National Instruments Isolated Analog Input Modules SCC-AI01 Manuale utente

USER GUIDE

SCC-AI Series Isolated Analog

Input Modules

The SCC-AI Series isolated analog input modules (SCC-AIXX) can extract

a relatively low-amplitude input signal from a high-common-mode voltage

so the E Series DAQ device can measure the input signal. They also can

amplify and filter the input signal, resulting in higher measurement

resolution and accuracy.

SCC-AIXX modules are available in a range of gains from 0.2 to 200. They

contain lowpass filters of either 10 kHz or 4 Hz bandwidth. Table 1-1 gives

the gain and bandwidth for each module.

Table 1-1. SCC-AIXX Module Input/Output Range, Gain, and Bandwidth

Model Input Range Output Range Gain Bandwidth

SCC-AI01 ±42 V ±8.4 V 0.2 10 kHz

SCC-AI02 ±20 V ±10 V 0.5 10 kHz

SCC-AI03 ±10 V ±10 V 110 kHz

SCC-AI04 ±5 V ±10 V 210 kHz

SCC-AI05 ±1 V ±10 V 10 10 kHz

SCC-AI06 ±100 mV ±10 V 100 10 kHz

SCC-AI07 ±50 mV ±10 V 200 10 kHz

SCC-AI13 ±10 V ±10 V 14 Hz

SCC-AI14 ±5 V ±10 V 24 Hz

SCC-AI Series Isolated Analog Input Modules 2 ni.com

Conventions

The following conventions are used in this guide:

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

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

ai<0..7>.

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 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. This font 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, and code excerpts.

SC-2345 SC-2345 refers to both the SC-2345 connector block and the SC-2345

configurable connector.

SCC SCC refers to any SCC series signal conditioning module.

What You Need to Get Started

To set up and use the SCC-AIXX, you need the following items:

❑SC-2345 with one of the following:

–SCC-PWR01

– SCC-PWR02 and the PS01 power supply

– SCC-PWR03 (requires a 7 to 42 VDC power supply, not included)

©National Instruments Corporation 3 SCC-AI Series Isolated Analog Input Modules

❑One or more SCC-SGXX

❑SCC-SG Series Strain-Gauge Modules User Guide

❑SC-2345 User Manual

❑Read Me First: Safety and Radio-Frequency Interference

❑SC-2345 Quick Reference Label

❑68-pin Basic or E Series DAQ device, documentation,

and 68-pin cable

❑1/8 in. flathead screwdriver

❑Numbers 1 and 2 Phillips screwdrivers

❑Wire insulation strippers

❑NI-DAQ (current version) for Windows 2000/NT/XP/Me

Note Software scaling of measurements is not supported on the Macintosh operating

system. Refer to the Scaling Voltage Measurements section.

Unpacking the Module

SCC modules are shipped in antistatic envelopes to prevent electrostatic

damage (ESD) to the modules. ESD can damage several components on

these products.

Caution Never touch the exposed pins of connectors.

To avoid damage from ESD when you handle the module, take the

following precautions:

• Ground yourself by using a grounding strap or by touching a grounded

object.

• Touch the antistatic envelope to a metal part of the computer chassis

before removing the module from the envelope.

Remove the module from the envelope and inspect the module for loose

components or any sign of damage. Notify NI if the module appears

damaged in any way. Do not install a damaged module.

Store the module in the antistatic envelope when it is not in use.

SCC-AI Series Isolated Analog Input Modules 4 ni.com

Installing the Module

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

before removing equipment covers or connecting/disconnecting any signal wires

A blue label stripe identifies the SCC-AIXX as an analog input module.

The label also displays the icon shown in Figure 1-1.

Figure 1-1. SCC-AIXX Icon

You can plug the SCC-AIXX into any analog input socket on the SC-2345.

The socket you choose determines which E Series DAQ device channels

receive the SCC-AIXX signals.

For single-stage input conditioning, plug the SCC-AIXX into any socket

J(X+1), where Xis 0 to 7, and connect the input signals to the module as

described in the Connecting the Input Signals section.

