolt input wiring away from any high voltage I O wiring When installing the module in a chassis it is not necessary to remove the terminal block from the module However if the terminal block is removed use the write on label located on the side of the terminal block to identify the module location and type SLOT RACK MODULE Publication 1746 UM007C EN P July 2004 3 6 Installation and Wiring Terminal Block Removal ATTENTION Never install remove or wire modules with power applied to the chassis or devices wired to the module To remove the terminal block 1 Loosen the two terminal block release screws 2 Grasp the terminal block at the top and bottom and pull outward and down When removing or installing the terminal block be careful not to damage the CJC sensors
68. el 3 disabled Using the values from the table above add the the sum of all enabled channel sample times plus one CJC update time e channel 0 sampling time 12 ms e channel 1 sampling time 12 ms e channel 2 sampling time 60 ms e CJC update time 14 ms Module update time 12 12 60 14 98 ms Channel Turn On Turn Off and Reconfiguration Times Description Preliminary Operating Considerations The table below gives you the turn on turn off and reconfiguration times for enabling or disabling a channel Duration Turn On Time The time it takes to set the status bit transition from 0 to 1 in the status word after setting the enable bit in the configuration word Requires up to one module update time plus one of the following e 250 Hz Filter 82 ms e 60 Hz Filter 196 ms e 50 Hz Filter 226 ms e 10 Hz Filter 946 ms Turn Off Time The time it takes to reset the status bit transition from 1 to 0 in the status word after resetting the enable bit in the configuration word Requires up to one module update time Reconfiguration Time The time it takes to change a channel configuration if the device type filter frequency or configuration error bits are different from the current setting The enable bit remains ina steady state of 1 Changing temperature mV units or data format does not require reconfiguration time Requires up to one module update time plu
69. erienced Users or chapter 6 Programming Examples If Module Indicated condition Corrective action Status LED is On Proper Operation No action required Off Module Fault Cycle power If condition persists call your local distributor or Rockwell Automation for assistance Publication 1746 UM007C EN P July 2004 7 4 Module Diagnostics and Troubleshooting Publication 1746 UM007C EN P July 2004 Channel Status LEDs Green The channel LED is used to indicate channel status and related error information contained in the channel status word This includes conditions such as e normal operation e channel related configuration errors e open circuit errors e out of range errors All channel errors are recoverable errors and after corrective action normal operation resumes Invalid Channel Configuration Whenever a channel s configuration word is improperly defined the channel LED blinks and bit 15 of the channel status word is set Configuration errors occur when the input type bits 0 3 in the channel configuration word is invalid or when the open circuit state selection bits 6 and 7 is invalid Open Circuit Detection An open circuit test is performed on all enabled channels Whenever an open circuit condition occurs see possible causes listed below the channel LED blinks and bit 12 of the channel status word is set Possible causes of an open circuit include e The thermocouple may be broken
70. ess suitably protected with protecting tubes They should not be used in vacuum at high temperatures for extended times because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration They should also no be used in atmospheres that promote green rot corrosion those with low but not negligible oxygen content ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type K commercial thermocouples be 2 2C between 0 and 277C and 3 4 percent between 277 and 1260C Limits of error are not specified for the Type K thermocouples below OC Type K thermocouples can also be supplied to meet special limits of error which are equal to one half the standard limits of error given above The recommended upper temperature limit for protected Type K thermocouples 1260C applies for AWG 8 3 3mm wire For smaller wires it decreases to 1093C for AWG 14 1 6mm 982C for AWG 20 0 8mm and 871C for AWG 24 or 28 0 5 or 0 3mm Copper vs Copper Nickel lt Constantan gt The homogeneity of most Type TP and TN or EN thermoelements is reasonably good However the Seebeck coefficient of Type T thermocouples is moderately small at subzero temperatures about 5 6uV K at 20K being roughly two thirds that of Type E thermocouples This together with the high thermal conductivity of Type TP thermoelements is the major reason why Type T ther
71. f the Chapter 3 thermocouple input module Installion and Wiring e For modular style systems calculate the total load on the system power supply using the procedure described in the SLC 500 Modular Hardware Style User Manual Publication Appendix A Number 1747 UM011 or the SLC 500 Modular Chassis and Power Supplies Technical Data Specifications Publication Number 1746 TD003 e The fixed 2 slot chassis supports 2 thermocouple input modules If combining a thermocouple module with a different module refer to the module compatibility table found in chapter 3 Publication 1746 UM007C EN P July 2004 Quick Start for Experienced Users 2 3 ral Insert the 1746 NT4 module into the chassis Reference Make sure system power is off then insert the thermocouple input module into your 1746 Chapter 3 chassis In this example procedure local slot 1 is selected Installation and Wiring ATTENTION Never install remove or wire modules with power applied to the chassis or devices wired to the A module W W WH Xa WH W WA Top and Bottom Module Release s Guide NL Publication 1746 UMO007C EN P July 2004 Quick Start for Experienced Users RES Connect the thermocouple wires Reference Connect thermocouple wires to channel 0 on the module s terminal block Make sure both cold junction compensation CJC assemblies are securely attached Ground
72. g the 1746 NT4 Module with RSLogix 500 This appendix describes how to configure the NT4 module with RSLogix 500 v6 10 or higher To configure your module 1 Access the I O Configuration menu 2 Determine the chassis number and slot location of where the NT4 module is located Highlight the module 1 0 Configuration Racks r Current Cards Available 1 174644 4 SlotRack gt Fiter l 10 x 2 fizo Rack Not Installed x Read I0 Config 1746sc Nl8u Analog 8 Ch Universal log 16 Ch Current Input Class 1 Analog 16 Ch Current Input Class 3 Analog 16 Ch Voltage Input Class 1 Analog 16 Ch Voltage Input Class 3 Analog 2 Ch In 2 Ch Current Out Analog 2 Ch In 2 Ch Voltage Out Analog 4 Ch Current Output Analog 4 Ch Voltage Output Analog 8 Channel Current Output Clas Analog 8 Channel Current Output Clas Analog 8 Channel Voltage Output Clas Analog 8 Channel Voltage Output Clas Analog 4 Ch RTD Resistance Input Analog 8 Ch RTD Class 1 Analog 8 Ch RTD Class 3 Analog 4 Ch Thermocouple Input Analog 8 Ch Thermocouple Input 8 Output TRIAC 100 240 VAC 16 Output TRIAC 100 240 VAC Hide All Cards 1746sc OAP8 8 Output Isolated TRIAC 74 276 VAC x 3 1 0 Rack Not Installed i Aha Publication 1746 UM007C EN P July 2004 E 2 Configuring the 1746 NT4 Module with RSLogix 500 3 Press the Adv Config button The following dialog box appears Advanced I 0 Co
73. hannels in a continuous loop Channel 0 Disabled Channel 1 Disabled Channel 2 Disabled Channel 3 Disabled Enabled Sample Enabled Sample Enabled Sample Enabled Sample TA Channel 0 Channel 1 Channel 2 Channel 3 Channels Update CJC Calculate Previous Calculate Previous Calculate Previous Calculate Previous The following table shows the channel sampling times for each filter frequency It also gives the CJC update time CJC Update Channel Sampling Time Time 250 Hz Filter 60 Hz Filter 50 Hz Filter 10 Hz Filter 14 msec 12 msec 50 msec 60 msec 300 msec The fastest module update time occurs when only one channel with a 250 Hz filter frequency is enabled Module update time 12 ms 14 ms 26 ms The slowest module update time occurs when four channels each using a 10 Hz filter frequency 4 300 1200 are enabled Module update time 1200 ms 14 ms 1 214 seconds Publication 1746 UM007C EN P July 2004 4 8 Preliminary Operating Considerations Publication 1746 UM007C EN P July 2004 Update Time Calculation Example The following example shows how to calculate the module update time for the given configuration e channel 0 configured for 250 Hz filter frequency enabled e channel 1 configured for 250 Hz filter frequency enabled e channel 2 configured for 50 Hz filter frequency enabled e chann
