National Instruments NI 9476E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9476E

32-Channel, 24 V Sourcing Digital Output Module

2|ni.com |NI 9476E Operating Instructions and Specifications

This document describes how to use the National Instruments 9476E

and includes dimensions, connector assignments, and specifications for

the NI 9476E. Visit ni.com/info and enter rdsoftwareversion

to determine which software you need for the modules you are 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.

Caution National Instruments makes no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9476E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9476E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

Caution Do not operate the NI 9476E in a manner not

specified in these operating instructions. Product misuse

can result in a hazard. You can compromise the safety

protection built into the product if the product is damaged

in any way. If the product is damaged, return it to National

Instruments for repair.

NI 9476E Operating Instructions and Specifications |© National Instruments |3

NI 9476E Dimensions

The following figure shows the dimensions of the NI 9476E.

Figure 1. NI 9476E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

4|ni.com |NI 9476E Operating Instructions and Specifications

Connecting the NI 9476E

The NI 9476E has a 37-pin DSUB connector that provides

connections for 32 digital output channels.

Figure 2. NI 9476E Pin Assignments

DO16

DO17

DO18

DO19

DO20

DO21

DO22

DO23

Vsup

DO24

DO25

DO26

DO27

DO28

DO29

DO30

DO31

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

DO8

DO9

DO10

DO11

DO12

DO13

DO14

DO15

COM

NI 9476E Operating Instructions and Specifications |© National Instruments |5

Each channel has a DO pin to which you can connect a digital input

device. The 32 digital output channels are internally referenced

to COM.

You must connect an external power supply to the NI 9476. The

power supply provides the current for the output channels. Connect

the positive lead of the power supply to the supply pin, Vsup, and

the negative lead of the power supply to the common pin, COM.

Refer to the Specifications section for information about the power

supply voltage range.

Note The Vsup pins are internally connected. You can

connect only one external voltage supply to the device.

Caution Do not remove or insert modules if the external

power supply connected to the Vsup and COM pins is

powered on.

The NI 9476 has current sourcing outputs, meaning the DO pin is

driven to Vsup when the channel is turned on.

6|ni.com |NI 9476E Operating Instructions and Specifications

You can directly connect the NI 9476 to a variety of industrial

devices such as solenoids, motors, actuators, relays, and lamps.

Make sure the devices you connect to the NI 9476 are compatible

with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.

Connect the device to DO and COM, and connect the external

power supply to Vsup and COM, as shown in Figure 3.

Figure 3. Connecting a Device to the NI 9476

Caution To ensure a grounded connection, use shielded

I/O cables and tie the shield to the chassis ground.

NI 9476

COM

Vsup

Device

DO External

Power

Supply

NI 9476E Operating Instructions and Specifications |© National Instruments |7

Increasing Current Drive

Each channel has a continuous output current of 250 mA. If you

want to increase the output current to a device, you can connect

any number of channels together in parallel. For example, if you

want to drive 1 A of current, connect DO <0..3> in parallel as

shown in Figure 4. You must turn all parallel channels on and off

simultaneously so that the current on any single channel cannot

exceed the 250 mA rating.

Figure 4. Increasing the Current to a Device Connected to the NI 9476

NI 9476

250 mA

DO3

DO1

DO0

DO2

1 A

Device

COM

External

Power

Supply

sup

8|ni.com |NI 9476E Operating Instructions and Specifications

Protecting the Module from Flyback Voltages

If the module is switching an inductive or energy-storing device

such as a solenoid, motor, or relay, and the device does not have

flyback protection, install an external flyback diode as shown in

Figure 5.

Figure 5. Connecting a Flyback Diode to the NI 9476

External

Power

Supply

NI 9476

COM

Vsup

Inductive

Device

Flyback

Diode

NI 9476E Operating Instructions and Specifications |© National Instruments |9

I/O Protection

The NI 9476 is protected against overcurrent, inrush, and

short-circuit conditions in accordance with IEC 1131-2.

Understanding Protected Devices

Each channel on the NI 9476 has circuitry that protects it from

voltage and current surges resulting from short circuits.

Caution The NI 9476 can be damaged under overvoltage

and reverse bias voltage conditions. Check the voltage

specifications for all devices that you connect to the

NI 9476.

Excessive current through a DO pin causes the channel to go into

an overcurrent state. In an overcurrent state, the channel cycles off

and on until the short circuit is removed or the current returns to an

acceptably low level. Refer the Specifications section for typical

trip currents.

Each channel has a status line that indicates in software whether

the channel is in an overcurrent state. Refer to the software help for

information about reading output status.

10 |ni.com |NI 9476E Operating Instructions and Specifications

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Typically, when a system is in sleep mode, you cannot

communicate with the modules. In sleep mode, the system

consumes minimal power and may dissipate less heat than it does

in normal mode. Refer to the Specifications section for more

information about power consumption and thermal dissipation.

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