National Instruments NI 9474 User manual

GETTING STARTED GUIDE
NI 9474
8 DO, 5 V to 30 V, Sourcing, 1 μs

This document explains how to connect to the NI 9474. In this
document, the NI 9474 with screw terminal and the NI 9474 with
spring terminal are referred to inclusively as the NI 9474.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9474. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
Safety Guidelines
Operate the NI 9474 only as described in this document.
Caution Do not operate the NI 9474 in a manner not
specified in this document. Product misuse can result in
a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
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way. If the product is damaged, return it to NI for
repair.
Hazardous Voltage This icon denotes a warning
advising you to take precautions to avoid electrical
shock with the NI 9474 with screw terminal and the
NI 9474 with spring terminal.
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM 30 VDC maximum
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 250 Vrms, Measurement
Category II
Withstand 2,300 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
NI 9474 Getting Started Guide | © National Instruments | 3

This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for
U.S. or 230 V for Europe.
Caution Do not connect the NI 9474 to signals or use
for measurements within Measurement Categories III
or IV.
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the device, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk voltage 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 Ensure that devices and circuits connected to
the module are properly insulated from human contact.
Note When module terminals are hazardous voltage
LIVE (>42.4 Vpk/60 VDC), you must ensure that
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devices and circuits connected to the module are
properly insulated from human contact. You must use
the NI 9927 connector backshell kit with the NI 9474
with screw terminal and the NI 9981 connector
backshell kit with the NI 9474 with spring terminal to
ensure that the terminals are not accessible.
Safety Guidelines for Hazardous Locations
The NI 9474 is suitable for use in Class I, Division 2, Groups A,
B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4
and Ex nA IIC T4 hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 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.
NI 9474 Getting Started Guide | © National Instruments | 5

Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
Caution For Division 2 and Zone 2 applications,
install a protection device between the Vsup and COM
terminals on the NI 9474. The device must prevent the
input Vsup-to-COM voltage from exceeding 42 V if
there is a transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9474 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 03 ATEX 0324020X and is
IECEx UL 14.0089X certified. Each NI 9474 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 9474
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
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Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
stated in the product specifications. These requirements and
limits provide reasonable protection against harmful interference
when the product is operated in the intended operational
electromagnetic environment.
This product is intended for use in industrial locations. However,
harmful interference may occur in some installations, when the
NI 9474 Getting Started Guide | © National Instruments | 7

product is connected to a peripheral device or test object, or if the
product is used in residential or commercial areas. To minimize
interference with radio and television reception and prevent
unacceptable performance degradation, install and use this
product in strict accordance with the instructions in the product
documentation.
Furthermore, any changes or modifications to the product not
expressly approved by National Instruments could void your
authority to operate it under your local regulatory rules.
Special Conditions for Marine Applications
Some products are Lloyd’s Register (LR) Type Approved for
marine (shipboard) applications. To verify Lloyd’s Register
certification for a product, visit ni.com/certification and search
for the LR certificate, or look for the Lloyd’s Register mark on
the product.
Caution In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
8| ni.com | NI 9474 Getting Started Guide

and cables to ensure that the desired EMC performance
is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI 9474
meets the following specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Operating humidity
(IEC 60068-2-78)
10% RH to 90% RH,
noncondensing
Pollution Degree 2
Maximum altitude 2,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
NI 9474 Getting Started Guide | © National Instruments | 9

NI 9474 Pinout
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
COM
0
1
2
3
4
5
6
7
8
9
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
COM
0
1
2
3
4
5
6
7
8
9
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Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9474 with screw terminal or
NI 9474 with spring terminal.
Table 1. NI 9474 Signal Descriptions
Signal Description
COM Common reference connection to isolated ground
DO Digital output signal connection
Vsup Voltage supply connection
Table 2. LED Indicators
LED Pattern Indication
Solid The channel has been programmed to be in the ON state.
Off The channel has been programmed to be in the OFF
state.
NI 9474 Getting Started Guide | © National Instruments | 11

Connecting Digital Devices
You can connect a variety of industrial devices, such as solenoids,
motors, actuators, relays, and lamps to the NI 9474. You must
connect an external power supply to the NI 9474. The power
supply provides the current for the output channels.
Figure 1. Connecting an Industrial Device to the NI 9474
External
Power
Supply
NI 9474
+
_
COM
Vsup
Device
DO
Caution Do not install or remove C Series modules
from your system if the external power supply
connected to the Vsup and COM pins is powered on.
12 | ni.com | NI 9474 Getting Started Guide

