National Instruments NI 9219 Manual de usuario

OPERATING INSTRUCTIONS

NI 9219

4-Channel, 24-Bit, Universal Analog Input Module

NI 9219 Operating Instructions 2 ni.com

These operating instructions describe how to use the National

Instruments 9219. For information about installing, configuring,

and programming the system, refer to the system documentation.

Visit ni.com/info and enter the info code rdsoftwareversion

to determine which software you need for the modules you are

using.

Note The safety guidelines and specifications in this

document are specific to the NI 9219. The other

components in the system might not meet the same safety

ratings and specifications. Refer to the documentation for

each component in the system to determine the safety

ratings and specifications for the entire system.

Safety Guidelines

Operate the NI 9219 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.

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.

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 9972 connector

backshell kit to ensure that the terminals are not accessible.

NI 9219 Operating Instructions 4 ni.com

Figure 1 shows the NI 9972 connector backshell.

Figure 1. NI 9972 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9219 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4

hazardous locations; and nonhazardous locations only. Follow

these guidelines if you are installing the NI 9219 in a potentially

explosive environment. Not following these guidelines may result

in serious injury or death.

Caution Do not disconnect I/O-side wires or connectors

unless power has been switched off or the area is known

to be nonhazardous.

Caution Do not remove modules unless power has been

switched off or the area is known to be nonhazardous.

Caution Substitution of components may impair

suitability for Class I, Division 2.

Caution For Zone 2 applications, install the system

in an enclosure rated to at least IP 54 as defined by

IEC 60529 and EN 60529.

Special Conditions for Marine Applications

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

marine applications. To verify Lloyd’s Register certification, visit

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission requirements

for marine applications, use shielded cables and install

the system in a metal enclosure. Suppression ferrites

must be installed on power supply inputs near power

entries to modules and controllers. Power supply and

module cables must be separated on opposite sides of

the enclosure and must enter/exit through opposing

enclosure walls.

NI 9219 Operating Instructions 6 ni.com

Wiring the NI 9219

The NI 9219 has four 6-terminal connectors that provide

connections for four analog input channels. Connect the positive

signal of the signal source to the positive input signal terminal (HI)

and the negative signal of the signal source to the negative input

signal terminal (LO). Use the excitation terminals if your sensor

requires a separate excitation connection. Refer to Table 1 for the

signal names and Table 2 for the terminal assignments for each

mode. Refer to the NI 9219 Circuitry section for information about

connections in each mode.

Table 1. Signal Names

Module Terminal

Signal

Name Signal Description

1T+ TEDS Data

2T– TEDS COM

3EX+/HI*Positive excitation or

input signal

4HI Positive input signal

5EX–/LO*Negative excitation or

input signal

6LO Negative input signal

*Depending on the mode, terminals 3 and 5 are either the excitation signals or the

input signals.

Ch 0

Ch 1

Ch 2

Ch 3

NI 9219 Operating Instructions 8 ni.com

Table 2. Terminal Assignments

Mode

Terminal

123456

Voltage T+ T–—HI LO —

Current T+ T–HI —LO —

4-Wire Resistance T+ T–EX+ HI EX–LO

2-Wire Resistance T+ T–HI —LO —

Thermocouple T+ T–—HI LO —

4-Wire RTD T+ T–EX+ HI EX–LO

3-Wire RTD T+ T–EX+ —EX–LO

Quarter-Bridge T+ T–HI —LO —

Half-Bridge T+ T–EX+ HI EX–—

Full-Bridge T+ T–EX+ HI EX–LO

Digital In T+ T–—HI LO —

Open Contact T+ T–HI —LO —

Connecting Wires to the NI 9219 Connectors

Use a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm

(0.09 × 0.04 in.) to connect wires to the detachable spring-terminal

connectors. Insert the screwdriver into a spring clamp activation

slot and press a wire into the corresponding connector terminal,

then remove the screwdriver to clamp the wire into the terminal.

Refer to the Specifications section for more information about

spring-terminal wiring. Refer to Figure 2 for an illustration of

connecting wires to the NI 9219.

Figure 2. Connecting Wires to the NI 9219 Connectors

NI 9219 Operating Instructions 10 ni.com

Wiring TEDS Channels

The NI 9219 supports only Class II

TEDS sensors. Connect the two

TEDS lines to

TEDS Data (T+) and TEDS COM (T–) and ensure

that neither T+ nor T– is tied in common to any of the signal inputs

(terminals 3 through 6) on the NI 9219. Visit ni.com/info and

enter the info code rdteds for information about TEDS sensors.

Grounding and Shielding Considerations

You can connect ground-referenced or floating signal sources to

the NI 9219. If you make a floating connection between the signal

source and the NI 9219, make sure the voltages on the positive and

negative connections are within the channel-to-earth working

voltage range to ensure proper operation of the NI 9219. Refer to

the Specifications section for more information about operating

voltages and overvoltage protection.

Note For best signal quality, National Instruments

recommends using shielded cables and twisted pair

wiring whenever possible.

Figures 3 and 4 illustrate connecting grounded and floating signal

sources to the NI 9219 in Voltage mode.

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