National Instruments BNC-2115 Manuel utilisateur

INSTALLATION GUIDE

BNC-2115

Desktop and DIN Rail-Mountable BNC Adapter for E Series Devices

This installation guide describes how to install and configure your

BNC-2115 accessory. If you have not already installed your DAQ device,

refer to the DAQ Quick Start Guide for instructions.

The BNC-2115 is a desktop and DIN rail-mountable BNC adapter you

can connect to data acquisition (DAQ) devices. The BNC-2115 includes

24 BNC connectors and a two-position screw terminal.

The BNC-2115 has one 68-pin connector on the rear panel to connect to

your DAQ device.The 68-pin I/O connector connects to the extended

analog input of 64-channel Multifunction DAQ devices and the extended

digital I/O (DIO) of Multifunction DAQ devices. The BNC-2115 is ideal

for simplifying connections between your measurement apparatus and your

DAQ device in laboratory, test, and production environments.

What You Need to Get Started

To set up and use your BNC-2115 accessory, you need the following:

❑BNC-2115 BNC adapter

❑BNC-2115 Installation Guide

❑SH1006868 cable

❑One of the following Multifunction DAQ devices:

– NI PCI-6033E

– NI PCI/PXI-6025E

– NI PCI/PXI-6031E

– NI PCI/PXI-6071E

– NI AT-MIO-64E-3

– NI AT-MIO-16DE-10

BNC-2115 Installation Guide 2 ni.com

For detailed specifications for the BNC-2115, refer to the Specifications

section.

Caution Do not connect the BNC-2115 to any device other than the National Instruments

devices listed previously. Doing so can damage the BNC-2115, the DAQ device, or the host

computer. National Instruments is not liable for damage resulting from these connections.

Installing the BNC-2115

To connect the BNC-2115 to your DAQ device, refer to Figure 1 as you

complete the following steps. Consult your computer user manual or

technical reference manual for specific instructions and warnings.

Note If you have not already installed your DAQ device, refer to the DAQ Quick Start

Guide for instructions.

Figure 1. Connecting the BNC-2115 to Your DAQ Device

1 BNC-2115

2 SH1006868 Cable

3DAQDevice

4 Personal Computer

FLOA

TING

SOURCE(FS)

GROUNDREF

SOURCE(GS)

ANALOG INPUT DIGITALI /O

AISENSE PB3

AIGND DGND

©National Instruments Corporation 3 BNC-2115 Installation Guide

1. Place the BNC-2110 near the host computer or use the optional DIN

rail-mounting kit, which you can order from National Instruments.

For more information about the DIN rail-mounting kit, refer to the

National Instruments Web site at ni.com or call the office nearest you.

2. With your DAQ device powered off, connect the BNC-2115 to your

DAQ device with the extended I/O end of the SH1006868 cable.

3. Make sure the floating source (FS)/ground-referenced source (GS)

switches under BNC connectors AI <16..55> are set correctly for your

application. National Instruments recommends that you set the

switches to GS for analog output and digital signals.

4. Connect the field signals to the BNC connectors and/or digital screw

terminal plugs. Refer to the Connecting Signals to the BNC-2115

section for more information.

5. Refer to the DAQ Quick Start Guide to launch Measurement &

Automation Explorer (MAX), confirm that your device is recognized,

and configure your device settings. National Instruments recommends

that you use your DAQ device in differential mode when using the

BNC-2115.

6. Test specific device functionality, such as the ability to send and

receive data. Refer to the DAQ Quick Start Guide for more detailed

information on running test panels in MAX.

When you have finished using the BNC-2115, power off any external

signals connected to the BNC-2115 before you power off the computer.

Caution The BNC-2115 is not designed for input voltages greater than 42 V, even if a

user-installed voltage divider reduces the voltage to within the input range of the DAQ

device. Input voltages greater than 42 V can damage the BNC-2115, any device connected

to it, and the host computer. Overvoltage also can cause an electric shock hazard for the

operator. National Instruments is not liable for damage or injury resulting from misuse.

Connecting Signals to the BNC-2115

This section describes how to configure the BNC-2115. Figure 2 shows the

front panel of the BNC-2115

Note With NI-DAQmx, National Instruments has revised its terminal names so they are

easier to understand and more consistent among NI hardware and software products.

The revised terminal names used in this document are usually similar to the names they

replace. For a complete list of traditional NI-DAQ terminal names and their NI-DAQmx

equivalents, refer to the Terminal Name Equivalences table in the E Series Help at

ni.com/manuals.

BNC-2115 Installation Guide 4 ni.com

Figure 2. BNC-2115 Front Panel

1 Screw Terminals

2 BNC Connectors

3 Floating Source (FS)/

Ground-Reference Source (GS) Switch

4 BNC Center Pin

5 BNC Shield

Floating

Source (FS)

Ground Ref.