If you use the SCC-AIXX in a dual-stage configuration, the SCC-AIXX

must be the first-stage module. Plug it into any socket J(X+9) and plug the

second-stage SCC into socket J(X+1), where Xis 0 to 7. Connect the input

signals to the SCC-AIXX as described in the Connecting the Input Signals

section. The SC-2345 connects the output signals of the first-stage SCC to

the inputs of the second-stage SCC. An example of dual-stage conditioning

is an SCC-AI02 followed by an SCC-FV01 frequency input module.

Sockets J9 to J16 are also available for digital input/output (DIO)

conditioning or control. Refer to the SC-2345 User Manual for more

information on configuring, connecting, and installing SCC modules.

©National Instruments Corporation 5 SCC-AI Series Isolated Analog Input Modules

Connecting the Input Signals

The SCC-AIXX has a fixed screw-terminal receptacle and a removable

screw-terminal block, as shown in Figure 1-2.

Figure 1-2. SCC-AIXX Two-Part Screw-Terminal System

After you install the SCC-AIXX, connect the input signals to the removable

screw-terminal block of the module.

1. Remove power from the signal lines.

2. Strip 7 mm of insulation from the ends of the signal wires.

3. Insert the wires into the screw terminals.

4. Tighten the screws to 0.5 to 0.6 N · m (4.4 to 5.3 lb - in.) of torque.

Each screw terminal is labeled by pin number <1..4>. Pins 1 and 2 form a

channel routed to E Series DAQ device channel X+8, and pins 3 and 4 form

a channel routed to the E Series DAQ device channel X, where Xis 0 to 7

depending on the socket where you plug in the module. The SCC-AIXX

provides channel-to-ground and module-to-module isolation only. It does

not provide isolation between the two channels of the SCC-AIXX. Because

both channels must have the same reference voltage, pins 1 and 3 are

connected together internally. Figure 1-3 shows the SCC-AIXX signal

connections.

1 SCC Screw-Terminal Receptacle 2 Removable Screw-Terminal Block

SCC-AI Series Isolated Analog Input Modules 6 ni.com

Figure 1-3. SCC-AIXX Signal Connections

The inputs are designed in a floating (nonreferenced) single-ended

configuration. If the measured signals are floating, connect the negative

input pins, 1 and 3, to AISENSE on the SC-2345 terminal block through

a10kΩto 100 kΩresistor. Figure 1-4 shows a floating signal connection

on one channel of the SCC-AIXX.

Figure 1-4. Nonreferenced Signal Connection for the SCC-AIXX (One Channel)

Lowpass

Filter

–

Lowpass

Filter

E Series DAQ Device

Signal

Source

ACH(

)

SCC-AI

AISENSE

AIGND

ACH(

+8)

Lowpass

Filter

–

Lowpass

Filter

E Series DAQ Device

Signal

Source ACH(

)

SCC-AI

AISENSE

AIGND

ACH(

+8)

AISENSE

on SC-2345

terminal block

10–100 kΩ

©National Instruments Corporation 7 SCC-AI Series Isolated Analog Input Modules

If a high common-mode voltage is present, connect the negative input pins,

1 and 3, to the signal reference. Figure 1-5 shows a ground-referenced

signal connection on one channel of the SCC-AIXX.

Figure 1-5. Ground-Referenced Signal Connection for the SCC-AIXX

with High Common-Mode Voltage (One Channel)

Configuring the SCC System

Measurement & Automation Explorer (MAX) Configuration

Run MAX to configure the SCC system. Complete one of the following

sets of steps depending on the version of NI-DAQ used in your application.

NI-DAQmx

Complete the following steps to configure the SCC-AI module using

NI-DAQmx.

1. Open Measurement & Automation Explorer.

2. Right-click Devices and Interfaces and select Create New.

3. Under NI-DAQmx SCC Connector Block select SC-2345. Click

Finish.

Lowpass

Filter

–

Lowpass

Filter

E Series DAQ Device

Signal

Source ACH(

)

SCC-AI

AISENSE

AIGND

ACH(

+8)

High

CMV

–

SCC-AI Series Isolated Analog Input Modules 8 ni.com

4. In the SCC Connector Block Configuration window, configure the

SCC system as follows:

a. Specify the SCC Carrier Type. The location of the SCC sockets

change depending on the SCC carrier type.

b. Select the DAQ Device that is connected to the SC-2345.

c. Type the SCC Connector Block ID. The default value is SCC1.

d. In the J21 drop-down list next to Power, select the correct

SC-2345 power configuration. Refer to the SC-2345 User Manual

for information on power configurations.

e. For each SCC module physically installed in the SC-2345, add a

corresponding entry in the SC-2345 configuration window. To add

the SCC, click the socket drop-down list and select the correct

module. If the module name does not appear in the list, either the

module is not allowed in that location or you do not have the

current version of NI-DAQ. If you do not have the current version

of NI-DAQ, download it from ni.com.

f. Click OK after completing all SCC entries to complete the

configuration process.

