National Instruments BNC-9920 Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

BNC-9920

Connector Accessory for C Series Modules

This document describes how to install, configure, and use the BNC-9920 accessory with C Series

modules. This document also contains accessory specifications.

The BNC-9920 has the following features:

• Eight BNC connectors for analog input (AI) connection

• Onboard temperature reference

• Thermocouple connector

• Resistor measurement screw terminals

• Two BNC connectors for analog output (AO) connection

• Eight screw terminals with state indicators for digital I/O (DIO) connection

• 12 screw terminals for additional DIO connection

• One BNC connector for DIO connection

• Two user-defined BNC connectors

• A function generator with the following outputs:

– Frequency-adjustable, TTL-compatible square wave

– Frequency- and amplitude-adjustable sine wave or triangle wave

• Quadrature encoder

• A 68-pin I/O connector that connects to three C Series modules using the BNC-9920 cable

• Can be used on a desktop or mounted on a DIN rail

Contents

Conventions ......................................................................................................................................... 2

What You Need to Get Started ............................................................................................................ 2

Installing the BNC-9920...................................................................................................................... 2

Connecting Analog Input Signals ........................................................................................................ 4

Connecting Differential Analog Input Signals ............................................................................ 4

Measuring Floating Signals ................................................................................................. 5

Measuring Ground-Referenced Signals............................................................................... 5

Measuring Temperature............................................................................................................... 6

Measuring Resistance .................................................................................................................. 6

Connecting Analog Output Signals ..................................................................................................... 7

Using the Function Generator.............................................................................................................. 7

Connecting User-Defined Signals ....................................................................................................... 7

Connecting Digital I/O Signals............................................................................................................ 8

Using the Quadrature Encoder..................................................................................................... 8

Specifications....................................................................................................................................... 9

Environmental Management........................................................................................................12

Where to Go for Support ..................................................................................................................... 13

BNC-9920 Operating Instructions and Specifications 2 ni.com

Conventions

The following conventions are used in this document:

<> 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 Options»Settings»General directs you to pull down the Options menu, select

the Settings item, and select General 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 a product, refer to the Read Me First: Safety

and Electromagnetic Compatibility document for information about 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.

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.

What You Need to Get Started

To set up and use your BNC-9920 accessory, you need the following:

❑NI CompactRIO Starter Kit

❑CompactRIO controller and chassis or CompactRIO integrated controller and chassis1

Installing the BNC-9920

Figure 1 shows the front panel of the BNC-9920.

1 NI recommends using a controller and chassis combination that supports Scan Interface programming mode. For a list of

controllers and chassis that support Scan Interface programming mode, go to ni.com/info and enter the Info Code

rdsoftwareversion.

©National Instruments Corporation 3 BNC-9920 Operating Instructions and Specifications

Figure 1. BNC-9920 Front Panel

1 RES/BNC Switch (AI 3)

2 Resistor Measurement Screw

Terminals

3 Thermocouple Input Connector

4 Temperature Reference

5 BNC/Temp. Ref. Switch (AI 0)

6 BNC/Thermocouple Switch (AI 1)

7 Analog Input BNC Connectors

8 FS/GS Switches

9 Analog Output BNC Connector

10 Frequency Range Selection Switch

11 Sine/Triangle BNC Connector

12 TTL Square Wave BNC Connector

13 Sine/Triangle Waveform Switch

14 Frequency Adjust Knob

15 Amplitude Adjust Knob

16 Digital I/O Screw Terminals

(DIO 0–7)

17 Digital I/O LEDs

18 User-Defined Screw Terminals

19 User-Defined BNC Connectors

20 Digital I/O Screw Terminals

(DIO 9–20)

21 Quadrature Encoder Screw

Terminals

22 Quadrature Encoder Knob

23 Digital I/O BNC Connector (DIO 8)

24 Power Indicator LED

NOIA

Floating

Source (FS)

Ground Ref.

Source (GS)

ANALOG OUTPUTS

ANALOG INPUTS

DIGITAL I/O

FUNCTION GENERATOR

Frequency Selection

Amplitude Adjust

Sine /Triangle TTL Square Wave

Frequency Adjust

GSFS GSFS

AI 0 AI 1

USER 1

USER 2

DIO 7

DIO 6

DIO 5

DIO 4

DIO 3

DIO 2

DIO 1

DIO 0

D GND

AI 2

BNC

RES+

AI GND

AI SENSE

RES-

Tem p .

Ref.

0.1-10 kHz

LO HI LO HI

1- 10 0 k Hz 13 - 10 0 0 k Hz

Thermo

couple

BNC

RES

AI 3

BNC

AI 3

AI 4 AI 5

AI 6 AI 7

AO 0 AO 1

USER-DEFINED

SIGNALS*

*For BNC connections,

wire any Digital I/O

screw terminals here.