74. he procedures described in each step It also references other documentation that may be helpful if you are unfamiliar with programming techniques or system installation requirements If you have any questions or are unfamiliar with the terms used or concepts presented in the procedural steps always read the referenced chapters and other recommended documentation before trying to apply the information This chapter includes e Required Tools and Equipment e Installation Procedures Have the following tools and equipment ready e medium blade screwdriver e medium cross head screwdriver e thermocouple or millivolt sensor e appropriate thermocouple extension wire Gf needed e 4 channel thermocouple mV input module 1746 NT4 e programming equipment Publication 1746 UM007C EN P July 2004 2 2 Quick Start for Experienced Users Installation Procedures eae Check the contents of shipping box Reference Unpack the shipping box making sure that the contents include e thermocouple input module Catalog Number 1746 NT4 e removeable terminal block factory installed on module with CJC sensors attached e installation instructions publication 1746 IN010 If the contents are incomplete call your local Allen Bradley representative for assistance Ensure your chassis supports placement of the 1746 NT4 module Reference Review the power requirements of your system to see that your chassis supports placement o
75. here the thermocouple wires connect to the module wiring terminal There are no output channels on the module Module configuration is done via the user program There are no DIP switches Side Label Channel Status LEDs Green INPUT _ CHANNEL mo Door Labe STATUS a Module Status IESIT LED Green 7 memocovrisnv Pa Removable Terminal A CJC Sensors N Cable Tie Slots iva ON WHIS YIN 9bLL X OYIN CJC At Do Not Remove CHLO CICA Do Not O YAS issvig Nid ATIOVE NITIV Remove CHLO SHIELD Da 1N09 GNI G CHL1 SHIELD NAON LAdNI AU 1ANOJOINUIHL 005 IIS CHLI ZAG O ONY 98 Y Sdi g6l Q SHIELD i CHL2 SHIELD CHL2 SHIELD 9 13009 34NLYHAANIL ONILVHJAA0 CHL3 CJC B lot Remove CHL3 LOA WLOW4 Remove ANLG COM TONWDOLF OF JTAWOOL OOAWOS 0 JQAUOG WSN NI 30VIN o LL Self Locking Tabs Publication 1746 UM007C EN P July 2004 Overview 1 3 System Overview Hardware Function Channel Status LED Display operating and fault status of Indicators channels 0 1 2 and 3 Module Status LED Displays module operating and fault status Side Label Nameplate Provides module infor
76. ication is via the 1747 SN Scanner and 1747 ASB Remote I O Adapter resolution The smallest detectable change in a measurement typically expressed in engineering units e g 0 15C or as a number of bits For example a 12 bit system has 4 096 possible output states It can therefore measure 1 part in 4096 sampling time The time required by the A D converter to sample an input channel status word Contains status information about the channel s current configuration and operational state You can use this information in your ladder program to determine whether the channel data word is valid step response time Specific to the thermocouple module this is the time required for the A D input signal to reach 100 of its expected final value given a large step change in the input signal update time The time required for the module to sample and convert the input signals of all enabled input channels and make the resulting data values available to the SLCt processor Publication 1746 UM007C EN P July 2004 Glossary 4 Notes Publication 1746 UM007C EN P July 2004 A A D definition G 1 addressing configuration word 4 2 data word 4 3 status word 4 3 alarms 6 6 application example basic 8 1 supplementary 8 4 attenuation definition G 1 B bit allocation 5 1 C cable tie slots 1 3 channel definition G 1 channel configuration error 7 4 fault detection bit 5 17 procedure 5 2 B 1 Channel Data Word 5
77. ific channel on the thermocouple module will work These words take the place of configuration DIP switches on the module Although the thermocouple output image is eight words long only output words 0 3 are used to define the operation of the module output words 4 7 are not used Each output word configures a single channel Example If you want to configure channel 2 on the thermocouple module located in slot 4 in the chassis your address would be O 4 2 File lype gt Q 4 2 lt Word Element Word Delimiter Slot Delimiter Preliminary Operating Considerations 4 3 Chapter 5 Channel Configuration Data and Status gives you detailed bit information about the data content of the configuration word Input Image Data Words and Status Words The 8 word thermocouple module input image defined as the input from the thermocouple module to the CPU represents data words and status words Input words 0 3 data words hold the input data that represent the temperature value of thermocouple analog inputs for channels 0 3 This data word is valid only when the channel is enabled and there are no channel errors Input words 4 7 status words contain the status of channels 0 3 respectively The status bits for a particular channel reflect the configuration settings that you have entered into the output image configuration word for that channel and provide information about the channel s operational state To receive valid s
78. iguration information needed by the module to configure and operate each channel Information is written to the configuration word through the logic supplied in your ladder program cutoff frequency The frequency at which the input signal is attenuated 3 dB by the digital filter Frequency components of the input signal below the cut off frequency are passed with under 3dB of attenuation dB decibel A logarithmic measure of the ratio of two signal levels Publication 1746 UM007C EN P July 2004 Glossary 2 Publication 1746 UM007C EN P July 2004 data word A 16 bit integer that represents the value of the analog input channel The channel data word is valid only when the channel is enabled and there are no channel errors When the channel is disabled the channel data word is cleared 0 digital filter A low pass noise filter incorporated into the A D converter The digital filter provides a very steep roll off above its cut off frequency which provides high frequency noise rejection effective resolution The number of bits in the channel data word that do not vary due to noise filter frequency The user selectable first notch frequency for the A D converter s digital filter The digital filter provides high noise rejection at this frequency full scale error gain error The difference in slope between the actual and ideal analog thermocouple transfer functions full scale range FSR The difference be
79. ing information available when you call Automation e a clear statement of the problem including a description of what the system is actually doing Note and record the LED states also note input and output image words for the NT4 module e a list of things you have already tried to remedy the problem e processor type 1747 NT4 series letter and firmware FRN number See label on left side of processor e hardware types in the system including I O modules and chassis e fault code if the SLC processor is faulted Publication 1746 UM007C EN P July 2004 7 8 Module Diagnostics and Troubleshooting Publication 1746 UM007C EN P July 2004 Basic Example Chapter 8 Application Examples This chapter provides two application examples to help you use the thermocouple input module They are defined as a e basic example e supplementary example The basic example builds on the configuration word programming provided in chapter 6 to set up one channel for operation This setup is then used in a typical application to display temperature The supplementary example demonstrates how to perform a dynamic configuration of all four channels The example sets up an application that allows you to manually select whether the displayed thermocouple input data for any channel is expressed in C or F Application Setup Display a Temperature This example indicates the temperature of a bath on an LED display The display require
