National Instruments IMAQ SCB-100 Bedienungsanleitung

INSTALLATION GUIDE

SCB-100

100-Pin Female SCSI to 100-Pin Female Screw Terminal, Desktop

Mount Terminal Block

This document describes how to connect and use the SCB-100 with 100-pin data acquisition

(DAQ) devices and lists specifications. The SCB-100 is a shielded I/O connector block with

100 screw terminals for easy signal connection to the following NI devices and modules:

• Digital I/O (DIO)—NI 6508, NI 6509, NI 6511, NI 6512, NI 6513, NI 6514, NI 6515,

NI 6527, NI 6528, NI 6529, PCI-DIO-96

• Counter/Timer—NI 6624

• Multifuntion I/O (MIO)—NI 6025E, NI 6031E, NI 6033E, NI 6071E

• Other devices with a 100-pin 0.050 series shielded D-type I/O connector

Note To use the SCB-100 with a digital I/O or counter/timer device, you must

change the default switch setting. Refer to Using the SCB-100 with Digital I/O and

Counter/Timer Devices for more information.

Figure 1. SCB-100 Parts Locator Diagram

1. Quick Reference Label (Optional)

2. Top Cover

3. Connector Screw

4. Grounding Screw

5. 100-Pin I/O Connector

6. Enclosure Base

7. Strain-Relief Bar

8. Strain-Relief Screw

9. SCB-100 Board Assembly

Contents

Icons.......................................................................................................................................... 2

Safety Guidelines...................................................................................................................... 2

Electromagnetic Compatibility Guidelines...............................................................................3

What You Need to Get Started..................................................................................................4

Getting Started with the SCB-100............................................................................................ 5

Using the SCB-100 with Digital I/O and Counter/Timer Devices............................................6

Using the SCB-100 with Multifunction I/O Devices................................................................7

Connecting Nonreferenced or Floating Signal Sources to Analog Inputs........................ 9

Connecting Ground-Referenced Signal Sources to Analog Inputs.................................10

Using the SCB-100 for Thermocouple Measurements .................................................. 10

Removing the Board .............................................................................................................. 12

Soldering, Desoldering, and Cutting Via Traces on the SCB-100 Board .............................. 12

Specifications.......................................................................................................................... 12

Where to Go Next................................................................................................................... 15

Worldwide Support and Services............................................................................................ 15

Icons

Notice—Take precautions to avoid data loss, loss of signal integrity, degradation of

performance, or damage to the model.

Caution—Take precautions to avoid injury. Consult the model documentation for

cautionary statements when you see this icon printed on the model. Cautionary

statements are localized into French for compliance with Canadian requirements.

Shock Warning—Take precautions to avoid electrical shock.

Safety Guidelines

The following cautions contain important safety information concerning hazardous voltages

and connector blocks.

Caution The protection provided by the model can be impaired if it is used in a

manner not described in the user documentation.

Attention La protection apportée par le modèle risque d'être endommagée s'il est

utilisé d'une autre façon que celle décrite dans la documentation utilisateur.

Caution Do not connect hazardous voltages (>30 V RMS/42 V peak/60 V DC).

Refer to your product documentation for information about the electrical limits of

your device or module.

2| ni.com | SCB-100 Installation Guide

Attention Ne pas connecter à des tensions dangereuses (> 30 Veff/42 Vpic/

60 VCC). Reportez-vous à la documentation de votre produit pour plus

d'informations sur les limites électriques de votre appareil ou module.

Caution Install cover prior to use. To avoid electrical shock, do not remove

SCB-100 covers unless you are qualified to do so. Before removing the cover,

disconnect any live circuit from the connector block. Replace cover for use.

Attention Installez le capot de protection avant l'utilisation. Pour éviter tout choc

électrique, ne retirez pas le capot de protection du SCB-100, sauf si vous êtes

qualifié pour le faire. Avant de retirer le capot de protection, déconnectez tout circuit

sous tension du bloc de connexion. Remettez en place le capot de protection avant

l'utilisation.

Notice The grounding screws on your SCB-100 are for grounding high-impedance

sources, such as a floating source (1 mA maximum) and for terminating the shields

of connected cables. Do not use the grounding screws as safety earth ground.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits for

electromagnetic compatibility (EMC) as stated in the product specifications. These

requirements and limits are designed to provide reasonable protection against harmful

interference when the product is operated in its intended operational electromagnetic

environment.

This product is intended for use in residential, commercial, and industrial locations. However,

harmful interference may occur in some installations or when the product is connected to a

peripheral device or a test object. To minimize interference with radio and television reception

and prevent unacceptable performance degradation, install and use this product in strict

accordance with the instructions in the product documentation.

Furthermore, any changes or modifications to the product not expressly approved by National

Instruments could void your authority to operate it under your local regulatory rules.

Notice To ensure the specified EMC performance, operate this product only with

shielded cables and accessories.

Notice To ensure the specified EMC performance, signal wires routed outside of

the enclosure must be contained within a shielded cable and connected to shielded

accessories. Cable shields must be terminated to the chassis ground lug using as

short a connection as is practical.

