National Instruments NI 9477 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

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NI 9477

32-Channel, 0–60 V, Sinking Digital Output Module

This document describes how to use the National Instruments 9477
and includes specifications and pin assignments for the NI 9477.
Vis it 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
and enter

cseriesdoc for information about C Series

ni.com/info

documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9477. 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.

NI 9477 Operating Instructions and Specifications 2 ni.com

Safety Guidelines

Operate the NI 9477 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 Locations

The NI 9477 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T 4 ha zar dous 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 9477 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.

© National Instruments Corp. 3 NI 9477 Operating Instructions and Specifications

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 across the external power supply and the COM
pin. The device must prevent the external power supply
voltage from exceeding 80 V if there is a transient
overvoltage condition.

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex 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, in ambient temperatures of – 40 °C ≤Ta ≤70 °C. If you
are using the NI 9477 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as
Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4
equipment.

NI 9477 Operating Instructions and Specifications 4 ni.com

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.

© National Instruments Corp. 5 NI 9477 Operating Instructions and Specifications

Connecting the NI 9477

DO16
DO17
DO18
DO19
DO20
DO21
DO22
DO23
COM
COM
DO24
DO25
DO26
DO27
DO28
DO29
DO30
DO31

DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
COM
COM
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
NC

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

The NI 9477 has a 37-pin DSUB connector that provides
connections for 32 digital output channels.

NI 9477 Operating Instructions and Specifications 6 ni.com

Figure 1. NI 9477 Pin Assignments

Each channel of the NI 9477 has a DO pin to which you can
connect a digital input device, and the module also has four COM
pins. The NI 9477 has current sinking outputs, meaning the DO pin
is driven to COM when the channel is turned on.

Yo u can directly connect the NI 9477 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9477 are compatible
with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.

Note National Instruments recommends you use cables

and connectors that are suitably rated for the 20 A module
output current limit. Refer to the Specifications section
for information about output current limits.

Connect the device to DO and the positive lead of the external
power supply, and connect the negative lead of the power supply to
the four COM pins, as shown in Figure 2.

© National Instruments Corp. 7 NI 9477 Operating Instructions and Specifications

Figure 2. Connecting a Device to the NI 9477

Device

+

–

NI 9477

COM

DO

External
Power
Supply

Increasing Current Drive

Each channel has a continuous output current of 1 A. 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 4 A of current, connect DO<0..3> in parallel as shown
in Figure 3. You must turn all parallel channels on and off
simultaneously so that the current on any single channel cannot
exceed the 1 A rating.

NI 9477 Operating Instructions and Specifications 8 ni.com

Note Yo u must keep the module within the 20 A module

output current limit. Driving 1 A on more than 20 channels
would overload the module. Refer to the Specifications
section for information about output current limits.

NI 9477

DO0

DO1

DO2

DO3

COM

1 A

1 A

1 A

1 A

4 A

Device

+
_

External
Power
Supply

Figure 3. Increasing the Current to a Device Connected to the NI 9477

© National Instruments Corp. 9 NI 9477 Operating Instructions and Specifications

Protecting the Module from Flyback Voltages

Inductive

Device

+

–

NI 9477

COM

DO

External
Power
Supply

Flyback

Diode

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 4.

Figure 4. Connecting a Flyback Diode to the NI 9477

NI 9477 Operating Instructions and Specifications 10 ni.com

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.

© National Instruments Corp. 11 NI 9477 Operating Instructions and Specifications

Specifications

The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.

Output Characteristics

Number of channels.......................... 32 digital output channels

Output type ....................................... Sinking

Power-on output state ....................... Channels off

Output voltage (V

) ........................... I0 ·

0

External power supply

voltage range..................................... 0–60 VDC

Continuous output current (I0)

Per channel ...................................1 A max, on up to 20 channels

Module

(sum of all channels) .................. 20 A max

Output impedance (R0) .....................0.065 Ω max

Reversed-voltage protection ............. None

Short-circuit protection..................... None

NI 9477 Operating Instructions and Specifications 12 ni.com

R

0

Maximum update rate ....................... 8 μs max

Propagation delay ............................. 1 μs max

MTBF ............................................... 717,920 hours at 25 °C;

Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method

Note Contact NI for Bellcore MTBF specifications

at other temperatures or for MIL-HDBK-217F
specifications.