Ensure that the devices you connect to the NI 9474 are
compatible with the output specifications of the NI 9474. Refer to
the device datasheet at ni.com/manuals for output specifications.
Note When the industrial device is off, DO is not
connected to COM. For large source impedances, you
must use a pull-down resistor between DO and COM.
Visit ni.com/info and enter the Info Code
CSeriesDOPulseGen for more information.
Increasing Current Drive
Each channel of the NI 9474 has a continuous output current of
1.0 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 DO0
through DO3 in parallel, as shown in the following figure. You
must turn all parallel channels on and off simultaneously so that
the current on any single channel cannot exceed the 1.0 A rating.
NI 9474 Getting Started Guide | © National Instruments | 13

Figure 2. Increasing the Current to a Device Connected to the NI 9474
NI 9474
DO3
DO1
DO0
DO2
4 A
+
_
COM
1 A
1 A
1 A
1 A
External
Power
Supply
Device
Vsup
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends
that you follow these guidelines to protect connections to the
NI 9474:
• Use ferrules to terminate wires to the detachable connector.
• Use the NI 9927 backshell kit with the NI 9474 with screw
terminal or the NI 9981 backshell kit with the NI 9474 with
spring terminal.
14 | ni.com | NI 9474 Getting Started Guide

I/O Protection
The NI 9474 provides short-circuit protection.
Each channel has circuitry that protects it from current surges
resulting from short circuits over 14 A.
Note Refer to the device datasheet at ni.com/manuals
for maximum continous output current, short-circuit
behavior, and short-circuit trip time specifications and
information about conditions that may damage the
module.
Note Refer to the IEC 61131-2 standard for more
information about short-circuit-proof devices.
Note Because the NI 9474 includes internal flyback
diodes, you do not need to add external diodes when
connecting to switching devices that store energy.
NI 9474 Getting Started Guide | © National Instruments | 15

Power Supplies and Overcurrent Conditions
If a short circuit occurs, the current through DO can exceed the
current rating for the power supply and the maximum continuous
output current for the NI 9474.
If the power supply you are using with the NI 9474 cannot supply
more than 14 A, the module may be damaged if a short circuit
condition occurs.
Detecting an Overcurrent Condition
If a device connected to the module is not working while the
channel is on, the module channel may be in an overcurrent state.
Neither the software nor the module LEDs indicate if an
overcurrent condition occurs. A channel LED may be on even if
the channel is off because of an overcurrent condition.
To determine if the channel is in an overcurrent state, measure the
voltage between DO and Vsup. If the voltage is equal to the
voltage of the external power supply connected to the module,
the channel is in an overcurrent state.
16 | ni.com | NI 9474 Getting Started Guide

Resetting Channels after an Overcurrent
Condition
After you have determined and fixed the cause of an overcurrent
condition, reset the channel by turning it off.
Alternatively, you can disconnect the external power supply from
the chassis. However, doing so disconnects power from all the
module channels.
Normal operation can resume after you correct the overcurrent
condition and reset the channel.
NI 9474 Getting Started Guide | © National Instruments | 17

Where to Go Next
CompactRIO NI CompactDAQ
Located at ni.com/manuals
RELATED INFORMATION
C Series Documentation
& Resources
ni.com/info cseriesdoc
Services
ni.com/services
Installs with the software
NI 9474 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9474 Datasheet
NI-DAQmx Help
LabVIEW Help
18 | ni.com | NI 9474 Getting Started Guide

Worldwide Support and Services
The NI website 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.
Visit ni.com/services for NI Factory Installation Services, repairs,
extended warranty, and other services.
Visit ni.com/register to register your NI product. Product
registration facilitates technical support and ensures that you
receive important information updates from NI.
A Declaration of Conformity (DoC) is our claim of compliance
with the Council of the European Communities using the
manufacturer’s declaration of conformity. This system affords the
user protection for electromagnetic compatibility (EMC) and
product safety. You can obtain the DoC for your product by
visiting ni.com/certification. If your product supports calibration,
you can obtain the calibration certificate for your product at
ni.com/calibration.
NI 9474 Getting Started Guide | © National Instruments | 19

NI corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504. NI
also has offices located around the world. For telephone support
in the United States, create your service request at ni.com/support
or dial 1 866 ASK MYNI (275 6964). For telephone support
outside the United States, visit the Worldwide Offices section of
ni.com/niglobal to access the branch office websites, which
provide up-to-date contact information, support phone numbers,
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Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on NI
trademarks. Other product and company names mentioned herein are trademarks or trade names
of their respective companies. For patents covering NI products/technology, refer to the
appropriate location: Help»Patents in your software, the patents.txt file on your media, or the
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license agreements (EULAs) and third-party legal notices in the readme file for your NI product.
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52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.
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373974D-01 Mar16