SCB-100 Installation Guide | © National Instruments | 3

What You Need to Get Started

• SCB-100

• (Optional) Quick reference label PDF

Note You can find quick reference labels, which specify accessory pinout

information for many compatible devices, by going to ni.com/r/scb100labels.

• 100-pin DAQ device and device documentation

• Cable for your device:

– SH100M-100M Flex cable (formerly known as SH100-100-F), part number

185095-0x, for digital I/O and counter/timer devices

– SH100M-100M cable (formerly known as SH100100), part number 182853-0x, for

multifunction I/O devices

• Phillips #1 and #2 screwdrivers

• 14 AWG to 26 AWG wire

• Wire cutters

• Wire insulation strippers

• 1/8 in. flathead screwdriver

4| ni.com | SCB-100 Installation Guide

Getting Started with the SCB-100

Figure 2. SCB-100 Board Parts Locator Diagram

1. Switches S4, S5, and S6

2. 100-Pin I/O Connector

3. Board Mount Screw Hole

4. Signal Accessory Power LED (DS1)

5. Switches S1, S2, and S3

6. Screw Terminals

7. Breadboard Area

8. Vias Shorted to Screw Terminal

9. Cold-Junction Compensation Temperature Sensor

Complete the following steps while referring to the previous figures. If you have not already

installed your DAQ device or module, refer to the getting started guide that came with your

device for instructions. Remove all cables from the SCB-100 before getting started.

1. Remove the grounding screws on either side of the top cover with a Phillips #1

screwdriver. Open the top cover.

2. (Optional) Attach the quick reference label to the inside of the cover. To find quick

reference labels for most compatible devices, go to ni.com/r/scb100labels.

SCB-100 Installation Guide | © National Instruments | 5

3. Configure switches for the signal types you are using, as explained in Using the SCB-100

with Digital I/O and Counter/Timer Devices or Using the SCB-100 with Multifunction I/O

Devices.

4. Loosen the strain-relief bar by removing the strain-relief screws with a #2 Phillips

screwdriver.

5. Connect the wires to the screw terminals by stripping off ¼ in. of the wire insulation,

inserting the wires into the screw terminals, and securely tightening the screws with the

flathead screwdriver to a torque of 0.5 N⋅m to 0.6 N⋅m (4 in.⋅lb to 5 in.⋅lb).

6. Reinstall the strain-relief (if removed) and tighten the strain-relief screws. If the shielded

cable is too large to route through the strain-relief hardware, either use multiple,

smaller-diameter cables or remove the top strain-relief bar and add insulation or padding

if necessary to constrain the cable.

7. Reinsert the grounding screws to ensure proper shielding.

8. Replace the cover.

9. Connect the SCB-100 to the device using the cable.

10. Launch Measurement & Automation Explorer (MAX). In the left panel, expand Devices

and Interfaces to confirm that your DAQ device or module is recognized, and then

configure your device settings.

11. (Optional) Configure the DAQ device or module connected to the SCB-100 by

completing the following steps.

a. In MAX, right-click your DAQ device or module and select Configure.

b. Configure the device or module properties and click OK.

12. Test specific device functionality. Run a Test Panel in MAX by right-clicking your DAQ

device or module and selecting Test Panels. Click Start to test the device or module

functions.

Note When you have finished using the SCB-100, power off any external signals

connected to the SCB-100 before you power off your computer.

Using the SCB-100 with Digital I/O and

Counter/Timer Devices

Digital I/O (NI 65xx) devices, counter/timer (NI 66xx) devices, and DAQ devices without

analog input functionality must use the direct feedthrough mode. Move the switches to the

direct feedthrough mode switch setting as shown in the following table.

6| ni.com | SCB-100 Installation Guide

Table 1. Digital I/O and Counter/Timer Devices Switch Setting

Switch Setting Description

S6 S5 S4

Direct feedthrough mode—Move switches S1, S2, S3, S4, S5,

and S6 to the positions shown on the left. In this mode:

• All 100 signals from the DAQ device connect directly to

screw terminals

• The signal accessory power LED (DS1) does not light in this

configuration.

Refer to the following figure for a detailed diagram.

Figure 3. Direct Feedthrough Mode Switch Setting

Temperature

Sensor

DAQ Device Cable SCB-100 Screw

Terminal

100

LED

S6 S5 S4

Refer to your device documentation for device signal information.

Using the SCB-100 with Multifunction I/O

Devices

You can take measurements with the SCB-100 and multifunction I/O (NI 60xxE) devices in a

number of ways. The SCB-100 has a temperature sensor for cold-junction compensation to

accommodate thermocouples. Switches S4, S5, and S6 configure the temperature sensor for

different analog input settings. The following table shows the different switch settings for

multifunction I/O devices.

SCB-100 Installation Guide | © National Instruments | 7

Table 2. Multifunction I/O Device Switch Settings

Switch Setting Description

S6 S5 S4

MIO with disabled temperature sensor mode (default

configuration)—Move switches S1, S2, S3, S4, S5, and S6 to the

positions shown on the left. In this mode:

• The temperature sensor is not used.

