National Instruments NI 9265 Manuale utente

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9265

4-Channel, 0–20 mA, 16-Bit Analog Current Output

Module

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NI 9265 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9265

and includes specifications and terminal assignments for the

NI 9265. Visit ni.com/info and enter rdsoftwareversion to

determine which software youneed for the modules youare using.

For information about installing, configuring, and programming

the system, refer to the system documentation. Visit ni.com/info

and enter cseriesdoc for information about C Series

documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9265. 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. Visit

ni.com/info and enter cseriesdoc for information

about C Series documentation.

Safety Guidelines

Operate the NI 9265 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), youmust ensure that devices

and circuits connected to the module are properly

insulated from human contact. Youmust use the NI 9932

connector backshell kit to ensure that the terminals are

not accessible.

NI 9265 Operating Instructions and Specifications 4 ni.com

Figure 1 shows the NI 9932 connector backshell.

Figure 1. NI 9932 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9265 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, and

Ex nC IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9265 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.

Caution For Zone 2 applications, connected signals must

be within the following limits:

Capacitance .......................... 80 nF max

Inductance ............................ 0.2 H max

NI 9265 Operating Instructions and Specifications 6 ni.com

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as EEx nC IIC T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations. If youare using the NI 9265 in Gas Group IIC hazardous

locations or in ambient temperatures of –40 °C ≤Ta ≤70 °C, you

must use the device in an NI chassis that has been evaluated as

EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

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 and exit through opposing

enclosure walls.

Connecting the NI 9265

The NI 9265 has a 10-terminal, detachable screw-terminal

connector that provides connections for 4 analog output channels.

Figure 2. NI 9265 Terminal Assignments

AO0

COM0

AO1

COM1

AO2

COM2

AO3

COM3

Vsup

Power Supply COM

NI 9265 Operating Instructions and Specifications 8 ni.com

The NI 9265 has four analog output channels, AO. Each channel

has a common terminal, COM, that is internally connected to the

isolated ground reference of the module. The 9265 also has a

terminal for an external power supply, Vsup, and an external power

supply common terminal, Power Supply COM.

Each AO channel has a digital-to-analog converter (DAC) that

produces a current signal. Each channel also has overvoltage and

short-circuit protection. Refer to the Specifications section for

more information about the overvoltage and short-circuit

protection. Refer to Figure 3 for an illustration of the output

circuitry for one channel of the NI 9265.

Yo ucan connect a load to each channel of the NI 9265. Connect the

positive lead of the load to the AO terminal. Connect the ground of

the load to the corresponding COM terminal. Refer to Figure 3 for

an illustration of how to connect a load to the NI 9265.

Figure 3. Connecting a Load to the NI 9265

Note Youmust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9265.

COM

NI 9265

Isolated DAC

External

Power Supply

Vsup

Power

Supply

COM

Load

Protection

DC/DC

NI 9265 Operating Instructions and Specifications 10 ni.com

Yo umust connect an external power supply to the NI 9265. This

power supply provides the current for the devices youconnect to

the module. Connect the positive lead of the power supply to the

supply terminal, Vsup, and the negative lead of the power supply to

Power Supply COM.

When the module powers on, the channels output the startup

current. Refer to the Specifications section for more information

about startup current. Refer to the software help for information

about configuring startup output states in software. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Wiring for High-Vibration Applications

If an application is subject to high vibration, National Instruments

recommends that youeither use ferrules to terminate wires to the

detachable screw-terminal connector or use the NI 9932 backshell

kit to protect the connections. Refer to Figure 4 for an illustration

of using ferrules. Refer to Figure 1 for an illustration of the

NI 9932 connector backshell.

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