cb-27t, tbx-68t, and cb-68t isothermal terminal blocks installation guide
Contents
1. 1 Cover 5 SW1 SW2 Switches 2 Cover Opening 6 3 External Power Screw Terminals 7 4 3 Switch 8 Signal Wires DIO Selectable Connector Buffered Digital Output Connector 9 Screw Terminals 10 S1 S2 Switches 11 Cover Screws Figure 3 TBX 68T Parts Locator Diagram Screw Terminals 1 S2 Switches DIO Combo Connector Footprint for Optional DIO Selectable Connector Footprint for Optional Buffered Digital Output Connector akWN OOND Breadboard Area SW1 SW2 Switches S3 Switch External Power Screw Terminals Figure 4 CB 68T Parts Locator Diagram CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 8 ni com Connecting the TBX 68T CB 27T and CB 68T to the NI 435X 3 Note To minimize the temperature gradient inside the terminal block and thus maintain its isothermal nature for accurate cold junction compensation place the terminal block away from extreme temperature differentials Refer to Figures 5 6 and 7 as you complete the following steps to connect the terminal block to the NI 435X connector 1 Attach one end of the cable to the NI 435X device 2 Attach the other end of the cable to the terminal block On the CB 27T use the ejector ears to lock the cable connector in place On the TBX 68T and CB 68T if you use the SH6868 cable the two connectors snap together The R6868 ribbon cable has no latches and simply joins together without a snap To disconnec2. Connecting the Signals to the TBX 68T CB27T and CB 6ST section of this document 10 Replace the top cover B Note To enable direct cabling on the CB 68T to an accessory in the same CA 1000 enclosure you can optionally install two standard vertical 50 pin connectors on the CB 68T in the locations provided Do not connect an accessory to the external accessory connector if you are using the internal accessory connector CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 4 ni com 1 Half Panelette 3 Custom Panelette 4 CB 68T 6 Blank Panelettes 2 Top Cover for CB 68T 5 Oval Slot 7 Rear Panel Figure 1 Installing the CB 68T National Instruments Corporation 5 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Connecting the Signals to the TBX 68T CB27T and CB 68T UN Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires Refer to Figures 2 3 and 4 as you complete the following steps to connect the signals to the terminal block 1 Remove the CB 27T or TBX 68T terminal block cover by unscrewing the four cover screws using the Phillips screwdriver 2 Remove the front panel of the CB 27T 3 Use wire cutters and wire insulation strippers to strip 6 mm 25 in from the end of the signal wires to connect them to the screw terminals 4 Loosen the screws in the screw terminals with a 1 8 in
3. NI PCI 4351 Q NI 435X User Manual CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 2 ni com L CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Installation Guide D Read Me First Safety and Radio Frequency Interference D One of the following isothermal terminal blocks NI PCMCIA 4350 e CB 27T isothermal terminal block NI USB 4350 NI PXI 4351 and NI PCI 4351 e TBX 68T isothermal terminal block e CB 68T isothermal terminal block Q One of the following cable assemblies NI PCMCIA 4350 e PSH32 30F shielded cable NI USB 4350 NI PXI 4351 and NI PCI 4351 e SH6868 shielded cable recommended e R6868 ribbon cable Tie wraps for CB 27T installation only 1 8 in flathead screwdriver Wire cutters Q Q Q Number 1 Phillips screwdriver Q Q Wire insulation strippers For the CB 68T only Q CA 1000 accessory enclosure UO CA 1000 Configurable Connector Accessory Enclosure Installation Guide For digital signal conditioning only Q Digital signal conditioning accessory and its documentation Q NB7 or NB8 cable as required National Instruments Corporation 3 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Installing the CB 68T into the CA 1000 Enclosure UN Caution Refer to the Read Me First Safety and Radio Frequency Interference document before removing equipment covers or connecting disconnecting any signal wires Refer to Figure 1 as you complete the