80. ital temperature readings The 1746 NT4 uses the National Bureau of Standards NBS Monograph 125 and 161 based on IPTS 68 for thermocouple linearization When configured for millivolt analog inputs the module converts the analog values directly into digital values The module assumes that the mV input signal is already linear System Operation At power up the thermocouple module performs a check of its internal circuits memory and basic functions During this time the module status LED remains off If no faults are found during the power up diagnostics the module status LED is turned on Channel Data Word Channel Status Word Thermocouple Thermocouple or mV Input na Analog Signals Module Channel Configuration Word A After power up checks are complete the thermocouple module waits for valid channel configuration data from your SLC ladder logic program channel status LEDs off After configuration data is written to one or more channel configuration words and their channel enable status bits are set the channel status LEDs go on and the thermocouple module continuously converts the thermocouple or millivolt input to a value within the range you selected for the enabled channels Each time a channel is read by the module that data value is tested by the module for a fault condition i e open circuit over range and under range If such a condition is detected a unique bit is
81. l Configuration Word Allocation F C 1 N10 0 N10 4 2 N10 1 N10 5 3 N10 2 N10 6 4 N10 3 N10 7 CJC N10 8 N10 9 2 When the positions of the degrees selector switch or ambient cabinet selector switch change write the appropriate channel configurations to the NT4 module Note that the use of the OSR instruction one shot rising makes these configuration changes edge triggered i e the NT is reconfigured only when a selector switch changes position Cabinet C OF Selector Switches J Ambient 3 Monitor the channel 0 status word to determine which temperature is being displayed ambient or cabinet and energize the appropriate pilot light 4 Convert the individual thermocouple data words to BCD and send the data to the respective LED displays Program Listing The first six rungs of the program starting on the next page send the correct channel setup information to the NT4 module based on the position of the two selector switches Publication 1746 UM007C EN P July 2004 Application Examples Rung 2 0 lf the degrees selector switch is turned to the Fahrenheit position set up all four channels to read in degrees Fahrenheit The default for channel 0 is to read the ambient temperature thermocouple Degrees Selector Switch Configure NT4 Fahrenheit Channels I 2 0 B3 COP OSRH COPY FILE 0 0 Source N10 0 Dest 0 1 0 Length 4 Rung 2 1 lf the ambient cabinet selector swit
82. mately 12 nanoamperes into the thermocouple cable A total lead resistance of 25 ohms 12 5 one way will produce 0 3 mV of error To reduce error use large gage wire with less resistance for long wire runs e Follow system grounding and wiring guidelines found in your SLC 500 Modular Hardware Style User Manual publication 1747 UM011 Installation and Wiring 3 11 Wiring Input Devices to the NT4 After the thermocouple module is properly installed in the chassis follow the wiring procedure below using the proper thermocouple extension cable or Belden 8761 for non thermocouple applications Cut foil shield and drain wire then insulate at cable end Signal Wire Signal Wire Signal Wire Drain Wire Foil Shield Signal Wire Twist together shrink wrap and connect to earth ground To wire your NT4 module 1 At each end of the cable strip some casing to expose the individual wires 2 Trim the signal wires to 2 inch lengths Strip about 3 16 inch 4 76 mm of insulation away to expose the end of the wire 3 At one end of the cable twist the drain wire and foil shield together bend them away from the cable and apply shrink wrap Then earth ground at the preferred location based on the type of sensor you are using see Wiring Considerations 4 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap 5 Connect the signal wires to the NT4 terminal block
83. mation Removable Terminal Block Provides physical connection to input devices It is color coded green Door Label Permits easy terminal identification Cable Tie Slots Secure and route wiring from module Self Locking Tabs Secure module in chassis slot General Diagnostic Features The thermocouple mV module contains diagnostic features that can help you identify the source of problems that may occur during power up or during normal channel operation These power up and channel diagnostics are explained in chapter 7 Module Diagnostics and Troubleshooting The thermocouple module communicates to the SLC 500 processor through the parallel backplane interface and receives 5V dc and 24V dc power from the SLC 500 power supply through the backplane No external power supply is required You may install as many thermocouple modules in your system as the power supply can support SLC Processor Thermocouple Modules Publication 1746 UM007C EN P July 2004 1 4 Overview Publication 1746 UM007C EN P July 2004 Each individual channel on the thermocouple module can receive input signals from thermocouple sensors or mV analog input devices You configure each channel to accept either input When configured for thermocouple input types the thermocouple module converts the analog input voltages into cold junction compensated and linearized dig
84. mocouples are less suitable for use in the subzero range than Type E thermocouples Type T thermocouples are recommended by the ASTM 1970 for use in the temperature range 184 to 371C in vacuum or in oxidizing reducing or inert atmospheres The recommended upper temperature limit for continuous service of protected Type T thermocouples is set at 371C for AWG 14 1 6mm thermoelements since Type TP thermoelements oxidize rapidly above this temperature However the thermoelectric properties of Type TP thermoelements are apparently not grossly affected by oxidation since Roeser and Dahl 1938 observed negligible changes in the thermoelectric voltage of Nos 12 18 and 22 AWG Type TP thermoelements after heating for 30 hours in air at 500C At this temperature the Type TN thermoelements have good resistance to oxidation and exhibit only small changes in thermal emf with long exposure in air as shown by the studies of Dahl 1941 Operation of Type T thermocouples in hydrogen atmospheres at temperatures above about 370C is not recommended since severe embrittlement of the Type TP thermoelements may occur Publication 1746 UM007C EN P July 2004 C 4 Thermocouple Restrictions E Type Thermocouple Publication 1746 UM007C EN P July 2004 Type T thermoelements are not well suited for use in nuclear environments since both thermoelements are subject to significant changes in composition under thermal neutron irradia
85. n e Power up Diagnostics e Channel Diagnostics e LED Indicators e Troubleshooting Flowchart e Replacement Parts e Contacting Rockwell Automation The thermocouple module performs operations at two levels e module level operations e channel level operations Module level operations include functions such as power up configuration and communication with the SLC processor Channel level operations describe channel related functions such as data conversion and open circuit detection Internal diagnostics are performed at both levels of operation and any error conditions detected are immediately indicated by the module s LEDs At module powerup a series of internal diagnostic tests is performed These diagnostic tests must be successfully completed or a module error results and the module status LED remains off Publication 1746 UM007C EN P July 2004 7 2 Module Diagnostics and Troubleshooting Channel Diagnostics Publication 1746 UM007C EN P July 2004 When a channel is enabled bit 11 1 a diagnostic check is performed to see that the channel has been properly configured In addition the channel is tested for out of range and open circuit faults on every scan If the channel is configured for thermocouple input or CJC input the CJC sensors are also checked for out of range and open circuits A failure of any channel diagnostic test causes the faulted channel status LED to blink All channel faults are indic