PWR

BNC-9920

DIGITAL I/O

DIO 8

96 Pulses/ Rev

Quadrature

Encoder

DIO 9

DIO 10

DIO 11

DIO 12

DIO 13

DIO 14

DIO 15

DIO 16

DIO 17

DIO 18

DIO 19

DIO 20

+5 V

PULSES

UP / DN

D GND

BNC-9920 Operating Instructions and Specifications 4 ni.com

To connect the BNC-9920 to the C Series I/O modules, complete the following steps. Refer to the

C Series module operating instructions for module-specific instructions and warnings.

Note If you have not already installed and configured the CompactRIO system, refer to the

CompactRIO Setup and Services page. Go to ni.com/info and enter the Info Code

rdcriostartup.

Caution Using the BNC-9920 defeats electrical isolation between C Series modules.

Caution Do not connect the 68-pin connector of the BNC-9920 to any device other than National

Instruments C Series modules. National Instruments is not liable for damage resulting from such

connections.

1. If you plan to complete the exercises in the CompactRIO Starter Kit Tutorial, make sure that the

NI 9403 is in slot 1, the NI 9205 is in slot 2, and the NI 9263 is in slot 3.

2. Place the BNC-9920 near the CompactRIO chassis or use the optional DIN Rail Mounting kit for

UMI-FLEX-6 and BNC boxes (part number 777972-01), which you can order from National

Instruments at ni.com.

Caution Refer to the C Series module specifications in the documents shipped with the modules for

information about safe voltage levels and overvoltage protection.

3. Connect the BNC-9920 to the C Series modules using the BNC-9920 cable. Connect the 68-pin

end of the cable to the BNC-9920 and the three labeled ends to the modules designated on the

labels.

4. Connect the power end of the BNC-9920 cable to the external power supply shipped with the

CompactRIO Starter Kit. The power indicator LED, shown in Figure 1, lights. If it does not light,

check the cable connections.

5. Connect signals to the BNC connectors and screw terminals as described in the following sections.

Use the pre-stripped wires in the CompactRIO Starter Kit to connect signals to the screw terminals.

If you need additional wires, use 28–16 AWG wire with the insulation stripped to 0.28 in.

When you have finished using the BNC-9920, power off any external signals connected to the

BNC-9920 before you power off the CompactRIO system.

Connecting Analog Input Signals

You can use the analog input BNC connectors on the BNC-9920 in the following ways:

• Measure differential AI signals, as described in the Connecting Differential Analog Input Signals

section

• Measure temperature, as described in the Measuring Temperature section

• Measure resistance, as described in the Measuring Resistance section

Note If you are using the NI 9205 in Scan Interface programming mode, scanned channels that are

unconnected (floating) can cause noise on subsequently scanned channels. In order to avoid noisy

measurements, connect COM to a ground reference, and ensure that any AI channel with a lower

number than the one you are measuring is connected either to a signal or to ground.

Connecting Differential Analog Input Signals

Use the BNC-9920 BNC connectors on the front panel to connect differential analog input signals to

channels AI <0..7> of the NI 9205. The BNC-9920 is intended only for differential analog input signals.

©National Instruments Corporation 5 BNC-9920 Operating Instructions and Specifications

Complete the following steps to measure a differential (DIFF) analog input signal.

1. Use a BNC cable to connect a differential analog input signal to one of the AI <0..7> BNC

connectors on the front panel of the BNC-9920.

2. If you are using AI 0, move the BNC/Temp. Ref. switch to the BNC position.

If you are using AI 1, move the BNC/Thermocouple switch to the BNC position.

If you are using AI 3, move the RES/BNC switch to the BNC position.

3. Configure your software to measure the channel differentially.

4. Move the FS/GS switch to the applicable position, depending on whether you are measuring a

floating source (FS) or ground-referenced source (GS) analog input signal. Refer to the Measuring

Floating Signals section and the Measuring Ground-Referenced Signals section for more

information about these signal sources.

Measuring Floating Signals

To measure floating signal sources, move the corresponding switch below the BNC connector to the FS

position. In the floating source switch position, the negative terminal of the NI 9205 AI channel connects

to ground through a 4.99 kΩresistor, as shown in Figure 2. Refer to the NI 9205 Operating Instructions

and Specifications for more information about measuring floating signals.

Figure 2. Measuring a Floating Signal Source

Measuring Ground-Referenced Signals

To measure ground-referenced signals, move the switch below the BNC connector for the AI channel

you are using to the GS position. Using the ground-referenced source switch position avoids ground

loops, as shown in Figure 3. Refer to the NI 9205 Operating Instructions and Specifications for more

information about measuring ground-referenced signals.