4. flathead screwdriver 5 Insert the stripped wires into the screw terminals Tighten the screw terminals with the 1 8 in flathead screwdriver ay Note If you use digital signal conditioning accessories on the TBX 68T or CB 68T lock the cable connectors in place with the ejector ears 6 Make sure the signal wires can exit through the CB 27T or TBX 68T terminal block cover panel opening On the CB 27T you can use tie wraps to tie the wires to the strain relief tabs On the CB 68T you can use a strain relief panelette or wire the signals to a variety of available connector panelettes Many connector panelettes are available including thermocouple connectors BNC connectors and banana jacks Refer to the CA 000 Configurable Connector Accessory Enclosure Installation Guide for more information 3 Note The TBX 68T and CB 68T terminal blocks do not provide strain relief for signal wires Add strain relief and insulation for the signal wires if necessary 7 Replace the front panel of the CB 27T 8 Replace the terminal block cover and tighten the cover screws CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 6 ni com 1 Cover 6 Screw Terminals 2 Front Panel 7 Strain Relief Tabs 3 Cover Panel Opening 8 Cover Screws 4 Signal Wires 9 1 S2 Switches 5 Tie Wrap 10 Ejector Ears Figure 2 CB 27T Parts Locator Diagram National Instruments Corporation 7 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks
5. select Options from the last dialog box The symbol indicates that the following text applies only to a specific product a specific operating system or a specific software version This icon denotes a note which alerts you to important information gt g This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on the product see the Read Me First Safety and Radio Frequency Interference document shipped with the product for precautions to take bold Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes parameter names monospace Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions and code excerpts italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply What You Need to Get Started You need the following to set up and use the accessories Q One of the following NI 435X devices NI PCMCIA 4350 or NI USB 4350 NI PXI 4351 or
6. 0 South Africa 11 805 8197 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2528 7227 United Kingdom 01635 523545 INN 321613D 01 Oct02
7. CB 68T Isothermal Terminal Blocks 12 ni com Rack Mounting the TBX 68T or CB 68T When you have completed signal connections and terminal block installation you can mount the TBX 68T assembly into the rack If you are using the National Instruments TBX rack mount assembly refer to the TBX Rack Mount Kit Installation Guide for instructions If you are not using this rack mount assembly mount the TBX assembly directly onto the DIN rail by snapping the TBX 68T bottom onto the DIN rail with a firm push To remove the TBX 68T from the DIN rail place a flathead screwdriver into the slot above the terminal block base and pry it away from the rail If you are using the CB 68T refer to the CA 1000 Configurable Connector Accessory Enclosure Installation Guide for instructions Ss Note You cannot mount the CB 27T onto a rack Using the Current Source You can use the current sources on the NI 435X devices to provide excitation for RTDs thermistors and other resistors Follow the instructions in the NI 435X User Manual to connect the signals The screw terminals on the terminal block labeled IEX IEX0 IEX1 TEX IEX0 and IEX1 provide external access to this current source TEX IEX0 and IEX1 are the current outputs and IEX IEX0 and IEX1 are the current returns To enable external access of the current source IEX or IEXO push both slide switches S1 and S2 shown in Figures 2 and 3 to the ON position 3 Note
8. J CB 27T TBX 68T ano CB 68T ISOTHERMAL TERMINAL BLocks INSTALLATION GUIDE This installation guide describes how to install and connect signals to the CB 27T TBX 68T and CB 68T isothermal terminal blocks for use with the NI 435X products which includes the NI USB 4350 for computers that are USB compatible NI PCMCIA 4350 for computers that are PCMCIA compatible NI PXI 4351 for PXI and CompactPCI chassis and NI PCI 4351 for PCI bus computers The CB 27T isothermal terminal block is a shielded board with screw terminals that connects to the NI PCMCIA 4350 input output I O connector The TBX 68T isothermal terminal block is a DIN rail mountable terminal block that consists of a shielded board with screw terminals and digital signal conditioning accessory connections It connects to the I O connector on the NI USB 4350 NI PXI 4351 and NI PCI 4351 The CB 68T isothermal terminal block is a CA 1000 enclosure mountable terminal block that consists of a shielded board with screw terminals and digital signal conditioning accessory connections It connects to the I O connector on the NI USB 4350 NI PXI 4351 and NI PCI 4351 The terminals blocks can easily accommodate thermocouples resistance temperature detectors RTDs thermistors and voltage signals The terminal blocks feature isothermal construction to minimize the temperature gradients across the screw terminals and a high accuracy thermistor cold junction temperature sensor for me