Source (GS)

AI GND D GND

AI SENSE P1.3

AI16

AO8

AI22

AO14

AI36

AO16

P2.7 P2.1 P1.2 P0.4

P2.6 P2.0 P1.1 P0.3

P2.5 P1.7 P1.0 P0.2

P2.4 P1.6 P0.7 P0.1

P2.3 P1.5 P0.6 P0.0

P2.2 P1.4 P0.5 +5V

AI17

AO9

AI23

AO15

AI37

AO21

AI18

AO10

AI32

AO16

AI38

AO22

AI52

AI19

AO11

AI33

AO17

AI39

AO23

AI20

AO12

AI34

AO18

AI48

AO24

AI20

AO12

AI35

AO19

AI49

AO25

AI55

AO31

ANALOG IN · ANALOG OUT

DIGITAL I/O

BNC-2115

AI54

AO30

AI53

AO29

AI55

AO31

AI51

AO27

AI50

AO26

©National Instruments Corporation 5 BNC-2115 Installation Guide

To connect AI signals to the NI PCI/PXI-60XXE and AT-MIO-64E-3

devices using the AI <16..55> BNC-2115 connectors, refer to the

Connecting Analog Input Signalssection.

To connect DIO signals to the NI PCI/PXI-6025E and AT-MIO-16DE-10

devices using the P0.<0..7>, P1.<0..7>, and P2.<0..7> BNC-2115

connectors, refer to the Connecting Digital I/O Signals section.

Connecting Analog Input Signals

National Instruments recommends that you use the BNC-2115 in

differential mode. If you need more analog inputs in your application than

are available using differential mode, you can configure your DAQ device

in single-ended mode and double the number of analog input channels.

Refer to the Operating the BNC-2115 in Single-Ended Mode section

for details. You can use the BNC-2115 to measure floating and

ground-referenced analog input signals in differential mode.

Measuring Floating Signal Sources

To measure floating signal sources, move the switch located below the

applicable analog input BNC to the floating source switch position labeled

FS. In the floating source switch position, the amplifier negative terminal

is connected to ground using a 5 kΩ resistor in parallel with a 0.1 µF

capacitor. Table 1 shows the BNC-2115 switch configuration options.

Note Measuring floating signal sources, such as isolated battery-powered equipment,

with the GS setting results in incorrect measurements.

BNC-2115 Installation Guide 6 ni.com

Measuring Ground-Referenced Signals

To measure ground-referenced signals, move the switches to either

the floating or ground-referenced source position. However, for best

performance, use the ground-referenced source position labeled GS to

avoid ground loops. Refer to your DAQ device documentation for more

information on measuring floating and ground-referenced signals.

The BNC-2115 connectors AI <16..55> correspond to the device

differential analog channels 16 to 55.

Table 1. Configuration Summary

BNC-2115 Switch

Configuration

Signal Source Types

Floating Source Ground-Referenced Source

Floating Source

(FS)

Ground-

Referenced Source

(GS)

–

Signal

Source BNC-2115

DAQ Device

(Differential Input

Mode)

AI GND

–

Recommended

–

Signal

Source BNC-2115

DAQ Device

(Differential Input

Mode)

AI GND

–

Not Recommended

–

Signal

Source BNC-2115

Improper Configuration

DAQ Device

(Differential Input

Mode)

–

AI GND

–

Signal

Source BNC-2115

DAQ Device

(Differential Input

Mode)

AI GND

–

Recommended

©National Instruments Corporation 7 BNC-2115 Installation Guide

Table 2 describes the two-position terminal block signals on the front panel

of the BNC-2115.

Connecting Analog Output Signals

National Instruments recommends that you set the switches to the

ground-referenced (GS) position when measuring analog output signals.

The AO <8..31> channels correspond with the AI <16..33>, AI <32..39>,

and AI <48..55> connectors. For details on how each AO signal

corresponds to each AI signal, refer to Figure 2.

Connecting Digital I/O Signals

Use the BNC connectors and the two-position screw terminal to connect

your digital signals to your DAQ device. The DIO signal can be accessed

on the center pin of the applicable BNC connector, while digital ground can

be accessed on the outer shield of the BNC connector. Tables 3 and 4

describe the connectors for digital signals on the front panel of the

BNC-2115.

Table 2. BNC-2115 Two-Position Terminal Block Signal Descriptions

Two-Position

Terminal Block

Connector Signal Description

AI GND Analog Input Ground—The analog input

voltages are referenced to this node.

AI SENSE Analog Input Sense—This pin serves as the

reference node for channels AI <16..63> in

NRSE configurations.

