NI 9476 User manual

GETTING STARTED GUIDE
NI 9476
36 V, 32-Channel (Sourcing Output), 500 µs
C Series Digital Module

This document explains how to connect to the NI 9476. In this
document, the NI 9476 with spring terminal and the NI 9476 with
DSUB are referred to inclusively as the NI 9476.
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 9476. 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 9476 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 9476 Getting Started Guide

Caution Do not operate the NI 9476 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 9476 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 9476 with Spring Terminal Safety Voltages
Connect only voltages that are within the following limits.
Vsup-to-COM 40 V DC maximum
DO VCOM ≤ VDO ≤ Vsup
Isolation
Channel-to-channel None
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
4| ni.com | NI 9476 Getting Started Guide

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 9476 with spring
terminal to signals or use for measurements within
Measurement Categories III or IV.
NI 9476 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Vsup-to-COM 40 V DC maximum
DO VCOM ≤ VDO ≤ Vsup
Isolation
Channel-to-channel None
NI 9476 Getting Started Guide | © National Instruments | 5

Channel-to-earth ground
Continuous 60 V DC,
Measurement Category 1
Withstand up to
2,000 m
1,000 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
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 9476 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
6| ni.com | NI 9476 Getting Started Guide

MAINS building installations of Measurement
Categories CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI 9476 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 9476 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.
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)
NI 9476 Getting Started Guide | © National Instruments | 7

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 9476 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 9476 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 9476 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 9476 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.
8| ni.com | NI 9476 Getting Started Guide

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.
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
NI 9476 Getting Started Guide | © National Instruments | 9

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
and cables to ensure that the desired EMC performance
is attained.
10 | ni.com | NI 9476 Getting Started Guide

Preparing the Environment
Ensure that the environment in which you are using the NI 9476
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
NI 9476 with spring
terminal
5,000 m
NI 9476 with DSUB 2,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals
for complete specifications.
NI 9476 Getting Started Guide | © National Instruments | 11

NI 9476 Pinout
DO16
DO17
DO18
DO19
DO20
DO21
DO22
DO23
Vsup
Vsup
DO24
DO25
DO26
DO27
DO28
DO29
DO30
DO31
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
Vsup
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
COM
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
DO0
DO1
DO3
DO5
DO7
DO9
DO11
DO13
DO15
COM
DO2
DO4
DO6
DO8
DO10
DO12
DO14
COM
DO17
DO16
DO18
DO20
DO22
DO24
DO26
DO28
DO30
Vsup
DO19
DO21
DO23
DO25
DO27
DO29
DO31
Vsup
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
12 | ni.com | NI 9476 Getting Started Guide

Table 1. Signal Descriptions
Signal Description
COM Common reference connection
DO Digital output signal connection
Vsup Voltage supply input connection
Connecting a Device
Connect the device to DO and COM, and connect the external
power supply to Vsup and COM.
NI 9476 Getting Started Guide | © National Instruments | 13

NI 9476
+
_
COM
Vsup
Device
DO
External
Power
Supply
Common
Mode
Voltage
Note When DO is off, DO is not connected to COM.
For devices with 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.
Connecting an External Power Supply
You must connect an external power supply with a 6 V DC to
36 V DC voltage range to the NI 9476. This power supply
provides the current for the devices you connect to the module.
You can connect only one external voltage supply to the NI 9476.
14 | ni.com | NI 9476 Getting Started Guide

1. Connect the positive lead of the power supply to Vsup.
2. Connect the negative lead of the power supply to COM.
Caution Do not remove or insert modules if the
external power supply connected to the Vsup and COM
pins is powered on.
Connection Guidelines
• Make sure that devices you connect to the NI 9476 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 9476.
• For the NI 9476 with spring terminal, push the wire into the
terminal when using a solid wire or a stranded wire with a
ferrule.
• For the NI 9476 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.
NI 9476 Getting Started Guide | © National Instruments | 15

Overvoltage Protection
The NI 9476 provides overvoltage protection between any two
inputs.
Note Refer to the device datasheet on ni.com/manuals
for more information about overvoltage protection.
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 9476 with spring terminal.
I/O Protection
The NI 9476 is protected against overcurrent, inrush, and short-
circuit conditions in accordance with IEC 61131-2.
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
16 | ni.com | NI 9476 Getting Started Guide

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.
Each channel has a status line that indicates in software whether
the channel is in an overcurrent state.
Protecting the Module from Flyback Voltages
Install an external flyback diode if the NI 9476 is switching an
inductive or energy-storing device such as a solenoid, motor, or
relay, and the device does not have flyback protection.
NI 9476 Getting Started Guide | © National Instruments | 17

External
Power
Supply
NI 9476
+
_
COM
Vsup
Inductive
Device
DO
Flyback
Diode
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. You
must turn all parallel channels on and off simultaneously so that
the current on any single channel cannot exceed the 250 mA
rating.
18 | ni.com | NI 9476 Getting Started Guide

NI 9476
250 mA
250 mA
250 mA
250 mA
DO3
DO1
DO0
DO2
1 A +
_
Device
COM
External
Power
Supply
Vsup
NI 9476 Getting Started Guide | © National Instruments | 19

Where to Go Next
CompactRIO 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 9476 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9476 Datasheet
NI-DAQmx Help
LabVIEW Help
20 | ni.com | NI 9476 Getting Started Guide