9. To measure the cold junction temperature sensor while you are not using the current source externally through IEX and IEX push the slide switches S1 and S2 to the OFF position IEX and IEX are equivalent to IEX0 and IEX0 on the TBX 68T and CB 68T National Instruments Corporation 13 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Cold Junction Temperature Sensor The CB 27T TBX 68T and the CB 68T cold junction temperature sensors consist of a precision thermistor powered by the 25 uA current excitation source on the NI 435X device At 25 C the resistance of the thermistor is 5 000 Q The thermistor resistance varies from 16 305 to 1 492 Q over a 0 55 C temperature range The corresponding sensor output voltage varies from 408 37 mV over this temperature range To select and read the temperature sensor refer to the software documentation for programming information Alternatively you can use the following formulas to convert the cold junction sensor voltage to cold junction temperature TCC Tg 273 15 where Tx is the temperature in kelvin 2 1 Tk e e ge ee a blnR c ln R7 where a 1 295361 x 10 3 b 2 343159 x 10 4 c 1 018703 x 10 7 Rpr resistance of the thermistor in ohms T F EE 32 where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively 3 Note When you have configured the NI 435X device with the correct accessory in M
10. asuring with thermocouples Enclosures keep out air currents to maintain an isothermal environment for the screw terminals and the cold junction sensor The TBX 68T mounts on most European standard DIN EN mounting rails The TBX 68T and CB 68T also have connectors for cables from selected relay and digital signal conditioning modules The terminal blocks provide connections to all digital I O DIO lines on the NI 435X devices The terminal blocks also provide connections to all except two analog input channels CH CHO is dedicated for the National Instruments NI ni ccom and NI DAQ are trademarks of National Instruments Corporation Product and October 2002 company names mentioned herein are trademarks or trade names of their respective companies For patents covering 321613D 01 National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD orni com patents yN NATIONAL 1997 2002 National Instruments Corp All rights reserved INSTRUMENTS cold junction sensor and CH1 is dedicated for auto zeroing circuitry Refer to the NI 435X User Manual for further details on these two channels Conventions The following conventions are used in this guide The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and
11. easurement amp Automation Explorer NI DAQ can automatically perform cold junction compensation on measurements taken on thermocouple channels CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 14 ni com Using Digital Signal Conditioning Accessories You can connect the TBX 68T and the CB 68T to up to two of the following accessories at one time e SSR 8 channel backplane for use with SSR Solid State Relay Series digital signal conditioning modules e SC 206X Series digital signal conditioning boards e ER 8 electromechanical relay accessory Use one of the following cable assemblies to connect these accessories to the TBX 68T or CB 68T Refer to Table 1 for connection information e Use the NB8 ribbon cable for the SSR 8 channel backplane Refer to the SSR Series Modules and Backplanes User Guide for more information e Use the NB7 ribbon cable for the SC 206X Series digital conditioning boards and the ER 8 electromechanical relay accessory Refer to the SC 206X Series User Manual and the ER 8 16 User Manual for more information Table 1 Configuration Guide for the TBX 68T and CB 68T Digital Signal Conditioning Connector Function Accessory Cable Nonbuffered Individual Input SC 2060 8 optically isolated digital inputs NB7 Line Switch Selectable SSR 8 8 solid l NBS Input Output 5 solid state input relays Output ER 8 8 low cost electromechanical relays NB7 SC 2061 8 optically isolated digita