Table 3. BNC-2115 BNC Connections for Extended DIO Accessory

Front Panel BNC

Connectors Signal Description

P2.<0..7> Bidirectional DIO Port 2, channels

0 through 7

P1.<0..7> Bidirectional DIO Port 1, channels

0 through 71

P0.<0..7> Bidirectional DIO Port 0, channels

0 through 7

1You also can connect to P1.3 through a terminal block screw connector. Refer to Table 4.

BNC-2115 Installation Guide 8 ni.com

To connect DIO signals to the NI PCI-60XXE and NI AT-MIO-64E-3

devices, use the AI <16..55> BNC-2115 connectors. To connect DIO

signals to the NI PCI-6025E and NI AT-MIO-16DE-10 devices, use the

P0.<0..7>, P1.<0..7>, and P2.<0..7> BNC-2115 connectors.

For more detailed information about how the accessory terminals

correspond one-to-one to the Multifunction DAQ device, refer to the I/O

Connector Pinouts Table in the E Series Help at ni.com/manuals.

Operating the BNC-2115 in Single-Ended Mode

You can increase the number of analog input channels by configuring

the DAQ device analog input to operate in either referenced single-ended

(RSE) mode, or nonreferenced single-ended (NRSE) mode. In either of

these modes, each BNC coaxial cable carries two single-ended channels,

instead of one differential channel.

To configure the analog input using Traditional NI-DAQ, open

Measurement & Automation Explorer (MAX), open Devices and

Interfaces»Traditional NI-DAQ Devices, then right-click the icon for

your device. Select Properties from the menu, then click the AI tab and

change the analog input (AI) mode to RSE or NRSE.

To configure input terminals using NI-DAQmx, use the DAQ Assistant or

the NI-DAQmx API. For more information, refer to the DAQ Assistant Help

and the Measurement and Automation Explorer Help for NI-DAQmx.

Table 4. BNC-2115 Two-Position Terminal Block Connections for

Extended DIO Accessory

Two-Position

Terminal Block

Connector Signal Description

D GND Digital Ground—This pin supplies the

reference for the digital signals at the I/O

connector as well as the +5 VDC supply.

P1.3 Port 1 line 3—This is the bidirectional

DIO line for Port 1.

©National Instruments Corporation 9 BNC-2115 Installation Guide

Table 5 shows the connections that you need to make.

Table 5. Analog BNC Pairs

BNC Center

BNC Outer

Shield

Signal

Reference

Ground

Reference

AI 16 AI 24 AI SENSE AI GND

AI 17 AI 25 AI SENSE AI GND

AI 18 AI 26 AI SENSE AI GND

AI 19 AI 27 AI SENSE AI GND

AI 20 AI 28 AI SENSE AI GND

AI 21 AI 29 AI SENSE AI GND

AI 22 AI 30 AI SENSE AI GND

AI 23 AI 31 AI SENSE AI GND

AI 32 AI 40 AI SENSE AI GND

AI 33 AI 41 AI SENSE AI GND

AI 34 AI 42 AI SENSE AI GND

AI 35 AI 43 AI SENSE AI GND

AI 36 AI 44 AI SENSE AI GND

AI 37 AI 45 AI SENSE AI GND

AI 38 AI 46 AI SENSE AI GND

AI 39 AI 47 AI SENSE AI GND

AI 48 AI 56 AI SENSE AI GND

AI 49 AI 57 AI SENSE AI GND

AI 50 AI 58 AI SENSE AI GND

AI 51 AI 59 AI SENSE AI GND

AI 52 AI 60 AI SENSE AI GND

AI 53 AI 61 AI SENSE AI GND

AI 54 AI 62 AI SENSE AI GND

AI 55 AI 63 AI SENSE AI GND

BNC-2115 Installation Guide 10 ni.com

Specifications

This section lists the specifications of the BNC-2115. These specifications

are typical at 25 °C unless otherwise specified.

Field connection .....................................24 BNC connectors

Screw terminal........................................2-pin

Physical

Dimensions .............................................19.05 by 10.48 by 3.51 cm

(7.5 by 4.125 by 1.38 in.)

I/O connector ..........................................68-pin male connector

BNC connectors......................................24

Screw terminal plugs ..............................2

Environment

Operating temperature ............................0 to 70 °C

Storage temperature ................................–55 to 125 °C

Relative humidity ...................................5 to 90% noncondensing

Safety

The BNC-2110 meets the requirements of the following standards for

safety and electrical equipment for measurement, control, and

laboratory use:

• IEC 61010-1, EN 61010-1

• UL 3111-1, UL 61010B-1

• CAN/CSA C22.2 No. 1010.1

Note For UL and other safety certifications, refer to the product label or to ni.com.

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