• AI 0 and AI 8 are available on screw terminals.

• The signal accessory power LED (DS1) lights when the

device is powered and connected to the SCB-100.

Refer to the following figure for a detailed diagram.

S6 S5 S4

MIO with single-ended temperature sensor mode—Move

switches S1, S2, S3, S4, S5, and S6 to the positions shown on the

left. In this mode:

• The temperature sensor can be read using AI 0 in referenced

single-ended (RSE) mode.

• AI 8 is available on a screw terminal.

• The signal accessory power LED (DS1) lights when the

device is powered and connected to the SCB-100.

Refer to the following figure for a detailed diagram.

S6 S5 S4

MIO with differential temperature sensor mode—Move

switches S1, S2, S3, S4, S5, and S6 to the positions shown on the

left. In this mode:

• The temperature sensor can be read using AI 0 and AI 8 in

differential mode.

• The signal accessory power LED (DS1) lights when the

device is powered and connected to the SCB-100.

Refer to the following figure for a detailed diagram.

S6 S5 S4

Direct feedthrough mode—You can use direct feedthrough

mode with a multifunction I/O device.

Refer to Using the SCB-100 with Digital I/O and Counter/Timer

Devices for configuration information and a detailed diagram.

8| ni.com | SCB-100 Installation Guide

Figure 4. MIO Device Modes Switch Settings

Temperature

Sensor

DAQ Device Cable SCB-100

LED

Screw

Terminal

100

+5 V

AI 0

AI 8

Other

Pins

Refer to your device documentation for device signal information.

Connecting Nonreferenced or Floating Signal Sources

to Analog Inputs

A floating signal source is a signal source that is not connected in any way to the building

ground system but has an isolated ground-reference point or isolated output. Some examples

of floating signal sources are outputs for the following: thermocouples, transformers, battery-

powered devices, optical isolators, and isolation amplifiers. The ground reference of a floating

signal source must be tied to the ground of the device to establish a local or onboard reference

for the signal. If this reference is not established, erratic readings from the board will occur.

•Differential Inputs—To provide a return path for the instrumentation amplifier bias

currents, floating signal sources must have a 10 kΩ to 100 kΩ resistor connected to the

AI GND signal line on one input if DC-coupled, or both inputs if AC-coupled. For

detailed information on connections to floating signal sources and differential inputs,

refer to your device documentation.

•Single-Ended Inputs—When measuring floating signal sources, configure the

multifucntion I/O device for referenced single-ended (RSE) input to supply a ground

reference. In this configuration, the negative input of the device instrumentation amplifier

SCB-100 Installation Guide | © National Instruments | 9

is tied to the analog ground. For detailed information on connections to floating signal

sources and single-ended inputs, refer to your device documentation.

Connecting Ground-Referenced Signal Sources to

Analog Inputs

A grounded signal source is connected in some way to the building system ground; therefore,

the signal source is already connected to a common ground point with respect to the device

(assuming the host computer is plugged into the same power system). Nonisolated outputs of

instruments and devices that plug into the building power system fall into this category.

•Differential Inputs—Ground-referenced signal sources do not require special

components added to the SCB-100 board. For detailed information about connections to

ground-referenced signal sources and differential inputs, refer to your device

documentation.

•Single-Ended Inputs—When measuring ground-referenced signals, the external signal

supplies its own reference ground point; the device should not supply one. Configure the

device for nonreferenced, single-ended (NRSE) input mode. In this configuration, all of

the signal grounds should be tied to AI SENSE, which connects to the negative input of

the instrumentation amplifier on the device. Referencing the signal to AI GND can cause

inaccurate measurements resulting from an incorrect ground reference. For detailed

information on connections to ground-referenced signal sources and single-ended inputs,

refer to your device documentation.

Using the SCB-100 for Thermocouple Measurements

The maximum voltage level generated by thermocouples is typically a few millivolts.

Therefore, for best resolution, use an multifunction I/O device with a high gain.

Thermocouples can be measured in either differential or single-ended configurations:

•Differential Inputs—Differential configuration has better noise immunity than

single-ended configuration. You must install bias resistors when the device is set for

differential mode; the device must have a ground reference because thermocouples are

floating signal sources.

•Single-Ended Inputs—Single-ended configuration has twice as many inputs as

differential configuration. Configure the device for referenced single-ended (RSE) inputs.

Cold-junction compensation with the SCB-100 is accurate only if the temperature sensor

reading is close to the actual temperature of the screw terminals. Therefore, when reading

thermocouples, keep the SCB-100 away from drafts or other temperature gradients such as

those caused by heaters, radiators, fans, and warm equipment.

Optional Input Filtering and Broken Thermocouple Detection

To reduce noise, you can build a simple RC lowpass filter in the breadboard area.

Build broken-thermocouple-detection circuitry by connecting a high-value resistor between

the positive input and +5 V. The value of this resistor is relatively unimportant; a few

10 | ni.com | SCB-100 Installation Guide

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