12. following steps to install the CB 68T into the CA 1000 enclosure 1 Remove the top cover of the CA 1000 by unscrewing the eight screws with a Phillips screwdriver 2 Remove the rear panel of the CA 1000 enclosure by unscrewing the four screws at the top of the panel using a Phillips screwdriver 3 Remove one of the half panelettes either the left or the right by removing the screw at the top of the panelette If installing two CB 68T units remove both half panelettes 3 Note The CA 1000 holds up to two CB 68T units or one CB 68T unit and one digital signal conditioning accessory 4 Install the custom panelette provided with the CB 68T on the side that the half panelette was removed from in step 3 5 Insert the CB 68T in the CA 1000 enclosure so that the 68 pin connector comes through the opening in the custom panelette Attach the CB 68T with the screws provided 6 Place the washer on the screw and screw it into the oval slot in the CB 68T board 7 Install up to five blank panelettes in the rear of the CA 1000 enclosure to fill openings Tighten the screws with a Phillips screwdriver 8 Install the desired connector panelettes in the front of the CA 1000 enclosure Many connector panelettes are available including thermocouple connectors BNC connectors and banana jacks Refer to the CA 1000 Configurable Connector Accessory Enclosure Installation Guide for more information 9 Connect the signal wires as directed in the
13. l outputs NB7 SC 2062 8 electromechanical relays NB7 Buffered Output Output ER 8 8 low cost electromechanical relays NB7 SC 2061 8 optically isolated digital outputs NB7 SC 2062 8 electromechanical relays NB7 SSR 8 8 solid state output relays NB8 Refer to Figures 3 and 4 to locate the following e A 26 pin individual channel switch selectable SW1 and SW2 buffered output nonbuffered I O connector e 26 pin buffered output connector e Switch selectable S3 NI 435X external 5 V power source for accessories screw terminal J15 National Instruments Corporation 15 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Refer to Figures 8 and 9 for switch settings DIO Screw Terminal DIOn O NI 435X 68 Pin Connector Buffered Digital Output Connector DOn o gt DIO Selectable Connector SDIOn BUFF OUT DIO Non Buffered I O Switch Position Buffered Output Switch Position 3 Figure 8 DIO Selectable Connector Switches SW1 and SW2 on the TBX 68T and CB 68T Note Digital input accessories attached to the DIO SELECTABLE connector control the state of the corresponding digital lines of the BUFFERED DIGITAL OUTPUT connector PWR 435X PWR 435X 5 V from NI 435X O 5 V from External Source at J15 5 V EXT 5 V EXT Figure 9 Switch Selectable 5 V Powe
14. om Electromagnetic Compatibility EMCIEM Licensen CE C Tick and FCC Part 15 Class A Compliant Electromagnetic emissions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Electromagnetic immunity eee Evaluated to EN 61326 1997 A1 1998 Table 1 3 Note For full EMC compliance you must operate this device with shielded cabling In addition all covers and filler panels must be installed Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product click Declaration of Conformity at ni com hardref nsf This Web site lists the DoCs by product family Select the appropriate product family followed by your product and a link to the DoC appears in Adobe Acrobat format Click the Acrobat icon to download or read the DoC FCC Regulatory Compliance Statements are contained in the Read Me First Safety and Radio Frequency Interference document for this product Technical Support Resources NI Web Support National Instruments Web support is your first stop for help in solving installation configuration and application problems and questions Online problem solving and diagnostic resources include frequently asked questions knowledge bases product specific troubleshooting wizards manuals drivers software updates and more Web support is available through the Technical Support section of ni com Worldwide Support National In