Power Requirements

Power consumption from chassis

Active mode ...............................650 mW max

Sleep mode ................................. 25 μW max

Thermal dissipation at 70 °C

Active mode ............................... 1.5 W max

Sleep mode ................................. 25 μW max

© National Instruments Corp. 13 NI 9477 Operating Instructions and Specifications

Physical Characteristics

If you need to clean the module, wipe it with a dry towel.

Note For two-dimensional drawings and

three-dimensional models of the C Series module and
connectors, visit ni.com/dimensions and search by
module number.

Weight............................................... 145 g (5.1 oz)

Safety

Maximum Voltage

Connect only voltages that are within the following limits:

Channel-to-COM .............................. 60 VDC, Measurement

Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for

1

The maximum voltage that can be applied or output between a channel and COM
without creating a safety hazard.

NI 9477 Operating Instructions and Specifications 14 ni.com

1

Category I

measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.

Caution Do not connect the NI 9477 to signals or use

for measurements within Measurement Categories II,
III, or IV.

Isolation Voltages

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

Channel-to-earth ground

Continuous ................................. 60 VDC, Measurement

Withstand....................................1,000 V

© National Instruments Corp. 15 NI 9477 Operating Instructions and Specifications

Category I

, verified by a 5 s

rms

dielectric withstand test

Hazardous Locations

U.S. (UL) .......................................... Class I, Division 2,

Canada (C-UL) ................................. Class I, Division 2,

Europe (DEMKO)............................. Ex nC IIC T4

Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4

Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4

Safety Standards

This product meets the requirements of the following standards of
safety for electrical equipment for measurement, control, and
laboratory use:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Note For UL and other safety certifications, refer to the

product label or the Online Product Certification section.

NI 9477 Operating Instructions and Specifications 16 ni.com

Electromagnetic Compatibility

This product meets the requirements of the following EMC
standards for electrical equipment for measurement, control, and
laboratory use:

• EN 61326 (IEC 61326): Class A emissions; Industrial
immunity

• EN 55011 (CISPR 11): Group 1, Class A emissions

• AS/NZS CISPR 11: Group 1, Class A emissions

• FCC 47 CFR Part 15B: Class A emissions

• ICES-001: Class A emissions

Note For the standards applied to assess the EMC of this

product, refer to the Online Product Certification section.

Note For EMC compliance, operate this device with

shielded cables.

© National Instruments Corp. 17 NI 9477 Operating Instructions and Specifications

CE Compliance

This product meets the essential requirements of applicable
European Directives as follows:

• 2006/95/EC; Low-Voltage Directive (safety)

• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)

Online Product Certification

Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain product
certifications and the DoC for this product, visit

certification

, search by module number or product line, and

ni.com/

click the appropriate link in the Certification column.

Shock and Vibration

To meet these specifications, you must panel mount the system.
Operating vibration

Random (IEC 60068-2-64)......... 5 g

Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz

Operating shock

(IEC 60068-2-27).............................. 30 g, 11 ms half sine,

NI 9477 Operating Instructions and Specifications 18 ni.com

, 10 to 500 Hz

rms

50 g, 3 ms half sine,
18 shocks at 6 orientations

Environmental

National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.

Operating temperature

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

Storage temperature

(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C

Ingress protection.............................. IP 40

Operating humidity

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

noncondensing

Storage humidity

(IEC 60068-2-56).............................. 5 to 95% RH,

noncondensing

Maximum altitude............................. 2,000 m

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

© National Instruments Corp. 19 NI 9477 Operating Instructions and Specifications

Environmental Management

National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.

For additional environmental information, refer to the NI and the
Environment Web page at
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers At the end of the life cycle, all products

must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit

environment/weee

NI 9477 Operating Instructions and Specifications 20 ni.com

ni.com/environment. This page

ni.com/

.

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about China RoHS compliance, go to

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environment/rohs_china

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The National Instruments Web site is your complete resource for
technical support. At

ni.com/support you have access to

everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.

National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at
and follow the calling instructions or dial 512 795 8248. For

© National Instruments Corp. 21 NI 9477 Operating Instructions and Specifications

ni.com/support

telephone support outside the United States, contact your local
branch office:

Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 328 90 10,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545

NI 9477 Operating Instructions and Specifications 22 ni.com

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