86. n G 2 normal mode rejection definition G 2 0 open circuit defining conditional state of channel data 5 10 downscale enable 5 10 upscale enable 5 10 zero 5 10 detection 7 4 error condition 7 4 fault detection bit 5 16 out of range error detection 7 5 over range error 5 17 fault bit 5 17 under range error 5 16 fault bit 5 16 output image 4 2 output response to slot disabling 4 10 over range error fault indicator bit 5 17 overview 5 17 P PID input type 5 5 instruction 6 5 pinout diagram 3 7 power up sequence 1 4 programming alarms 6 6 6 7 configuration settings making changes 6 3 dynamic 6 3 PID instruction 6 5 verifying channel configuration changes proportional counts input 5 5 publications related P 2 0 quick start for experienced users 2 1 reconfiguration time 4 9 related publications P 2 remote configuration definition G 3 removable terminal block 1 3 resolution definition G 3 effective 4 4 S sampling time definition G 3 scaled for PID 5 5 scaling input data definition G 2 self locking tabs 1 3 shield connections 3 7 3 10 specifications electrical A 1 environmental A 2 input A 3 physical A 2 start up instructions 2 1 status word definition G 3 status word See input image Index 3 step response definition G 3 overview 4 4 system operation 1 4 T temperature units examining in status word 5 16 overview 5 11 setting in configuration word 5 11 terminal pinout di
87. nel 0 Configuration Word 0 0 1 1 Word 1 0 1 2 Word 2 0 1 3 Word3 0 1 7 Word7 Channel 1 Configuration Word Channel 2 Configuration Word Channel 3 Configuration Word Words 4 7 not defined Filter Frequency Open Circuit Data Format Input Type Chapter 4 Preliminary Operating Considerations Chapter 5 Channel Configuration Data and Status Appendix B NT4 Configuration Worksheet Unused Channel Enable Temperature Units cS 0 0 oO lt ic Bit15 Default Setting e Type J Thermocouple e Engineering Units x 1 e Data Word 0 If Open Circuit e Degrees Celsius e 10 Hz Filter Frequency e Channel Disabled Bit 0 0 af 01 0 0 0 0 0 0 VA New Setting Set this bit 11 to enable channel Address 0 1 0 11 Publication 1746 UMO007C EN P July 2004 2 6 Quick Start for Experienced Users hannel 2 Status Word 1 7 Word 7 Program the configuration Reference Do the programming necessary to establish the new configuration word setting in the previous an 6 adder step Programming 1 Create integer file N10 Integer file N10 should contain one element for each cha
88. nel Configuration Procedure Appendix B NT4 Configuration Worksheet The following configuration procedure and worksheet are provided to help you configure each of the channels on your thermocouple module The channel configuration word consists of bit fields the settings of which determine how the channel will operate This procedure looks at each bit field separately and helps you configure a channel for operation Refer to chapter 5 as needed to complete the procedures in this appendix or you may prefer to use the summary worksheet on page B 4 1 Determine the input device type for a channel and enter its respective 4 digit binary code in bit field 0 3 of the channel configuration word Bits 0 3 Input Type Select 1000 50 mV 1001 100 mV R S B N 1111 CJC temperature 2 Select a data format for the data word value Your selection determines how the analog input value registered by the analog sensor will be expressed in the data word Enter your 2 digit binary code in bit field 4 5 of the channel configuration word Bits 4 and 5 Data Format 00 engineering units x1 0 1 step 0 01 mV step Select 01 engineering units x10 1 step 0 1 mV step 10 scaled for PID 0 to 16383 11 proportional counts 32768 to 32767 Publication 1746 UM007C EN P July 2004 B 2 NT4 Configuration Worksheet 3 Determine the desired state for the channel data word if an open circuit condition is detected f
89. nel and takes a data sample for the channel data word before setting this bit in the status word Open Circuit Error Bit 12 This bit is set 1 whenever a configured channel detects an open circuit condition at its input An open circuit at the CJC sensor will also flag this error if the channel input type is either thermocouple or CJC temperature Under Range Error Bit 13 This bit is set 1 whenever a configured channel detects an under range condition for the channel data An under range condition exists when the input value is below the specified lower limit of the particular sensor connected to that channel An under range temperature at the CJC sensor will also flag this error if the channel input type is either thermocouple or CJC temperature Channel Configuration Data and Status 5 17 Over Range Error Bit 14 This bit is set 1 whenever a configured channel detects an over range condition for the channel data An over range condition exists when the input value is above the specified upper limit of the particular sensor connected to that channel An over range temperature at the CJC sensor will also flag this error if the channel input type is either thermocouple or CJC temperature Configuration Error Bit 15 This bit is set 1 whenever a configured channel detects that the channel configuration word is not valid All other status bits reflect the settings from the configuration word even those settings that
90. net Selector Switch Selector Switch Configure NT4 Celsius Ambient Channels 1 2 0 I 2 0 B3 MOV 1 t 11 OSR MOVE 0 1 4 Source N10 4 Dest O 1 0 Rung 2 5 lf the ambient cabinet selector switch is turned to the cabinet position and the degrees selector switch is in the Celsius position configure channel 0 to read the CJC sensor on the NT4 module in degrees Celsius Degrees Ambient Cabinet Selector Switch Selector Switch Configure NT4 Celsius Cabinet Channels I 2 0 I 2 0 B3 MOV I I J OSRH MOVE 0 1 5 Source N10 9 Dest 0 1 0 Rung 2 6 If channel 0 is set up for reading the ambient thermocouple energize the ambient pilot light on the annunciator panel Ambient Light MEQ 0 7 0 MASKED EQUAL C Source I 1 4 0 Mask FEFF Compare N1 0 4 Rung 2 7 If channel 0 is set up for reading the CJC sensor on the NT4 module energize the cabinet pilot light on the annunciator panel Cabinet Light MEQ 0 7 0 MASKED EQUAL C Source I 1 4 1 Mask FEFF Compare N10 9 Publication 1746 UM007C EN P July 2004 8 10 Application Examples Rung 2 8 Convert the NT4 data words to BCD format and send to the LED displays Write NT4 Ambient or Cabinet Temperature to Display TOD TO BCD Source I 1 0 Dest 0 3 0 Rung 2 9 Write NT4 Bath Temperature to Display TOD TO BCD Source I 1 1 Dest 0 4 0 Rung 2 10
91. nfiguration x Slot 1 1746 NT 4 Analog 4 Ch Thermocouple Input OK Cancel Maximum Input Words 9 dl G File Length Edit G Data Maximum Output Words 8 Help Setup Scanned Input Words E Scanned Output Words E Interrupt Service Routine ISR kz MO Length M1 Length Configure 4 Press the Configure button This allows you to configure options for each channel The following dialog box appears 1746 NT4 Analog 4 Ch Thermocouple Input x Channel 1 Channel 2 Channel 3 Channel 4 Channel Enabled Input Type Temperature Units Type J v je 7 Filter Frequency Broken Input fi OHz Zero Data Format Engineering Units 7 Cancel Apply Help Publication 1746 UM007C EN P July 2004 Configuring the 1746 NT4 Module with RSLogix 500 E 3 The dialog box allows you to access the parameters for all channels Each tab has an identical menu with the parameters shown 1746 NT4 Analog 4 Ch Thermocouple Input J x Channel 1 Channel 2 Channel 3 Channel 4 Channel Enabled Input Type Type J Temperature Units C Broken Input Zero The following list provides the options for a parameter Parameter Channel Enabled Description Controls bit 11 of the configuration file and sets whether the channel is being used Input Type Sets bits 0 3 and sets the type of thermocouple being used Temperature Units
