National Instruments SCC-68 Manual de usuario

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USER GUIDE

SCC-68

I/O Connector Block with 4 SCC Signal Conditioning Slots for DAQ Devices

The SCC-68 is an I/O connector block for easy signal connection to a

National Instruments M Series or E Series DAQ device. The SCC-68

features screw terminals and a general breadboard area for I/O signal

connection, and bus terminals for external power and grounding. The

SCC-68 has four SCC slots for use in integrating thermocouple, strain

gauge, RTD input, frequency input, current input, voltage attenuator,

lowpass filter, load cell input, accelerometer, feedthrough, SPDT relay,

isolated digital I/O, and isolated voltage input SCC modules into the

measurement system.

Contents

Conventions ............................................................................................ 3

Using the SCC-68 Enclosure .................................................................. 4

Opening the Enclosure..................................................................... 4

Closing the Enclosure ...................................................................... 5

Stacking and Wall Mounting ........................................................... 6

Installing Rubber Feet...................................................................... 7

Connecting to the DAQ Device .............................................................. 8

Using the SCC-68 with 16 AI Channel M Series Devices .............. 8

Using the SCC-68 with 32 AI Channel M Series Devices .............. 8

Using the SCC-68 with a 68-Pin E Series Device ........................... 9

Using the SCC-68 with the NI 6025E, NI 6033E, or NI 6071E...... 10

SCC-68 Features ..................................................................................... 11

Screw Terminals .............................................................................. 12

Device Pinouts .......................................................................... 12

Wiring to Screw Terminals....................................................... 12

Integrated Strain Relief.................................................................... 12

SCC Modules................................................................................... 13

Breadboard Area .............................................................................. 13

Using the Temperature Sensor for Cold-Junction

Compensation (CJC) ..................................................................... 14

Cold Junction Temperature Measurement Accuracy ............... 15

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SCC-68 User Guide 2 ni.com

Bus Terminals...................................................................................15

Power Supply....................................................................................16

Using SCC Modules with the SCC-68 ....................................................16

Supported SCC Modules ..................................................................17

Connecting Signals to SCC Modules in the SCC-68 .......................17

Power Supply Considerations...........................................................19

LED ...........................................................................................20

Installing the SCC Modules in the SCC-68......................................21

SCC Connector Pinouts.............................................................21

Direct Access to SCC signals....................................................23

Analog Input Measurement Considerations ............................................23

Differential .......................................................................................24

Single-Ended ....................................................................................24

Non-Referenced Single Ended (NRSE) ...........................................25

Grounded Signal Sources ..........................................................25

Floating Signal Sources.............................................................26

Ground-Referenced Single Ended (RSE).........................................26

Grounded Signal Sources ..........................................................26

Floating Signal Sources.............................................................26

Taking Measurements with NI-DAQmx .................................................27

Configuring the SCC-68...................................................................28

Configuring the SCC-68 as an SCC Carrier..............................28

Configuring the SCC-68 as a Screw Terminal Accessory ........28

Configuring Channels and Tasks......................................................29

Configure a Task .......................................................................29

Configure Global Virtual Channels...........................................31

Using Your Task in an Application..................................................32

Specifications...........................................................................................33

Quick Reference Guides ..........................................................................38

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©National Instruments Corporation 3 SCC-68 User Guide

Conventions

The following conventions are used in this manual:

<> Angle brackets that contain numbers separated by an ellipsis represent

a range of values associated with a bit or signal name—for example,

AO <3..0>.

»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 select Options

from the last dialog box.

This icon denotes a note, which alerts you to important information.

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, refer to the Read Me First: Safety and Radio-Frequency

Interference document, shipped with the product, for precautions to take.

When symbol is marked on a product, it denotes a warning advising you to

take precautions to avoid electrical shock.

When symbol is marked on a product, it denotes a component that may be

hot. Touching this component may result in bodily injury.

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.

italic Italic text denotes variables, emphasis, a cross-reference, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word

or value that you must supply.

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.

SCC-XX This name refers to any SCC module.

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SCC-68 User Guide 4 ni.com

Using the SCC-68 Enclosure

Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting/disconnecting any signal wires.

Figure 1. SCC-68 Parts Locator Diagram

Opening the Enclosure

To open the SCC-68, use a flathead screwdriver to loosen the captive screw

at the front of the device. After the screw is loosened, pull up on the front

of the enclosure cover to open. The top half of the SCC-68 enclosure can

be removed completely.

1SCCSlots

2 Screw Terminals

3 68-Pin I/O Connector

4EnclosureCover

5 Quick Reference Guide

6 Enclosure Base

7 External Power Screw Terminal

8 External Power Switch

9 Strain Relief Wire Entry

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©National Instruments Corporation 5 SCC-68 User Guide

Closing the Enclosure

To close the SCC-68, align the two back tabs into the corresponding holes

at the back of the base, as shown in the detail in Figure 2. With the cover

and base of the enclosure aligned, snap the SCC-68 closed. To secure the

SCC-68 enclosure, use a flathead screwdriver to push the screw down

against the spring resistance and tighten the screw.