Figure 3. Measuring a Ground-Referenced Signal Source

–

Signal

Source BNC-9920

NI 9205

(Differential Input Mode)

AI GND

–

4.99 kΩ

FSMode

0.1 μF

–

Signal

Source BNC-9920

NI 9205

(Differential Input Mode)

AI GND

–

4.99 kΩ

GSMode

0.1 μF

BNC-9920 Operating Instructions and Specifications 6 ni.com

AI GND and AI SENSE signals are located at the analog input screw terminals of the BNC-9920.

Measuring Temperature

You can measure temperature on the BNC-9920 with the temperature reference and thermocouple

connector.

To use the integrated circuit (IC) temperature reference on the BNC-9920, move the BNC/Temp. Ref.

switch above the AI 0 BNC to Temp. Ref. The integrated circuit (IC) temperature reference provides

built-in cold-junction compensation (CJC) through software. The IC sensor voltage is linearly

proportional to the sensor temperature where:

°C = Volts ×100

The sensor is accurate to ±1.5 °C.

Move the BNC/Thermocouple switch above the AI 1 BNC to Thermocouple. You can connect any type

of thermocouple with a two-prong miniature or subminiature male connector to the thermocouple

connector.

Note If you are using the NI 9205 in Scan Interface programming mode, unconnected channels can

cause noise on other channels. In order to avoid noisy thermocouple measurements, move the

BNC/Temp. Ref. switch on the BNC-9920 to the Temp. Ref. position.

For more information on thermocouples and CJC, refer to the Developer Zone document, Taking

Thermocouple Temperature Measurements, by going to ni.com/info and entering the Info Code

rdtttm.

Measuring Resistance

You can measure resistance with the analog input screw terminals on the BNC-9920. Figure 4 is a

schematic representation of how the BNC-9920 measures resistance.

Figure 4. Measuring Resistance on the BNC-9920

RES+ is internally connected to AI 3 and VCC. RES– is internally connected to AI 11. There is also a

10 kΩresistor between AI 11 and AI GND.

Complete the following steps to measure resistance.

1. Move the RES/BNC switch above the AI 3 BNC to the RES position.

2. Configure your software to measure AI 3 and AI 11 in referenced single-ended (RSE) mode.

3. Connect the resistor to the RES+ and RES– screw terminals.

RES+AI 3

BNC-9920

VCC

User Resistor

Screw

Terminals

AI 11

AI GND

AI SENSE

RES–

10 kΩ

0.5%

©National Instruments Corporation 7 BNC-9920 Operating Instructions and Specifications

You can measure resistors with values ranging from 100 Ωto 1 MΩ.

4. Measure VCC on AI 3 and the voltage drop across the internal 10 kΩresistor on AI 11.

5. With these measurements, calculate the resistor value using the following formula:

Connecting Analog Output Signals

Use the AO 0 and AO 1 BNC connectors on the BNC-9920 front panel to connect analog output signals

from channels AO 0 and AO 1 of the NI 9263 to external devices. Refer to the NI 9263 Operating

Instructions and Specifications for information about using these signals.

Using the Function Generator

The BNC-9920 has a function generator that produces sine or triangle waveforms and TTL-compatible

square waveforms. Use the switch below the Sine/Triangle BNC to select a sine wave or triangle wave

output for the connector. A TTL-compatible square wave is always present at the TTL Square Wave

BNC.

To adjust the frequency of the function generator, select your frequency range using the Frequency

Selection switch. You can select 0.1–10 kHz, 1–100 kHz, or 13–1000 kHz. The Frequency Adjust knob

adjusts the frequency within the preselected range for the sine or triangle wave and the TTL square wave

outputs.

The Amplitude Adjust knob adjusts the amplitude of the sine or triangle wave output up to 4.4 Vp-p.

Connecting User-Defined Signals

The USER 1 and USER 2 BNC connectors enable you to make a BNC connection to the digital I/O

signal of your choice. The USER 1 and USER 2 BNC connectors are routed in the BNC-9920 to the

USER 1 and USER 2 screw terminals, as shown in Figure 5.

Figure 5. USER 1 and USER 2 BNC Connections

Figure 5 shows an example of how to use the USER 1 and USER 2 BNC connectors. To access the

DIO 16 signal from a BNC connector, connect the USER 1 screw terminal to the DIO 16 screw terminal

with a 28–16 AWG wire.

Resistor Value

VAI 3 VAI 11

–

VAI 11 10 kΩ()⁄

---------------------------------------=

USER 2 BNC

Internal

Connection

USER 1 BNC

D GND

USER 2

USER 1

D GND

Internal

Connection

BNC-9920 Operating Instructions and Specifications 8 ni.com

Figure 6. Connecting PFI 8 to USER 1 BNC

The designated space next to each USER <1..2> BNC is for marking or labeling signal names.