92. nnel used Examples For this example we only need one N10 0 2 Enter the configuration parameters from step 6 for channel 0 into integer N10 0 ara In this example all the bits of N10 0 will be zero except for the channel enable N10 0 11 Pana 3 Program an instruction in your ladder logic to copy the contents of N10 0 to output word 0 1 0 Example of Data Table for Integer File N10 address 15 data 0 address 15 data 0 N10 0 0000 1000 0000 0000 a E COP On power up the first pass bit E COPY FILE S 1 15 is set for one scan enabling 15 Source N10 0 the COPY instruction that transfers a one to bit 11 of channel configuration Dest 0 1 0 word 0 This enables the channel Length 1 Write the ladder program Reference Write the remainder of the ladder logic program that specifies how your thermocouple input data Chapter 5 will be processed for your application In this procedure the addressing reflects the location of Channel l the module as slot 1 Configuration Data and Status SLC 500 Controller Chapter 6 Data Files Ladder Programming Input wode Output Image Examples Address Chapter 8 Address I 1 0 Application 1 1 0 Word0 ChannelODataWord lt 0 0l ol o ol Of o ol ol ol ol ol o ol 0l 0 Examples 1 1 1 Word Channel 1 DataWord Bit 15 Variable Thermocouple Input Data Bit 0 1 2 Word2 Channel 2 DataWord Your l I 1 3 Word3 Channel 3 DataWord programming Channel 0 Status Word device user Channel
93. ock between terminals CJC B and CJC B the lug containing the thermistor should attach to the lowermost screw terminal CJC B i CJC Assembly Cy Thermistor Always attach red lug to the CJC terminal Bottom of Terminal Block Installation and Wiring 3 13 Thermocouple Calibration The thermocouple module is initially calibrated at the factory The module also has an auto calibration function Auto calibration compensates for offset and gain drift of the A D converter caused by temperature change within the module An internal high precision low drift voltage and system ground reference is used for this purpose No external user supplied device is required for autocalibration When an auto calibration cycle takes place the module s multiplexer is set to system ground potential and an A D reading is taken The A D converter then sets its internal input to the modules precision voltage source and another reading is taken The A D converter uses these numbers to compensate for system offset zero and gain span error Autocalibration of a channel occurs whenever a channel is enabled or when a change is made to its input type or filter frequency You can also command your module to perform an autocalibration cycle by disabling a channel waiting for the status bit to change state 1 to 0 and then re enabling that channel Several
94. of the slotted terminal block release screws Publication 1746 UM007C EN P July 2004 3 8 Installation and Wiring Publication 1746 UM007C EN P July 2004 Terminal Block Spare Part Catalog Number 1746 RT32 gt Release Screw CJC A CJC Assembly gt Channel 0 CJC A Channel 0 Shield Channel 1 Shield Channel 1 Shield Channel 2 Shield Channel 2 Shield Channel 3 CJC B CJC Assembly gt Channel 3 CJC B Analog Common see below Release Screw Replacing a Series A thermocouple module with a Series B module requires that the bottom right terminal which was SHIELD on Series A modules no longer be connected to CHASSIS GROUND if it was previously Use one of the other SHIELD terminals Wiring Considerations ATTENTION The possibility exists that grounded or exposed thermocouples can become shorted to a potential greater than that of the thermocouple itself Due to possible shock hazard care should be taken when wiring these types of thermocouples Refer to Appendix D for more details Follow the guidelines starting below when planning your system wiring e To limit noise keep thermocouple and millivolt signal wires as far away as possible from power and load lines Installation and Wiring 3 9 e To ensure proper operation and high immunity to electrical noise always use Belden 8761 shielded twisted pair
95. on Data and Status Channel Configuration The channel configuration word consists of bit fields the settings of Procedure which determine how the channel will operate This procedure looks at each bit field separately and helps you configure a channel for operation Refer to the chart on page 5 4 and the bit field descriptions that follow for complete configuration information Appendix B contains a configuration worksheet that can assist your channel configuration TIP When using RSLogix 500 version 6 10 or higher you can use the software s I O wizard to configure the NT4 channels Refer to Appendix E for more information 1 Determine the input device type J K etc thermocouple or mV for a channel and enter its respective 4 digit binary code in bit field 0 3 of the channel configuration word 2 Select a data format for the data word value Your selection determines how the analog input value from the A D converter will be expressed in the data word Enter your 2 digit binary code in bit field 4 5 of the channel configuration word 3 Determine the desired state for the channel data word if an open circuit condition is detected for that channel Enter the 2 digit binary code in bit field 6 7 of the channel configuration word 4 If the channel is configured for thermocouple inputs or the CJC sensor determine if you want the channel data word to read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit
96. or equivalent wire for millivolt sensors or shielded twisted pair thermocouple extension lead wire specified by the thermocouple manufacturer for the thermocouple type you are using Using the incorrect thermocouple extension wire type or not following the correct polarity convention will cause invalid readings e Special considerations for using the analog common ANALOG COM terminal based on thermocouple type See Appendix D for definitions of thermocouple types When using grounded thermocouple s jumper the ANALOG COM terminal to any single active grounded channel s plus or minus terminal When using exposed thermocouple s that have the thermocouple junction touching an electrically conductive material jumper the ANALOG COM terminal to any single active exposed channel s plus or minus terminal When using ungrounded shielded or exposed thermocouples that are not touching an electrically conductive material do not use the ANALOG COM terminal When using a mix of grounded ungrounded and exposed thermocouples jumper the ANALOG COM terminal to any single active grounded channel s plus or minus terminal If millivolt inputs are used the terminal should be handled as discussed on page 1 7 The Series A 1746 NT4 does not have an ANALOG COM terminal and cannot be used with multiple grounded and or exposed thermocouples that touch electrically conductive material The Series A c
97. or control The following example explains how to verify that channel configuration changes have taken effect Example Execute a dynamic configuration change to channel 2 of the thermocouple module located in slot 3 of a 1746 chassis and set an internal data valid bit when the new configuration has taken effect Program Listing Rung 2 0 Set up all four channels S 1 COP E COPY FILE 15 Source N10 0 Dest 0 3 0 Length 4 Rung 2 1 Set channel 2 to CJC MOV ere 5 MOVE 0 0 Source N10 4 Dest 0 3 2 Rung 2 2 Set channel 2 back to type K 1 1 0 B3 MOV 1 OSR MOVE 0 1 Source N10 2 Dest 0 3 3 2 Check that the configuration written to channel 2 is Rung 2 3 being echoed back in channel 2 s status word Data valid EQU B3 EQUAL Source A 1 3 6 3 Source B 0 3 2 Rung 2 4 END Data Table 15 data 0 address 15 data 0 0000 1001 0001 0001 N10 3 0000 1001 0001 0001 0000 1001 0001 0001 N10 4 0000 1001 0001 1111 0000 1001 0001 0001 Ladder Programming Examples 6 5 Interfacing to the PID The thermocouple module was designed to interface directly to the Instruction SLC 5 02 or later processor PID instruction without the need for an intermediate scale operation Example Use NT4 channel data as the process variable in the PID instruction 1 Select scaled for PID as the data type in
