National Instruments NI 9472 User manual

OPERATING INSTRUCTIONS

NI 9472/9474

8-Channel Digital Output Modules

NI 9472/9474 Operating Instructions 2 ni.com

These operating instructions describe how to use the National

Instruments NI 9472 and the NI 9474. In this document, the

NI 9472 with screw terminal and NI 9472 with DSUB are referred

to inclusively as the NI 9472. For information about installing,

configuring, and programming the system, refer to the system

documentation. To determine which software you need for the

modules you are using, go to ni.com/info and enter the info code

rdsoftwareversion.

Note The safety guidelines and specifications in this

document are specific to the NI 9472/9474. The other

components in the system may 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 9472/9474 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

You can connect hazardous voltages to the NI 9472 with screw

terminal and the NI 9474 only. Do not connect hazardous voltages

to the NI 9472 with DSUB.

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 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 shows the NI 9932 connector backshell.

NI 9472/9474 Operating Instructions 4 ni.com

Note You can use the NI 9932 connector backshell only

with the NI 9472 with screw terminal.

Figure 1. NI 9932 Connector

Safety Guidelines for Hazardous Locations

The NI 9472/9474 is suitable for use in Class I, Division 2, Groups

A, B, C, D, and 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 you are

installing the NI 9472/9474 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, install a protection

device between the input signal and the NI 9472/9474

input terminal. The device must prevent the input

Vsup-to-COM voltage from exceeding 42 V if there is a

transient overvoltage condition.

NI 9472/9474 Operating Instructions 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. 02 ATEX 0324020X. Each module

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

locations.

Special Conditions for Marine Applications

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

marine applications. To verify Lloyd’s Register certification, go to

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.

Wiring the NI 9472/9474

The NI 9472/9474 provides connections for eight digital output

channels. The NI 9472/9474 has a 10-terminal, detachable screw

terminal connector. The NI 9472 with DSUB has a 25-pin DSUB

connector.

Each channel of the NI 9472/9474 has a terminal or pin, DO, to

which you can connect the device. Each channel has an LED that

indicates the state of the channel.

You must connect an external power supply to the NI 9472/9474.

This power supply provides the current for the devices you connect

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

supply terminal or pin, Vsup, and the negative lead of the power

supply to the common terminal or pin, COM. The eight digital

output channels are internally referenced to COM. Refer to Table 1

for the terminal assignments of the NI 9472 with screw terminal

and NI 9474. Refer to Figure 2 for the pin assignments of the

NI 9472 with DSUB.

NI 9472/9474 Operating Instructions 8 ni.com

Table 1. Terminal Assignments

Module Terminal Signal

0DO0

1DO1

2DO2

3DO3

4DO4

5DO5

6DO6

7DO7

8Supply (Vsup)

9Common (COM)

Figure 2. Pin Assignments

COM

Vsup

COM

Vsup

COM

Vsup

COM

Vsup

COM

DO0

Vsup

DO1

DO2

Vsup

DO3

DO4

Vsup

DO5

DO6

Vsup

DO7

NI 9472/9474 Operating Instructions 10 ni.com

Wiring for High Vibration Applications

National Instruments recommends using ferrules for terminating

wires to the detachable screw terminal connector or using the

NI 9932 backshell kit to protect the connections when you use the

NI 9472 with screw terminal or the NI 9474 in high-vibration

applications. Refer to Figure 3 for an illustration.

Figure 3. 10-pin Detachable Screw Terminal Connector with a Ferrule

Ferrule

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