National Instruments 9477 Manuale utente
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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9477
32-Channel, 0–60 V, Sinking Digital Output Module
ni.com/manuals
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NI 9477 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9477
and includes specifications and pin assignments for the NI 9477.
Visit ni.com/info and enter rdsoftwareversion to determine
which software youneed for the modules youare using. For
information about installing, configuring, and programming the
system, refer to the system documentation. Visit ni.com/info
and enter cseriesdoc for information about C Series
documentation.
Note The safety guidelines and specifications in this
document are specific to the NI 9477. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.
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© National Instruments Corp. 3 NI 9477 Operating Instructions and Specifications
Safety Guidelines
Operate the NI 9477 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Locations
The NI 9477 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and
Ex nC IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if youare installing the NI 9477 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.
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NI 9477 Operating Instructions and Specifications 4 ni.com
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection
device across the external power supply and the COM
pin. The device must prevent the external power supply
voltage from exceeding 80 V if there is a transient
overvoltage condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
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 9477 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as
Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4
equipment.
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© National Instruments Corp. 5 NI 9477 Operating Instructions and Specifications
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification,
visit ni.com/certification and search for the LR certificate,
or look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
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NI 9477 Operating Instructions and Specifications 6 ni.com
Connecting the NI 9477
The NI 9477 has a 37-pin DSUB connector that provides
connections for 32 digital output channels.
Figure 1. NI 9477 Pin Assignments
DO16
DO17
DO18
DO19
DO20
DO21
DO22
DO23
COM
COM
DO24
DO25
DO26
DO27
DO28
DO29
DO30
DO31
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
COM
COM
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
NC
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
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© National Instruments Corp. 7 NI 9477 Operating Instructions and Specifications
Each channel of the NI 9477 has a DO pin to which youcan
connect a digital input device, and the module also has four COM
pins. The NI 9477 has current sinking outputs, meaning the DO pin
is driven to COM when the channel is turned on.
Yo ucan directly connect the NI 9477 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices youconnect to the NI 9477 are compatible
with the output specifications of the module. Refer to the
Specifications section for more information about the output
specifications.
Note National Instruments recommends youuse cables
and connectors that are suitably rated for the 20 A module
output current limit. Refer to the Specifications section
for information about output current limits.
Connect the device to DO and the positive lead of the external
power supply, and connect the negative lead of the power supply to
the four COM pins, as shown in Figure 2.
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NI 9477 Operating Instructions and Specifications 8 ni.com
Figure 2. Connecting a Device to the NI 9477
Increasing Current Drive
Each channel has a continuous output current of 1 A. If youwant
to increase the output current to a device, youcan connect any
number of channels together in parallel. For example, if youwant
to drive 4 A of current, connect DO<0..3> in parallel as shown
in Figure 3. Youmust turn all parallel channels on and off
simultaneously so that the current on any single channel cannot
exceed the 1 A rating.
Device
+
–
NI 9477
COM
DO
External
Power
Supply
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© National Instruments Corp. 9 NI 9477 Operating Instructions and Specifications
Note Yo umust keep the module within the 20 A module
output current limit. Driving 1 A on more than 20 channels
would overload the module. Refer to the Specifications
section for information about output current limits.
Figure 3. Increasing the Current to a Device Connected to the NI 9477
NI 9477
DO3
DO1
DO0
DO2
4 A
+
_
COM
1 A
1 A
1 A
1 A
External
Power
Supply
Device
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