98. or that channel Enter the 2 digit binary code in bit field 6 7 of the channel configuration word Bits 6 and 7 Open Circuit Select 01 upscale 10 downscale 4 If the channel is configured for thermocouple inputs or the CJC sensor determine if you want the channel data word to read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit 8 of the configuration word If the channel is configured for a mV analog sensor enter a zero in bit 8 Bit 8 Temperature Units Select 0 degrees Celsius 1 degrees Fahrenheit 5 Determine the desired input filter for the channel and enter the 2 digit binary code in bit field 9 10 of the channel configuration word A smaller filter frequency increases the channel update time but also increases the noise rejection and channel resolution A larger filter frequency decreases the noise rejection but also decreases the channel update time and channel resolution Bits 9 and 10 Filter Frequency Select 00 10Hz 01 50Hz 10 60Hz 11 250Hz 6 If the channel will be used in your system it must be enabled Place a one in bit 11 if the channel is to be enabled Place a zero in bit 11 if the channel is to be disabled Bit 11 Channel Enable 0 channel disabled 1 channel enabled 7 Ensure that bits 12 15 contain zeros and then enter all the bit setting selected in previous steps to complete the configuration word Bits 12 15 0000 always make this setting 8 Build the channel
99. p 0 1428 F step 0 0198 C step 0 0357 F step 50 mV 0 1mV step 0 1mV step 0 01mV step 0 01mV step 6 104 mV step 6 104 mV step 1 526 mV step 1 526 mV step a 0 1mV step 0 1mV step 0 01mV step 0 01mV step 12 21 mV step 12 21 mV step 3 052 mV step 3 052 mV step A 1 C step 1 F step 0 1 C step 0 1 F step 0 0052 C step 0 0093 F step 0 0013 C step 0 0023 F step Publication 1746 UM007C EN P July 2004 5 10 Channel Configuration Data and Status Publication 1746 UM007C EN P July 2004 Select Open Circuit State Bits 6 and 7 The open circuit bit field lets you define the state of the channel data word when an open circuit condition is detected for that channel This feature is active for thermocouple input types millivolt input types and CJC device input An open circuit condition occurs when the thermocouple itself or its extension wire is physically separated or open This can happen if the wire gets cut or disconnected from the terminal block If either of the two CJC devices thermistors are removed from the module wiring terminal any input channel configured for either a thermocouple or CJC temperature input will be placed in an open circuit condition An input channel configured for millivolt input is not affected If zero is selected the channel data word is forced to 0 during an open circuit condition Selecting upscale forces the channel data word
100. r 5 Channel Configuration a ad ae Channel Configuration Procedure 33 6Ss pas cos 2 ea ws Select Input Type Bits 0 3 a cy kee Br a eee as Select Data Format Bits 4and5 Using Scaled for PID and Proportional Counts Scaling Examples peda a a AMO H Fea AUER we EE Select Open Circuit State Bits 6 and 7 Select Temperature Units Bit 8 so s ae Mikes Select Channel Filter Frequency Bits 9 and 10 Select Channel Enable Bit Tak beatae tse ed Unused Bits Bits 12 15 nur ha va RE ee RRS Channel Data Word etsia tea ours pot eee ete Channel Status Checking 00 045 h doce Gehl oar eu das Status Conditions eskan re palig Gah et Gad te abies gee ale Input Type Status Bits 0 3 aaau ee eK Data Format Type Status Bits 4 and 9 Open Circuit Type Status Bits 6 and 7 Temperature Units Type Status Bit 8 Channel Filter Frequency Bits 9 and 10 Channel Status Chis a trae ROI ees Open Circuit Error Bit 12 naaa aaa aaa Under Range Error Bit 13 aaau aana aaa Over Range Error Bit 14 aaa aaa a Configuration Error BiG IS aoaaa aasa aaa Chapter 6 Initial Prostim gains ik a KN es Procedure 54 65 Stee Dynamic Programming a he RO OEE Sh Verifying Channel Configuration Changes Interfacing to the PID Instruction yo a Monitoring Channel Status Bits Invoking Autocalibration oosa aaas aaa Mod
101. rd B ejg fs 5 E 5al jg S amp Ei Word 3 Channel 3 Data Word O S o S e S a Channel 0 Status Word _0 0 0 0 1 0 O 0 01 0 0 0 0 O Oj O d Channel 1 Status Word Bit15 Address Bit 0 Channel 2 Status Word 1 4 Word 7 Channel 3 Status Word For this example during normal operation only bit 11 is set Publication 1746 UM007C EN P July 2004 2 8 Quick Start for Experienced Users Publication 1746 UM007C EN P July 2004 Compliance to European Union Directives Chapter 3 Installation and Wiring This chapter provides e Compliance to European Union Directives e Electrostatic Discharge e NT4 Power Requirements e Module Location in Chassis e Module Installation and Removal e Terminal Wiring e Thermocouple Calibration If this product has the CE mark it is approved for installation within the European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive The Series B or higher 1746 NT4 is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file e EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment e EN 50082 2 EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Publication 1746 UM007C EN P J
102. s BCD data so the program must convert the temperature reading from the thermocouple module to BCD before sending it to the display This application will display the temperature in F Device Configuration 1746 0B16 1746 NT4 Thermocouple Type J Ps Bath LED Display DC sinking inputs BCD format Publication 1746 UM007C EN P July 2004 8 2 Application Examples Channel Configuration Configure the thermocouple channel with the following setup e type J thermocouple e F display to whole degree e zero data word in the event of an open circuit e 10 Hz input filter to reject high frequency noise and give good rejection of 60 Hz line noise Channel Configuration Worksheet With Settings Established for Channel 0 ABI AA NR 11 10 9 8 7 6 5 4 3 2 1 0 Bit Number 0 0 0 0 1 0 0 1 0 0 0 1 0 0 0j OJ Channel 0 0 0 0 0 Channel 1 0 0 0 0 Channel 2 0 0 0 0 Channel 3 A A A e Input Type Select e Data Format Select e Open Circuit Select e Temperature Units Select e Filter Frequency Select e Channel Enable ot Used Bits 0 3 Input Type Select 0000 J 0100 R 1000 50 mV 0001 K 0101 S 1001 100 mV 0010 T 0110 B 1111 CJC temperature 0011 E
103. s one of the following e 250 Hz Filter 82 ms e 60 Hz Filter 196 ms e 50 Hz Filter 226 ms e 10 Hz Filter 946 ms Publication 1746 UM007C EN P July 2004 4 10 Preliminary Operating Considerations Response to Slot Disabling Publication 1746 UM007C EN P July 2004 By writing to the status file in your modular SLC processor you can disable any chassis slot Refer to your programming device s manual for the slot disable enable procedure Always understand the implications of disabling a thermocouple module before using the slot disable feature Input Response When a thermocouple slot is disabled the thermocouple module continues to update its input image table However the SLC processor does not read inputs from a module that is disabled Therefore when the processor disables the thermocouple module slot the module inputs appearing in the processor image table remain in their last state and the module s updated image table is not read When the processor re enables the module slot the current state of the module inputs are read by the processor during the subsequent scan Output Response The SLC processor may change the thermocouple module output data configuration as it appears in the processor output image However this data is not transferred to the thermocouple module The outputs are held in their last state When the slot is re enabled the current data in the processor image is transferred
104. tatus information the channel must be enabled and the channel must have processed any configuration changes that may have been made to the configuration word Example To obtain the status of channel 2 input word 6 of the thermocouple module located in slot 4 in the SLC chassis use address 1 4 6 File Type i Word 4 6 Element Word Delimiter Delimiter Chapter 5 Channel Configuration Data and Status gives you detailed bit information about the content of the data word and the status word Publication 1746 UM007C EN P July 2004 4 4 Preliminary Operating Considerations Channel Filter Frequency Selection Publication 1746 UM007C EN P July 2004 The thermocouple module uses a digital filter that provides high frequency noise rejection for the input signals The digital filter is programmable allowing you to select from four filter frequencies for each channel The digital filter provides the highest noise rejection at the selected filter frequency Selecting a low value i e 10 Hz for the channel filter frequency provides the best noise rejection for a channel but it also increases the channel update time Selecting a high value for the channel filter frequency provides lower noise rejection but decreases the channel update time The following table shows the available filter frequencies associated minimum normal mode rejection NMR cut off frequency and step response for each filter frequency
