National Instruments NI 9425 User manual

GETTING STARTED GUIDE
NI 9425
24 V, 32-Channel (Sinking Input), 7 µs C Series
Digital Module

This document explains how to connect to the NI 9425. In this
document, the NI 9425 with spring terminal and the NI 9425 with
DSUB are referred to inclusively as the NI 9425.
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 9425. 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 9425 only as described in this document.
Caution This icon denotes a caution, which advises
you to consult documentation where this symbol is
marked.
2| ni.com | NI 9425 Getting Started Guide

Caution Do not operate the NI 9425 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
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.
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 All wiring must be insulated for the highest
voltage used.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
NI 9425 Getting Started Guide | © National Instruments | 3

Caution Ensure 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), you must ensure
that devices and circuits connected to the module are
properly insulated from human contact.
NI 9425 with Spring Terminal Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels
simultaneously
±60 V maximum
All channels
simultaneously
±30 V maximum
Isolation
Channel-to-channel None
4| ni.com | NI 9425 Getting Started Guide

Channel-to-earth ground
Continuous 250 V RMS,
Measurement Category II
Withstand up to
5,000 m
3,000 V RMS, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
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 9425 with spring
terminal to signals or use for measurements within
Measurement Categories III or IV.
NI 9425 Getting Started Guide | © National Instruments | 5

NI 9425 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels
simultaneously
±60 V maximum
All channels
simultaneously
±30 V maximum
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC,
Measurement Category I
Withstand up to
2,000 m
1,000 V RMS, verified by a 5 s
dielectric withstand test
Withstand up to
5,000 m
500 V RMS, verified by a 5 s
dielectric withstand test
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
6| ni.com | NI 9425 Getting Started Guide

referred to as MAINS voltage. MAINS is a hazardous live
electrical supply system that powers equipment. This category is
for 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 9425 with DSUB to
signals or use for measurements within Measurement
Categories II, III, or IV.
Note Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are for
other circuits not intended for direct connection to the
MAINS building installations of Measurement
Categories CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI 9425 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
Gc and Ex nA IIC T4 Gc hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9425 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.
NI 9425 Getting Started Guide | © National Instruments | 7

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, or Zone 2.
Caution The system must be installed in an enclosure
certified for the intended hazardous (classified)
location, having a tool secured cover/door, where a
minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9425 with spring terminal has been evaluated as Ex nA
IIC T4 Gc equipment under DEMKO 12 ATEX 1202658X and is
IECEx UL 14.0089X certified. The NI 9425 with DSUB has been
evaluated as Ex nA IIC T4 Gc equipment under DEMKO 03
ATEX 0324020X and is IECEx UL 14.0089X certified. Each
NI 9425 is marked II 3G and is suitable for use in Zone 2
8| ni.com | NI 9425 Getting Started Guide

hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤
70 °C. If you are using the NI 9425 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.
Caution Transient protection shall be provided that is
set at a level not exceeding 140% of the peak rated
voltage value of 85 V at the supply terminals to the
equipment.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC/EN 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.
NI 9425 Getting Started Guide | © National Instruments | 9

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
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.
10 | ni.com | NI 9425 Getting Started Guide

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
and cables to ensure that the desired EMC performance
is attained.
NI 9425 Getting Started Guide | © National Instruments | 11

Preparing the Environment
Ensure that the environment in which you are using the NI 9425
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 5,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
12 | ni.com | NI 9425 Getting Started Guide

NI 9425 Pinout
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
DI0
DI1
DI3
DI5
DI7
DI9
DI11
DI13
DI15
COM
DI2
DI4
DI6
DI8
DI10
DI12
DI14
COM
DI17
DI16
DI18
DI20
DI22
DI24
DI26
DI28
DI30
NC
DI19
DI21
DI23
DI25
DI27
DI29
DI31
NC
DI16
DI17
DI18
DI19
DI20
DI21
DI22
DI23
COM
COM
DI24
DI25
DI26
DI27
DI28
DI29
DI30
DI31
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DO7
COM
COM
DI8
DI9
DI10
DI11
DI12
DI13
DI14
DI15
NC
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
NI 9425 Getting Started Guide | © National Instruments | 13

Table 1. Signal Descriptions
Signal Description
COM Common reference connection to isolated ground
DI Digital input signal connection
NC No connection
Connecting a Sourcing-Output Device
You can connect 2-, 3-, and 4-wire sourcing-output devices to the
NI 9425.
14 | ni.com | NI 9425 Getting Started Guide

NI 9425
+
_COM
DI
Sourcing-Output
Device
External
Power
Supply
Common
Mode
Voltage
The NI 9425 channel registers as ON when the sourcing-output
device applies a voltage or drives a current that is in the input ON
range to DI. The channel registers as OFF when the device
applies a voltage or drives a current that is in the input OFF range
to DI. If no device is connected to DI, the channel registers as
OFF.
NI 9425 Getting Started Guide | © National Instruments | 15

NI 9425 Connection Guidelines
• Make sure that devices you connect to the NI 9425 are
compatible with the module specifications.
• You must use 2-wire ferrules to create a secure connection
when connecting more than one wire to a single terminal on
the NI 9425 with spring terminal.
• For the NI 9425 with spring terminal, push the wire into the
terminal when using a solid wire or a stranded wire with a
ferrule.
• For the NI 9425 with spring terminal, open the terminal by
pressing the push button when using stranded wire without a
ferrule.
• For CAT II measurements, you must use a power supply with
isolated DC outputs if you are using an external power
supply.
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends
that you use the NI 9940 backshell kit to protect connections to
the NI 9425 with spring terminal.
16 | ni.com | NI 9425 Getting Started Guide

Where to Go Next
CompactRIO CompactDAQ
RELATED INFORMATION
C Series Documentation
& Resources
ni.com/info cseriesdoc
Services
ni.com/services
NI 9425 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9425 Datasheet
NI-DAQmx Help
LabVIEW Help
Installs with the software
Located at ni.com/manuals
NI 9425 Getting Started Guide | © National Instruments | 17

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.
18 | ni.com | NI 9425 Getting Started Guide

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,
email addresses, and current events.
NI 9425 Getting Started Guide | © National Instruments | 19

Information is subject to change without notice. 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 National Instruments Patent Notice at ni.com/
patents. You can find information about end-user license agreements (EULAs) and third-party
legal notices in the readme file for your NI product. Refer to the Export Compliance Information at
ni.com/legal/export-compliance for the NI global trade compliance policy and how to obtain
relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR
IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED
HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The
data contained in this manual was developed at private expense and is subject to the applicable
limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and
DFAR 252.227-7015.
© 2004—2017 National Instruments. All rights reserved.
373782J-01 April 28, 2017