15. r Source for Accessories CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 16 ni com Figures 10 and 11 show the pin assignments for the DIO selectable and buffered digital output 26 pin connectors PWR 435X 5 V EXT 1 2 DGND PWR 435X 5 V EXT 3 4 DGND PWR 435X 5 V EXT 5 6 DGND PWR 435X 5 V EXT 7 8 DGND Buffered DO 7 9 10 DGND Buffered DO6 11 12 DGND Buffered DO5 13 14 DGND Buffered DO 4 15 16 DGND Buffered DO 3 17 18 DGND Buffered DO 2 19 20 DGND Buffered DO 1 21 22 DGND Buffered DOO 23 24 DGND PWR 435X 5 V EXT 25 26 DGND Figure 10 26 Pin Buffered Digital Output Connector Pin Assignments PWR 435X 5 V EXT 1 2 DGND PWR 435X 5 V EXT 3 4 DGND PWR 435X 5 V EXT 5 6 DGND PWR 435X 5 V EXT 7 8 DGND DIO 7 Buffered DIO7 9 10 DGND DIO 6 Buffered DIO6 11 12 DGND DIO 5 Buffered DIO5 13 14 DGND DIO 4 Buffered DIO4 15 16 DGND DIO 3 Buffered DIO3 17 18 DGND DIO 2 Buffered DIO 2 19 20 DGND DIO 1 Buffered DIO 1 21 22 DGND DIO 0 Buffered DIOO 23 24 DGND PWR 435X 5 V EXT 25 26 DGND Figure 11 26 Pin DlO Selectable Connector Pin Assignments National Instruments Corporation 17 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks Specifications Cold junction temperature SENSO ACCULACY ooo eeeeseseeses
16. seseseseteteeees 0 06 C from 15 to 35 C 0 2 C from 0 to 15 C and 35 to 55 C Isothermal accuracy s es 0 1 C Compatible DIN rails ee DIN EN 50 022 DIN EN 50 035 Terminal block dimensions CBO cnet acc 11 7x7 0 x 2 3 cm 4 6 x 2 75 x 0 9 in TBX 8T cianiar 16 28 x 12 57 x 8 43 cm 6 41 x 4 95 x 3 32 in CB O8T ss haa een 16 7 x 16 5 x 3 2 cm 6 6 x 6 5 x 1 25 in Max working voltage signal common mode eeeeeeeee Each input should remain within 42 V of ground Digital Output Specifications Safety Max non buffered digital I O 04 8 mA source 8 mA sink Max buffered digital output 15 mA source 64 mA sink The CB 27T TBX 68T and CB 68T are designed to meet the requirements of the following standards for safety and electrical equipment for measurement control and laboratory use e EN 61010 1 IEC 61010 1 e UL3111 1 UL3121 1 e CAN CSA C22 2 No 1010 1 Includes only the thermistor accuracy The combined effects of the temperature sensor accuracy as well as the current source tolerances due to tolerances in all component values in the NI 435X devices the effects caused by temperature and loading and self heating and current leakage are discussed in the NI 435X User Manual 2 Refer to the NI 435X maximum working voltage specification use the lower number of the two 3 Refer to the NI 435X User Manual CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 18 ni c
17. struments has offices located around the world to help address your support needs You can access our branch office Web sites from the Worldwide Offices section of ni com Branch office Web sites provide up to date contact information support phone numbers email addresses and current events National Instruments Corporation 19 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks If you have searched the technical support resources on our Web site and still cannot find the answers you need contact your local office or National Instruments corporate For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 China 86 21 6555 7838 Czech Republic 02 2423 5774 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 01 42 96 427 Hong Kong 2645 3186 India 91 80 4190000 Israel 03 6393737 Italy 02 413091 Japan 03 5472 2970 Korea 02 3451 3400 Malaysia 603 9596711 Mexico 001 800 010 0793 Netherlands 0348 433466 New Zealand 09 914 0488 Norway 32 27 73 00 Poland 22 3390 150 Portugal 210 311 210 Russia 095 238 7139 Singapore 65 6 226 5886 Slovenia 3 425 420
18. t the cable from the CB 27T and accessories from the TBX 68T or CB 68T press outward on the ejector ears the cable will pop out To disconnect the SH6868 cable from the TBX 68T or CB 68T push the two ejector ears on the backshell of the cable and gently pull on the backshell Do not pull the cable UN Caution The connectors of both the NI 435X device and the cable are keyed for correct attachment Do not force the cable when inserting it into or removing it from the NI 435X connector National Instruments Corporation 9 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 1 Portable Computer 4 PSH32 30F Shielded Cable 6 Signal Wires 2 PCMCIA Slot 5 CB 27T 7 NI PCMCIA 4350 I O Connector 3 NI PCMCIA 4350 Figure 5 Connecting the CB 27T Cable Assembly CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks 10 ni com 1 SH6868 Shielded Cable Shown or R6868 Ribbon Cable 4 TBX 68T 2 NB7 Ribbon Cable Shown or NB8 Ribbon Cable 5 Ejector Ears 3 Signal Wires 6 NI 435X USB PXI PCI Figure 6 Connecting the TBX 68T Cable Assembly National Instruments Corporation 11 CB 27T TBX 68T and CB 68T Isothermal Terminal Blocks NI 435X USB PXI PCI 4 NB7 Ribbon Cable Shown or NB8 Ribbon Cable Ejector Ears 5 Signal Wires SH6868 Shielded Cable Shown 6 CB 68T or R6868 Ribbon Cable On Figure 7 Connecting the CB 68T Cable Assembly CB 27T TBX 68T and
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