Caution The captive screw must be used to secure the enclosure when connecting

hazardous voltage (>30 Vrms/42.4 Vpk/60 VDC) signals to an SCC-RLY01 module.

Note For safest operation of the SCC-68, NI recommends always using the captive screw

to keep the SCC-68 in a closed position.

Figure 2. SCC-68 Enclosure Features

1 Strain Relief Posts

2 Snapping Latches

3 Captive Screw

4 Hinge Tabs

5 Strain-Relief Holes for Cable Ties

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SCC-68 User Guide 6 ni.com

Stacking and Wall Mounting

The SCC-68 has grooves on the bottom of the enclosure that allow the

device to be stacked on top of other SCC-68 connector blocks.

Note The SCC-68 cannot be securely stacked onto another SCC-68 if the rear rubber feet

are attached.

The SCC-68 also has mounting holes on the bottom of the device for secure

wall-mounting. The third mounting hole allows you to mount the SCC-68

onto a wall sideways or inverted. Refer to Figures 3 and 4 for more

information about the location and use of these enclosure features.

Figure 3. SCC-68 Mounting Dimensions

1 Mounting Holes

2 Directional Mounting Hole

3 I/O Connector Cable

24.46 cm

(9.63 in.)

17.78 cm

(7.00 in.)

17.78 cm

(7.00 in.)

12.70 cm

(5.00 in.) 2.54 cm

(1.00 in.)

12.70 cm

(2.50 in.)

3.51 cm

(1.38 in.)

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©National Instruments Corporation 7 SCC-68 User Guide

Installing Rubber Feet

Rubber non-skid feet are shipped with the device that can be attached for

secure desktop use. To install the rubber feet, remove adhesive backing and

affix to the SCC-68 where indicated in Figure 4.

Figure 4. SCC-68 Mounting Features

1 Rubber Feet

2 Wall-Mounting Holes

3 Stacking Grooves

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SCC-68 User Guide 8 ni.com

Connecting to the DAQ Device

The following sections describe how to connect the SCC-68 to the DAQ

device. The SCC-68 is designed to be used with M Series and E Series

DAQ devices only. Other 68-pin devices may not function properly with

the SCC-68.

Using the SCC-68 with 16 AI Channel M Series Devices

To use the SCC-68 with a 16 AI channel M Series device, complete the

following steps:

1. Attach the quick reference guide, shown in Figures 21 and 22, to the

top of the SCC-68 enclosure as shown in Figure 1. The quick reference

guide for Connector 0 (included in the SCC-68 kit) shows the pin

assignments of the SCC-68 and other useful information.

2. Attach the SCC-68 to the DAQ device using one of the following

cables:

• SHC68-68-EPM

• SHC68-68

• RC68-68

3. Proceed to the Taking Measurements with NI-DAQmx section for

information about using the SCC-68 in measurement applications.

Note Some M Series devices are available with a 37-pin connector. The SCC-68 cannot

be used with these devices.

Using the SCC-68 with 32 AI Channel M Series Devices

The 32 AI channel M Series DAQ device has two connectors.

• Connector 0 (AI 0-15)

• Connector 1 (AI 16-31)

The SCC-68 can be used with Connector 0 or Connector 1.

To use the SCC-68 with a 32 AI channel M Series device using

Connector 0, complete the following steps:

1. Attach the quick reference guide, shown in Figures 21 and 22, to the

top of the SCC-68 enclosure as shown in Figure 1. The quick reference

guide for Connector 0 (included in the SCC-68 kit) shows the pin

assignments of the SCC-68 and other useful information.

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©National Instruments Corporation 9 SCC-68 User Guide

2. Attach the SCC-68 to Connector 0 of the DAQ device using one of the

following cables:

• SHC68-68-EPM

• SHC68-68

• RC68-68

3. Proceed to the Taking Measurements with NI-DAQmx section for

information about using the SCC-68 in measurement applications.

To use the SCC-68 with a 32 AI channel M Series device using

Connector 1, complete the following steps:

1. Attach the SCC-68 to Connector 1 of the DAQ device using one of the

following cables:

• SHC68-68-EPM

• SHC68-68

• RC68-68

2. Refer to Figure 22 in the Quick Reference Guides section for the quick

reference guide for the SCC-68 connected to Connector 1 of the DAQ

device. The guide shows the pin assignments of the SCC-68 and other

useful information. Attach a copy of this guide to the top of the

SCC-68 enclosure as shown in Figure 1.

Using the SCC-68 with a 68-Pin E Series Device

To use the SCC-68 with a 68-pin E Series device, complete the following

steps:

1. Attach the SCC-68 to the DAQ device using one of the following

cables:

• SH68-68-EP

• R68-68

2. Refer to Figure 23 in the Quick Reference Guides section for the quick

reference guide for the SCC-68 connected to the E Series DAQ device.

The guide shows the pin assignments of the SCC-68 and other useful

information. Attach a copy of this guide to the top of the SCC-68

enclosure as shown in Figure 1.

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