National Instruments NI 9375 Getting Started Manual

GETTING STARTED GUIDE

NI 9375

16 DI/16 DO, 30 VDC, 7 μs Sinking DI, 500 μs
Sourcing DO

This document explains how to connect to the NI 9375. In this
document, the NI 9375 with spring terminal and the NI 9375 with
DSUB are referred to inclusively as the NI 9375.

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 9375. 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.

Caution Electrostatic Discharge (ESD) can damage

the NI 9375 with spring terminal. To prevent damage,
use industry-standard ESD prevention measures during
installation, maintenance, and operation.

Safety Guidelines

Operate the NI 9375 only as described in this document.

2 | ni.com | NI 9375 Getting Started Guide

Caution Do not operate the NI 9375 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.

Safety Voltages

Connect only voltages that are within the following limits:

NI 9375 with Spring Terminal Isolation Voltages

Channel-to-channel None

Channel-to-earth ground

Continuous 250 Vrms,

Measurement Category II

Withstand up to
4,000 m

3,000 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.
This category refers to local-level electrical distribution, such as

NI 9375 Getting Started Guide | © National Instruments | 3

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 9375 with spring

terminal to signals or use for measurements within
Measurement Categories III or IV.

NI 9375 with DSUB Isolation Voltages

Channel-to-COM or
Vsup-to-COM

30 VDC maximum

Isolation

DI bank-to-DO bank 60 VDC maximum

Channel-to-Channel No isolation between channels

Channel-to-earth ground

Continuous 60 VDC,

Measurement Category I

Withstand up to
2,000 m

1,000 Vrms, 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
referred to as MAINS voltage. MAINS is a hazardous live

4 | ni.com | NI 9375 Getting Started Guide

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 9375 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 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 9375 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 9375 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.

NI 9375 Getting Started Guide | © National Instruments | 5

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 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 any two terminals.
The device must prevent the 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 9375 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 07 ATEX 0626664X and is IECEx UL 14.0089X

6 | ni.com | NI 9375 Getting Started Guide

certified. Each NI 9375 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 9375 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 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/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 9375 Getting Started Guide | © National Instruments | 7

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.

8 | ni.com | NI 9375 Getting Started Guide

Caution To ensure the specified EMC performance,

operate this product only with shielded cables and
accessories.

Caution To ensure the specified EMC performance,

the length of all I/O cables must be no longer than 30 m
(100 ft).

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 9375 Getting Started Guide | © National Instruments | 9

Preparing the Environment

Ensure that the environment in which you are using the NI 9375
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

For NI 9375 with
spring terminal

4,000 m

For NI 9375 with
DSUB

2,000 m

Indoor use only.

Note Refer to the device datasheet on ni.com/manuals

for complete specifications.

10 | ni.com | NI 9375 Getting Started Guide

NI 9375 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

DI8
DI9
DI10
DI11
DI12
DI13
DI14
DI15

NC
DO COM
DO8

DO9
DO10
DO11
DO12
DO13
DO14
DO15

DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
DI COM
NC
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7

V

sup

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

DI0
DI1

DI3

DI5

DI7

DO0

DO2

DO4

DO6

DO COM

DI2

DI4

DI6

DI COM

DO1

DO3

DO5

DO7

DI9

DI8

DI10

DI12

DI14

NC

DO9

DO11

DO13

DO15

DI11

DI13

DI15

DO8

DO10

DO12

DO14

Vsup

NI 9375 Getting Started Guide | © National Instruments | 11

Table 1. Signal Descriptions

Signal Description

DI Digital input signal connection

DI COM Common reference connection for the digital inputs

DO Digital output signal connection

DO COM Common reference connection for the digital outputs

NC No connection

Vsup Voltage supply connection

12 | ni.com | NI 9375 Getting Started Guide

Sourcing-Output Connections

NI 9375

External

Power

Supply

+

–

Sourcing-Output

Device

DI COM

DI

The NI 9375 channel registers as ON when the sourcing-output
device drives enough current or applies enough voltage to DI. If
no device is connected to DI, the channel registers as OFF.

Connecting Digital Devices

You can connect a variety of industrial devices, such as solenoids,
motors, actuators, relays, and lamps to the NI 9375. You must
connect an external power supply to the NI 9375. The power
supply provides the current for the output channels.

NI 9375 Getting Started Guide | © National Instruments | 13

Figure 1. Connecting an Industrial Device to the NI 9375

NI 9375

Device

V

sup

DO

DO COM

External

Power

Supply

+

–

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.

Ensure that the devices you connect to the NI 9375 are
compatible with the output specifications of the NI 9375. 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.

14 | ni.com | NI 9375 Getting Started Guide

Protecting the Digital Outputs from Flyback
Voltages

If the channel 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.

Figure 2. Connecting a Flyback Diode

NI 9375

External

Power

Supply

+

–

DO COM

V

sup

Inductive

Device

DO

Flyback
Diode

NI 9375 Getting Started Guide | © National Instruments | 15

NI 9375 Connection Guidelines

• Make sure that devices you connect to the NI 9375 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 9375 with spring terminal.

• For the NI 9375 with spring terminal, push the wire into the
terminal when using a solid wire or a stranded wire with a
ferrule.

• For the NI 9375 with spring terminal, open the terminal by
pressing the push button when using stranded wire without a
ferrule.

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 9375 with spring terminal.

16 | ni.com | NI 9375 Getting Started Guide

I/O Protection

Each DO channel on the NI 9375 has circuitry that protects it
from overcurrents resulting from a short-circuit or faulty loads.

Caution Overvoltage and reverse bias voltage

conditions can damage the NI 9375. Check the voltage
specifications for all devices that you connect to the
NI 9375.

When a short circuit is present on a digital output channel, the
DO channel cycles off and on until the short circuit is removed or
the current returns to an acceptably low level. An overcurrent
state can affect the performance of the NI 9375 and other
modules in the system. To ensure safe and proper operation, the
digital outputs should not exceed the maximum continuous
output current specification.

NI 9375 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 9375 Datasheet

NI-RIO Help

LabVIEW FPGA Help

NI 9375 Datasheet

NI-DAQmx Help

LabVIEW Help

18 | ni.com | NI 9375 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 9375 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,
email addresses, and current events.

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.

© 2017 National Instruments. All rights reserved.

378026A-01 Jan17