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National Instruments SCC-CO20 manual

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Table of contents for the manual

  • Page 1

    USER GUIDE SCC-CO20 Isolated Current Output Module The SCC-CO20 is an isolated curren t output module that output s up to 20 mA. The output current lev el is proportional to the voltage applied to the module by an analog output channel of an E/M Series D A Q device. Conventions The following conventions are used in this guide: < > Angle brack[...]

  • Page 2

    SCC-CO20 Isolated Cu rrent Output Module User Guide 2 ni.com italic Italic text denotes variables, emphasis , a cross-reference, or an introduction to a key concept. Italic te xt also deno tes text that is a placeholder for a word or v alue that you must supply . monospace T e x t in this font denotes text or ch aracters that you should enter from [...]

  • Page 3

    © National Instruments Corpor ation 3 SCC-CO20 Isolated Curren t Output Module User Guide ❑ T o ols – 1/8 in. flathead scre wdri ver – Numbers 1 and 2 Phillips screwdriv er s – W ire insu lation stripper Note Software scaling of measurements is not supported on the Macintosh operating system. Refer to the SCC-CO20 Module Pin Assignments se[...]

  • Page 4

    SCC-CO20 Isolated Cu rrent Output Module User Guide 4 ni.com Figure 1. SCC-CO20 Sign al Connections to E/M Series DAQ Device Using the Isolated Loop Supply of the SCC-CO20 You can connect the SCC-CO20 to a load using either the isolated internal loop supply or an external supply. Th e internal loop supply outputs a voltage of 15 V with respect to t[...]

  • Page 5

    © National Instruments Corpor ation 5 SCC-CO20 Isolated Curren t Output Module User Guide Note If your load is g rounded and you are usin g the internal supply , connect the load ground to the current sink terminal at pin 2 on th e SCC-CO20. Do not connect the load ground to the isolated ground terminal because do ing so could defeat the module is[...]

  • Page 6

    SCC-CO20 Isolated Cu rrent Output Module User Guide 6 ni.com Figure 3. Connecting T wo SCC-CO20 Module s to a Higher-R esistance Load SCC-CO20 1 2 + – 15 V iso 3 SCC-CO20 1 2 + – 15 V iso 3 Load SUPPL Y SINK ISO GND SUPPL Y I I[...]

  • Page 7

    © National Instruments Corpor ation 7 SCC-CO20 Isolated Curren t Output Module User Guide Using an External Loop Supply In order for the current sink to oper ate properly with an external loop supply, the voltage must be within the range of 3 to 42 V. If the voltage is too high, overheating can occur and damage the module. Figure 4 shows four conf[...]

  • Page 8

    SCC-CO20 Isolated Cu rrent Output Module User Guide 8 ni.com Figur e 5. Connecting the SCC-CO20 to a Grounded External Loop Supply and a Grounded Load For information about how to conf igu re the SCC-CO20 modul e using NI-D A Qmx, refer to the SCC Quick Start Guide . Calibrating Gain and Offset Errors The SCC-CO20 is calibrated at the f actory befo[...]

  • Page 9

    © National Instruments Corpor ation 9 SCC-CO20 Isolated Curren t Output Module User Guide Note Normally you would adjust to 0 μ A in order to calibrate the of fset, but because the SCC-CO20 cannot source current, it is impossi ble to know when you ha ve adjusted past 0 μ A. Using the SCC-CO20 The SCC-CO20 is a 0 to 20 mA pr ogrammable current si[...]

  • Page 10

    SCC-CO20 Isolated Curr ent Output Module User Guide 10 ni.com Specifications These ratings are typical at 25 ° C unless otherw ise stated. Electrical Number of output channels ................. ....1 Output referencing .............. ................ ....Nonreferenced (floating) Input range .......................... ........... .........0 to 10 V[...]

  • Page 11

    © National Instruments Corporat ion 11 SCC-CO20 Isolated Curren t Output Module User Guide Physical Figure 6. SCC-CO20 Dimensions Weight .................... .............. ........... ....... 28 g (1.0 oz) I/O connectors ...................... .............. .... One 20-pin right-angle male connector One 3-pin screw terminal Field-wiring diameter[...]

  • Page 12

    SCC-CO20 Isolated Curr ent Output Module User Guide 12 ni.com Environmental Operating temperature .. .............. ............0 to 50 °C Storage temperature .............. .............. ....–20 to 70 °C Humidity .............. ............ .............. .........10 to 90% RH, noncondensing Maximum altitude ................. .............. .[...]

  • Page 13

    © National Instruments Corporat ion 13 SCC-CO20 Isolated Curren t Output Module User Guide Online Product Certification Refer to the product Declaration of Conformity (DoC) fo r additional regulatory compliance information. To obtain pro duct certifications an d the DoC for this product, visit ni.com/certification , search by model number or produ[...]

  • Page 14

    SCC-CO20 Isolated Curr ent Output Module User Guide 14 ni.com SCC-CO20 Module Pin Assignments Figure 7 shows the I/O connector pin s on the bottom of the modul e. Figure 7. SCC-CO20 Bottom View T able 1 lists the signal connect ion corresponding to each pin. 1P i n 1 2P i n 2 3 PWB Ke y 4 P i n 1 9 5P i n 2 0 Table 1. SCC-CO20 Pin Signal Connection[...]

  • Page 15

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