5. Close MAX.

Note Configuring the SCC system using MAX automatically sets the E Series DAQ

device analog input mode to nonreferenced single-ended (NRSE).

Traditional NI-DAQ

Complete the following steps to configure the SCC-AI module using

Traditional NI-DAQ.

1. Open Measurement & Automation Explorer.

2. Expand Devices and Interfaces.

3. Expand Traditional NI-DAQ Devices.

4. Right-click the E Series DAQ device connected to the SC-2345,

and select Properties.

5. Select the Accessory tab.

6. Under Accessory,select SC-2345.

7. Click the Configure button. A new window appears listing the sockets

(connector reference designators) of the SC-2345.

8. Select the SC-2345 socket where you installed an SCC.

9. Click Add and select the SCC you installed. If the module name does

not appear in the list, either the module is not allowed in that location

or you do not have the current version of NI-DAQ. If you do not have

the current version of NI-DAQ, download it from ni.com.

©National Instruments Corporation 9 SCC-AI Series Isolated Analog Input Modules

10. If you make a selection mistake, select the socket and click Remove.

11. Repeat steps 8 and 9 for each newly installed SCC.

12. Click OK after completing all SCC entries.

13. Click OK to complete the configuration process and close MAX.

Note Configuring the SCC system using MAX automatically sets the E Series DAQ

device analog input mode to nonreferenced single-ended (NRSE).

Virtual Channels, Physical Channels, and Tasks

After you have installed and configured your SCC hardware, you can use

software tools within MAX to further configure the module and take

measurements.

Creating an NI-DAQmx Task or Global Channel

To create an NI-DAQmx task or global channel, complete the following

steps.

1. Open Measurement & Automation Explorer.

2. Right-click Data Neighborhood and select Create New.

3. Select NI-DAQmx Task or NI-DAQmx Global Channel and click

Next.

4. Select Analog Input and then select Vol tag e.

5. If you are creating a task, select the channels to add to the task. You can

select blocks of channels by pressing the <Shift> key while making the

selections or select individual channels by pressing the <Ctrl> key

while making the selections. If you are creating a channel, you can

select only one channel. Click Next.

6. Enter a name for the task or global channel and click Finish.

7. In the Channel List box, select the channel(s) you want to configure.

You can select blocks of channels by pressing the <Shift> key while

making the selections or select individual channels by pressing the

<Ctrl> key while making the selections.

8. Enter the specific values for your application in the Settings tab.

Context help information for each setting is provided on the right side

of the screen.

SCC-AI Series Isolated Analog Input Modules 10 ni.com

Table 1-2 shows suggested values for some of the parameters. Use default

values for parameters not shown.

9. Click Test to test the channel. You should be able to view your

measurement in the window that appears.

You have finished configuring the NI-DAQmx task or global channel.

Creating a Virtual Channel in Traditional NI-DAQ

To create a Traditional NI-DAQ virtual channel, complete the following

steps.

1. Open Measurement & Automation Explorer.

2. Right-click Data Neighborhood and select Create New.

3. Select Traditional NI-DAQ Virtual Channel and click Finish.

4. Click Next to select Analog Input as the type of channel to configure.

5. Select Voltage from the drop-down list and click Next.

6. Enter the rest of the values as they apply to your setup and click Next.

7. On the next screen, specify information about the E Series DAQ device

being used and click Finish.

8. To test the channel, click Test .

You have finished configuring the Traditional NI-DAQ virtual channel.

Table 1-2. SCC-AIXX Suggested Values

Module Input Range

SCC-AI01 ±42 V

SCC-AI02 ±20 V

SCC-AI03 ±10 V

SCC-AI04 ±5 V

SCC-AI05 ±1 V

SCC-AI06 ±100 mV

SCC-AI07 ±50 mV

SCC-AI13 ±10 V

SCC-AI14 ±5 V

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