National Instruments NI 9475 User manual

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GETTING STARTED GUIDE
NI 9475
8-Channel, 60 V, High-Speed, Sourcing Digital
Output Module
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This document explains how to connect to the NI 9475.
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 9475. 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 9475 only as described in this document.
Caution Do not operate the NI 9475 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.
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Safety Voltages
Connect only voltages that are within the following limits:
Vsup-to-COM 60 VDC max,
Measurement Category I
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 VDC,
Measurement Category I
Withstand 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
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.
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Caution Do not connect the NI 9475 to signals or use
for measurements within Measurement Categories II,
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.
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.
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Safety Guidelines for Hazardous Locations
The NI 9475 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 9475 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.
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.
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Caution For Division 2 and Zone 2 applications,
install a protection device between the input signal and
the input pin. The device must prevent the input Vsup-
to-COM voltage from exceeding 84 V if there is a
transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9475 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx UL 14.0089X certified. Each NI 9475 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 9475
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 60664-1.
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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
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
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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.
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Preparing the Environment
Ensure that the environment in which you are using the NI 9475
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.
Connecting the NI 9475
The NI 9475 provides connections for eight digital output
channels.
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Figure 1. NI 9475 Pinout
COM
Vsup
COM
COM
Vsup
COM
COM
Vsup
COM
COM
Vsup
COM
COM
DO0
Vsup
DO1
DO2
Vsup
DO3
DO4
Vsup
DO5
DO6
Vsup
DO7
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
03
4 7
Signals
Each channel of the NI 9475 has a DO pin to which you can
connect a device. Each channel also has a COM pin and a Vsup
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pin. NI recommends you provide independent COM and Vsup
wiring for each channel to minimize current flow in the COM
and Vsup wiring. The COM pins are all connected together
internally.
Each channel has an LED that indicates the state of the channel.
When a channel LED is lit, the channel is on. When the LED is
dark, the channel is off.
Connecting an External Power Supply
You must connect an external power supply to the NI 9475. This
power supply provides the current for the devices you connect to
the module. Connect the positive lead of the power supply to
Vsup and 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.
The NI 9475 has current sourcing outputs, which means the DO
pin is driven to Vsup when the channel is turned on.
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Connecting a Device
You can directly connect the NI 9475 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9475 are compatible
with the output specifications of the module.
Connect the device to DO and connect the common of the device
to COM.
Figure 2. Connecting a Device to the NI 9475
External
Power
Supply
Device
COM
DO
Vsup
NI 9475
+
–
Note When the 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
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ni.com/info and enter the Info Code
CSeriesDOPulseGen for more information.
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
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 A rating.
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Figure 3. Increasing the Current to a Device Connected to the NI 9475
NI 9475
DO3
DO1
DO0
DO2
4 A
+
_
COM
1 A
1 A
1 A
1 A
External
Power
Supply
Device
Vsup
I/O Protection
The NI 9475 provides overcurrent protection.
Each channel has circuitry that protects it from current surges
resulting from short circuits, as described in the following table.
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Table 1. Overcurrent Channel Protection Behavior
Amount of Current
through the DO Terminal
or Pin Channel Behavior
Greater than 13 A The channel trips and goes into an
overcurrent state, in which the channel
turns off and the module is not damaged.
Between 6 A and 13 A The state of the channel is indeterminate
and depends on factors such as the current
level, temperature, and power supply.
Higher inrush currents that
exist for less than the trip
time
The circuit protection does not trip.
Note Refer to the NI 9475 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.
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Note Refer to the IEC 61131-2 standard for more
information about short-circuit-proof devices.
Note Because the NI 9475 includes internal flyback
diodes, you do not need to add external diodes when
connecting to switching devices that store energy.
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.
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 9475.
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If the power supply you are using with the NI 9475 cannot supply
more than 13 A, the module may be damaged if a short-circuit
condition occurs.
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 module. However, doing so disconnects power from all the
module channels.
Normal operation can resume after you correct the overcurrent
condition and reset the channel.
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Where to Go Next
Located at ni.com/manuals Installs with the software
CompactRIO NI CompactDAQ
RELATED INFORMATION
Services
ni.com/services
NI 9475 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9475 Datasheet
NI-DAQmx Help
LabVIEW Help
C Series Documentation
& Resources
ni.com/info cseriesdoc
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Worldwide Support and Services
The National Instruments 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 National Instruments
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.
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