Connecting Digital I/O Signals

Use the DIO <0..20> connectors of the BNC-9920 to connect to channels DIO <0..20> of the NI 9403.

The DIO <0..7> connectors are screw terminals with indicator LEDs, DIO 8 is a BNC connector, and

DIO <9..20> are screw terminals without LED indicators. You can individually configure each signal in

LabVIEW as an input or output. Refer to the NI 9403 Operating Instructions and Specifications for

information about these lines. The BNC-9920 also has two screw terminals for the D GND and +5 V

lines.

The LEDs next to the screw terminals for DIO <0..7> indicate the state of each digital line, as shown in

Table 1.

Using the Quadrature Encoder

The BNC-9920 contains a mechanical quadrature encoder circuit that produces 96 pulses per encoder

revolution. Two outputs, PULSES and UP/DN, are at the screw terminals located below the quadrature

encoder knob. To use the quadrature encoder with the NI 9403, connect the PULSES terminal and the

UP/DN terminal to any two DIO lines of the NI 9403.

PULSES outputs a pulse train generated by rotating the encoder shaft. It provides four pulses per one

mechanical click of the encoder. UP/DN outputs a high or a low signal indicating rotation direction.

When the direction is counterclockwise, UP/DN is low. When the direction is clockwise, UP/DN is high.

Table 1. Digital I/O LEDs

Digital I/O LED Digital Port State

Lit The port is either pulled high or driven high

Not lit The port is either pulled low or driven low

BNC Cable

DIO 16

Signal

TIMING I/O

Screw Terminal Block

DIO 16

DIO 17

DIO 18

DIO 19

DIO 20

+5 V

D GND

Wire

USER 1 BNC

D GND USER 1

Internal

Connection

©National Instruments Corporation 9 BNC-9920 Operating Instructions and Specifications

You can convert the count into total degrees rotated using the following formula:

Total Degrees Rotated = PULSES ×3.75°/pulse

where 3.75°/pulse = 360°/96 pulses

Calculate the number of revolutions and remaining degrees by dividing the total degrees rotated by 360°.

The calculated quotient is equal to the number of revolutions and the remainder is equal to the remaining

degrees.

Specifications

This section lists the specifications of the BNC-9920. These specifications are typical at 25 °C unless

otherwise specified.

Caution Using the BNC-9920 defeats electrical isolation between C Series modules.

Note Refer to the documents shipped with the C Series modules for specifications about analog and

digital I/O signals.

Analog Input

Number of channels (default) ................................8 differential

Field connections (default) ....................................8 BNC connectors

Protection ...............................................................No additional protection provided.

Refer to the C Series module specifications.

Optional inputs

AI 0 ................................................................Temperature sensor

AI 1 ................................................................Thermocouple

AI 3, AI 11 .....................................................Resistor measurement (requires RSE configuration)

Optional connections

Thermocouple ................................................Uncompensated miniature connector, mates with

2-prong miniature or subminiature connector

Resistor ..........................................................2 screw terminals

Resistor measurement range ..................................100 Ωto 1 MΩ

Resistor measurement error ...................................≤5%

Screw terminals......................................................4 positions, 28–16 AWG wire

Switches

Floating source/grounded source ..................8

BNC/temperature reference IC .....................1

BNC/thermocouple connector.......................1

BNC/resistor screw terminals........................1

Analog Output

Field connection.....................................................2 BNC connectors

BNC-9920 Operating Instructions and Specifications 10 ni.com

Digital Input/Output

Screw terminals......................................................23 positions, 28–16 AWG wire

LED state indicators...............................................8, 1 each for lines DIO <0..7>

Protection (DC max V), DIO <0..7>

Powered off ....................................................±5.5 V

Powered on.....................................................+10/–5 V

Protection (DC max V), DIO <8..20>

Powered off ....................................................±1.7 V

Powered on.....................................................+6.7/–1.7 V

BNC connector ......................................................1, for DIO 8

Function Generator

Square wave ...........................................................TTL-compatible

Frequency range.............................................100 Hz to 1 MHz

Frequency adjust ............................................Through the Frequency Adjust knob

Rise time ........................................................250 ns

Fall time .........................................................50 ns

Sine/triangle wave

Frequency range.............................................100 Hz to 1 MHz

Frequency adjust ............................................Through the Frequency Adjust knob

Amplitude range ............................................60 mVp-p to 4.4 Vp-p

Amplitude adjust............................................Through the Amplitude Adjust knob

Comparison....................................................Triangle wave is approximately 2 times

the sine wave output 4.4 Vp-p maximum

Output impedance ..........................................600 Ω

Drive capability

Figure 7. Typical Maximum Voltages versus Load Impedances

Ohms

Volts

Sine/Triangle Wave (V

p-p

)

Square Wave (V

p-p

)

1 M 10 k 5 k 2 k 1 k 560

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