105. the channel configuration word 2 Specify the thermocouple channel data word as the process variable for the PID instruction Program Listing Initialize NT4 Rung 2 0 First Pass Bit Channel 0 S 1 MOV MOVE 15 Source N10 0 R mm 2081 ung 2 g Channel 0 Dest 0 3 0 Status 0 I 3 4 PID PID 11 Control BlockN11 0 Process Variable T340 Control Variable N11 23 Rung 2 2 Control Block Length23 SCL SCALE __ Source N11 23 The Rate and Offset parameters should be set per your application The Dest Rate 10000 will typically be an analog output chan nel Refer to your programming device s offset user manual or Analog 1 0 Modules Rung 2 3 User Manual for specific examples of Dest the SCL instruction JEND Data Table address I5 data 0 address 15 data 0 N10 0 0000 1000 0010 0001 Publication 1746 UM007C EN P July 2004 6 6 Ladder Programming Examples Monitoring Channel Status Bits address N10 0 This example shows how you could monitor the open circuit error bits of each channel and set an alarm in the processor if one of the thermocouples opens An open circuit error can occur if the thermocouple breaks one of the thermocouple wires gets cut or disconnected from the terminal block or if the CJC thermistors are not installed or are damaged IMPORTANT If a CJC thermistor is not installed or is damaged all four alarms are set and all four channel LEDs blink Program Listing
106. the temperature setting is ignored Analog input data is the same for either Celsius or Fahrenheit 2 Type B thermocouple cannot be represented in engineering units x 1 Fahrenheit above 3276 7 Fahrenheit Software reats it as an over range error 1746 NT4 Thermocouple Module Channel Data Word Resolution Input Data Format Type Engineering Unitsx 10 Engineering Units x 1 Scaled for PID Proportional Counts Celsius Fahrenheit Celsius Fahrenheit Celsius Fahrenheit Celsius Fahrenheit J 1 C step 1 F step 0 1 C step 0 1 F step 0 0592 C step 0 1066 F step 0 0148 C step 0 0266 F step K 1 C step 1 F step 0 1 C step 0 1 F step 0 1001 C step 0 1802 F step 0 0250 C step 0 0450 F step il 1 C step 1 F step 0 1 C step 0 1 F step 0 0409 C step 0 0736 F step 0 0102 C step 0 0184 F step E 1 C step 1 F step 0 1 C step 0 1 F step 0 0775 C step 0 1395 F step 0 0194 C step 0 0349 F step R 1 C step 1 F step 0 1 C step 0 1 F step 0 1079 C step 0 1942 F step 0 0270 C step 0 0486 F step S 1 C step 1 F step 0 1 C step 0 1 F step 0 1079 C step 0 1942 F step 0 0270 C step 0 0486 F step B 1 C step 1 F step 0 1 C step 0 1 F step 0 0928 C step 0 1670 F step 0 0232 C step 0 0417 F step N 1 C step 1 F step 0 1 C step 0 1 F step 0 0793 C ste
107. tion The copper in the thermoelement is converted to nickel and zinc Because of the high thermal conductivity of Type TP thermoelements special care should be exercised in the use of the thermocouples to insure that both the measuring and reference junctions assume the desired temperatures ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type T commercial thermocouples be 2 percent between 101 and 59C 0 8C between 59 and 93C and 3 4 percent between 93 and 371C Type T thermocouples can also be supplied to meet special limits of error which are equal to one half the standard limits of error given above plus a limit of error of 1 percent is specified between 184 and 59C The recommended upper temperature limit for protected Type T thermocouples 371C applies to AWG 14 1 6mm wire For smaller wires it decreases to 260C for AWG 20 0 8mm and 240C for AWG 24 or 28 0 5 or 0 3mm TTT The Constantan element of Type J thermoelements is not interchangeable with the Constantan element of Types T or N due to the different ration of copper and nickel in each Nickel Chromium vs Copper Nickel lt Constantan gt Type E thermocouples are recommended by the ASTM Manual 1970 for use in the temperature range from 250 to 871C in oxidizing or inert atmospheres The negative thermoelement is subject to deterioration above about 871C but the thermoco
108. tion Glossary Publication AG 7 1 A D Refers to the analog to digital converter inherent to the NT4 thermocouple input module The converter produces a digital value whose magnitude is proportional to the instantaneous magnitude of an analog input signal attenuation The reduction in the magnitude of a signal as it passes through a system The opposite of gain channel Refers to one of four small signal analog input interfaces available on the module s terminal block Each channel is configured for connection to a thermocouple or DC millivolt mV input device and has its own diagnostic status word chassis A hardware assembly that houses devices such as I O modules adapter modules processor modules and power supplies CJC Cold Junction Compensation The means by which the module compensates for the offset voltage error introduced by the temperature at the junction between the thermocouple lead wire and the input terminal block the cold junction common mode rejection ratio The ratio of a device s differential voltage gain to common mode voltage gain Expressed in dB CMRR is a comparative measure of a device s ability to reject interference caused by a voltage common to its input terminals relative to ground CMRR 20 Logyg V1 V2 common mode voltage A voltage that appears in common at both input terminals of a differential analog input with respect to ground configuration word Contains the channel conf
109. to the thermocouple module Chapter 5 Channel Configuration Data and Status This chapter examines the channel configuration word and the channel status word bit by bit and explains how the module uses configuration data and generates status during operation This chapter includes e Channel Configuration e Channel Configuration Procedure e Channel Data Word e Channel Status Checking e Status Conditions Channel Configuration The channel configuration word is a part of the thermocouple module s output image as shown below Output words 0 3 correspond to channels 0 3 on the module Output words 4 7 are not used After module installation each channel must be configured to establish the way the channel operates e g thermocouple type J reading in C etc You configure the channel by entering bit values into the configuration word using your programming software Programming is discussed in chapter 6 Addressing is explained in chapter 4 Module Output Image Configuration Word en ghocgnigngionyos 9 8 amp 8 7 6 5 2 0 15 4 3 2 0 4 3 oy CLL T Fr a TT TTT 15 14 3 2 1 0 9 8 7 6 5 3 2 0 4 wo LI 111 1 Pecna LEIT T 15 4 13 2 10 9 8 7 6 5 3 2 1 0 4 ss a a moo T 15 4 13 2 10 9 8 7 6 5 3 2 0 4 0 e 4 l Not Used 0 e 7 The configuration word default setting is all zeros Publication 1746 UM007C EN P July 2004 5 2 Channel Configurati
110. tween the maximum and minimum specified analog thermocouple input values gain drift The change in full scale transition voltage measured over the operating temperature range of the module input data scaling The data formats that you select to define the logical increments of the channel data word These may be scaled for PID or Engineering Units for millivolt thermocouple or CJC inputs which are automatically scaled They may also be proportional counts which you must calculate to fit your application s temperature or voltage resolution local configuration A control system where all the chassis are located within several feet of the processor and chassis to chassis communication is via a 1746 C7 or 1746 C9 ribbon cable LSB Least Significant Bit Refers to a data increment defined as the full scale range divided by the resolution The bit that represents the smallest value within a string of bits multiplexer An switching system that allows several input signals to share a common A D converter normal mode rejection differential mode rejection A logarithmic measure in dB of a device s ability to reject noise signals between or among circuit signal conductors but not between equipment grounding conductor or signal reference structure and the signal conductors Glossary 3 remote configuration A control system where the chassis can be located several thousand feet from the processor chassis Chassis commun
