National Instruments NI 9437 Manual de usuario

GETTING STARTED GUIDE

NI 9437

8-Channel, 250 V Sinking Digital Input Module

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2|ni.com |NI 9437 Getting Started Guide

This document explains how to connect the National

Instruments 9437.

Before You Begin Complete the hardware and software

installation procedures in your chassis documentation.

Note The guidelines in this document are specific to the

NI 9437. The other components in the system might not

meet the same safety ratings. Refer to the documentation

for each component in the system to determine the safety

and EMC ratings for the entire system.

Safety Guidelines

Operate the NI 9437 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may

be hot. Touching this component may result in bodily

injury.

Caution Do not operate the NI 9437 in a manner not

specified in this manual. Product misuse can result in a

hazard. You can compromise the safety protection built

NI 9437 Getting Started Guide |© National Instruments |3

into the product if the product is damaged in any way. If

the product is damaged, return it to National Instruments

for repair.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the

following precautions. A hazardous voltage is a voltage greater

than 42.4 Vpk or 60 VDC to earth ground.

Caution Ensure that hazardous voltage wiring is

performed only by qualified personnel adhering to local

electrical standards.

Caution Do not mix hazardous voltage circuits and

human-accessible circuits on the same module.

Caution Make sure that devices and circuits connected

to the module are properly insulated from human contact.

4|ni.com |NI 9437 Getting Started Guide

Caution When module terminals are hazardous voltage

LIVE (>42.4 Vpk/60 VDC), you must ensure that devices

and circuits connected to the module are properly

insulated from human contact. You must use the NI 9932

connector backshell kit to ensure that the terminals are

not accessible.

Figure 1. NI 9932 Connector Backshell

NI 9437 Getting Started Guide |© National Instruments |5

Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM, VSUP-to-COM ..... 300 VDC max

Isolation

Channel-to-channel .................... None

Channel-to-VSUP......................... None

Channel-to-earth ground, VSUP-to-earth ground,

COM-to-earth ground

Continuous ........................... 300 Vrms, Measurement

Category II

Withstand ............................. 3,000 V, verified by a 5 s

dielectric withstand test

Measurement Category II is for measurements performed on

circuits directly connected to the electrical distribution system.

This category refers to local-level electrical distribution, such as

that provided by a standard wall outlet, for example, 115 V for U.S.

or 230 V for Europe.

Caution Do not connect the NI 9437 to signals or use for

measurements within Measurement Categories III or IV.

6|ni.com |NI 9437 Getting Started Guide

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 industrial locations. There is no

guarantee that harmful interference will not occur in a particular

installation, when the product is connected to a test object, or if the

product is used in residential areas. To minimize the potential for

the product to cause interference to radio and television reception

or to experience 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.

Caution To ensure the specified EMC performance,

operate this product only with shielded cables and

accessories. Do not use unshielded cables or accessories

unless they are installed in a shielded enclosure with

NI 9437 Getting Started Guide |© National Instruments |7

properly designed and shielded input/output ports and

connected to the product using a shielded cable. If

unshielded cables or accessories are not properly installed

and shielded, the EMC specifications for the product are

no longer guaranteed.

Caution To ensure the specified EMC performance,

cable shields must be connected to the ground lug of the

carrier using a wire of minimum practical length.

Special Guidelines for Marine Applications

Some products are Lloyd’s Register (LR) Type Approved for

marine (shipboard) applications. To verify Lloyd’s Register

certification for a product, visit ni.com/certification and

search for the LR certificate, or look for the Lloyd’s Register mark

on the product label.

Caution In order to meet the EMC requirements for

marine applications, install the product in a shielded

enclosure with shielded and/or filtered power and

input/output ports. In addition, take precautions when

designing, selecting, and installing measurement probes

and cables to ensure that the desired EMC performance is

attained.

8|ni.com |NI 9437 Getting Started Guide

Preparing the Environment

Ensure that you are using the NI 9437 in an environment that meets

the following specifications:

Operating temperature

(IEC 60068-2-1, IEC 60068-2-2) ..... -40 °C to 70 °C

Operating humidity

(IEC 60068-2-56).............................. 10% to 90% RH,

noncondensing

Pollution Degree ............................... 2

Maximum altitude............................. 5,000 m

Indoor use only.

Note Refer to the NI 9437 Datasheet on ni.com/

manualsfor complete specifications.

NI 9437 Getting Started Guide |© National Instruments |9

Connecting the NI 9437

The NI 9437 provides connections for 8 digital input channels.

Figure 2. NI 9437 Pinout

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

VSUP

COM

10 |ni.com |NI 9437 Getting Started Guide

Connecting Sourcing-Output Devices

You can connect sourcing-output devices to the NI 9437. You must

connect a supply voltage to the VSUP pin on the NI 9437. Input

channels on the NI 9437 read ON or OFF depending on the

threshold set by the VSUP pin. The VSUP threshold is approximately

2/3 of the supply voltage on the VSUP pin.

Figure 3. Connecting a Sourcing-Output Device

NI 9437

2/3

≥

–

External

Power

Supply

COM

VSUP

Sourcing-Output

Device

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