111. ule Diagnostics and Troubleshooting Application Examples Specifications NT4 Configuration Worksheet Thermocouple Restrictions Table of Contents iii Chapter 7 Module Operation vs Channel Operation 7 1 Power up Diagnostics 0 0 00 7 1 Channel Diagnostics os fy kd Cees tet eG Sek ier ey 7 2 LEA OS u a Sk ae RAGA MO RA A ea bs 7 3 Channel Status LEDs Green a seksi eee Aer e ees 7 4 Invalid Channel Configuration 7 4 Open Circuit Detection 4 Oa det aes Cie ie Geese ad 7 4 Out Of Range DetechOte cv oe otev AK Oe PEERS 7 5 Module Status LED Green aa a ne oe peas 7 5 Troubleshooting Flowchart si abu ee ot anton tos 7 6 Replacement Parts oa peo MER AG ee A 7 7 Contacting Rockwell Automation 0 7 7 Chapter 8 Basic Example 6 fe oe he Prhep Hace Res 4 4 ase Oe RG hes eee 8 1 Application Setup Display a Temperature 8 1 Channel Coniisuratiotiesy ax 4 4iw awe ee Shee S Sed 8 2 Supplementary Example ss ju fig e bona e4 e heres a eee ae 8 4 Application Setup Four Channels C F 8 4 Device Configuration n ve tae e ew on eRe K RS 8 4 Channel Configuration aoaaa aasa 8 5 Program Setup and Operation Summary 8 7 Program Listing 0 0 0 0 ee ee 8 7 Appendix A Electrical Specifications cay ax 28 Dak Pe Re Ke oe4 A 1 Physical Specifications po 4 codex GH LOS oe w BASS A 2 Environmental Specifications 0 0 0 0
112. uly 2004 3 2 Installation and Wiring Electrostatic Discharge Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins Guard against electrostatic damage by observing the precautions listed next ATTENTION Electrostatic discharge can degrade performance or cause permanent damage Handle the module as A stated below e Wear an approved wrist strap grounding device when handling the module e Touch a grounded object to rid yourself of electrostatic charge before handling the module e Handle the module from the front away from the backplane connector Do not touch backplane connector pins e Keep the module in its static shield bag when not in use or during shipment NT4 Power Requirements The thermocouple module receives its power through the SLC500 chassis backplane from the fixed or modular 5 VDC 24 VDC chassis power supply The maximum current drawn by the module is shown in the table below 5V dc Amps 24V dc Amps 0 06 0 04 When you are using a modular system configuration add the values shown in the table above to the requirements of all other modules in the SLC chassis to prevent overloading the chassis power supply When you are using a fixed system controller refer to the important note about module compatibility in a 2 slot expansion chassis on page 3 3 Publication 1746 UM007C EN P July 2004 Installation and Wiring 3 3 Module Location in
113. uly 2004 Using Scaled for PID and Proportional Counts The thermocouple module provides eight options for displaying input channel data These are 0 1 F 0 1 C 1 F 1 C 0 01 mV 0 1 mV Scaled for PID and Proportional Counts The first six options represent real Engineering Units provided displayed by the 1746 NT4 and do not require explanation The Scaled for PID and Proportional Counts selections provide the highest NT4 display resolution but also require you to manually convert the channel data to real Engineering Units The equations on page 5 7 show how to convert from Scaled for PID to Engineering Units Engineering Units to Scaled for PID Proportional Counts to Engineering Units and Engineering Units to Proportional Counts To perform the conversions you must know the defined temperature or millivolt range for the channel s input type Refer to the Channel Data Word Format table on page 5 9 The lowest possible value for an input type is S oy and the highest possible value is SHIGH Channel Configuration Data and Status 5 7 Scaling Examples Scaled for PID to Engineering Units Equation Engr Units Equivalent Sow I SHIGH SLOW X Scaled for PID value displayed 16384 e Assume type J input type scaled for PID display type channel data 3421 e Want to calculate C equivalent e From Channel Data Word Format table Sow 210 C and SHIGH 760 C Solution Engr Units Equivalent 210 C
114. uple may be used up to 1000C for short periods The ASTM Manual 1970 indicates the following restrictions at high temperatures They should not be used in sulfurous reducing or alternately reducing and oxidizing atmospheres unless suitable protected with protecting tubes They should not be used in vacuum at high temperatures for extended times because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration They should also not be used in atmospheres that promote green rot corrosion those with low but not negligible oxygen content Thermocouple Restrictions C 5 S and R Type Thermocouples The negative thermoelement a copper nickel alloy is subject to composition changes under thermal neutron irradiation since the copper is converted to nickel and zinc ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for the Type E commercial thermocouples be 1 7C between 0 and 316C and 1 2 percent between 316 and 871C Limits of error are not specified for Type E thermocouples below OC Type E thermocouples can also be supplied to meet special limits of error which are less than the standard limits of error given above 1 25C between 0 and 316C and 3 8 percent between 316 and 871C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decreases to 649C for AWG 14 1 6mm 538C for
115. value to its full scale value during an open circuit condition The full scale value is determined by the selected input type and data format Selecting downscale forces the channel data word value to its low scale value during an open circuit condition The low scale value is determined by the selected input type and data format IMPORTANT You may receive up ramping data values from the time the open circuit condition occurs until the condition is flagged The NT4 requires 500 msec or one module update time whichever is longer to indicate the error Depending on your program scan rate ramping data may be written for several program scans after the open circuit occurs Channel Configuration Data and Status 5 11 Select Temperature Units Bit 8 The temperature units bit lets you select temperature engineering units for thermocouple and CJC input types Units are either degrees Celsius C or degrees Fahrenheit F This bit field is only active for thermocouple and CJC input types It is ignored when millivolt inputs types are selected If you use engineering units 1 mode and Fahrenheit temperature units i e 0 1 F the full scale temperature for thermocouple type B is not achievable with 15 bit numerical representation An over range error will occur for that channel if it tries to represent the full scale value The maximum representable temperature is 3276 7 F instead of 3308 F Select Channel Filter
116. with any particular device However millivolt applications often use bridges of strain gages To allow the NT4 Series B or higher to operate correctly the analog common ANALOG COM terminal of the module needs to be biased to a level within 2V of the signal of interest A resistive voltage divider using 10k Q resistors is recommended to accomplish this The circuit diagram below shows how this connection is made Strain Gage Bridge r 5 a A NT4 Se ae S22 gee A 1 fixed ZT variate i 10k Q INPUT O CHLO CHLI Q if CHL2 CHL3 i 10k Q i 1 11 fixed fixed 1 1 A 4 ANALOG COM S 1 1 a an an ee a Publication 1746 UM007C EN P July 2004 1 8 Overview Publication 1746 UM007C EN P July 2004 Required Tools and Equipment Chapter 2 Quick Start for Experienced Users This chapter can help you to get started using the NT4 4 channel thermocouple mV module The procedures are based on the assumption that you have an understanding of SLC 500 products You should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application Because it is a start up guide for experienced users this chapter does not contain detailed explanations about the procedures listed It does however reference other chapters in this book where you can get more information about applying t

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SLC™ 500 4-Channel Thermocouple/mV Input Module