National Instruments NI 9411 User manual

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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9411
6-Channel Differential Digital Input Module
ni.com/manuals
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NI 9411 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9411
and includes specifications and pin assignments for the NI 9411. 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 9411. 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 9411 Operating Instructions and Specifications
Safety Guidelines
Operate the NI 9411 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 9411 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 9411 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 9411 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 between the Vsupterminal and the COM terminal.
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
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 9411 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 9411 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 9411 Operating Instructions and Specifications 6 ni.com
Connecting the NI 9411
The NI 9411 has a 15-pin DSUB connector that provides
connections for 6 digital input channels.
Figure 1. NI 9411 Pin and Terminal Assignments
Vsup
COM
DI0a
DI1a
DI2a
Supply (+5 Vout)
Supply (+5 Vout)
DI3a
DI4a
DI5a
DI0b
DI1b
DI2b
COM
DI3b
DI4b
DI5b
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
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© National Instruments Corp. 7 NI 9411 Operating Instructions and Specifications
Each channel has two pins, DIa and DIb, to which youcan
connect digital input signals. The DSUB connector also provides
two connections for supplying power to an external device and
a connection for common. The NI 9411 also has a 2-terminal
screw-terminal connector that provides connections for an external
power supply.
If youdo not have a 5 V power supply to directly power the
external device or if youwant to simplify wiring, youcan connect
an external power supply to the Vsupand COM terminals on the
NI 9411 screw-terminal connector, and connect the external device
to one of the 5V
outpins. If the external device is already powered,
youdo not need to connect a power supply to the NI 9411 or
connect the +5 Voutpin to the external device. Refer to the
Specifications section for information about the external power
supply specifications.
Note Yo umust use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9411 screw-terminal connector.
Connecting Differential Devices to the NI 9411
Youcan connect differential devices to the NI 9411. Connect the
device to the DIa and DIb pins on the NI 9411. The NI 9411
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NI 9411 Operating Instructions and Specifications 8 ni.com
measures whether the difference between the DIa and DIb pins is
greater than or less than the digital logic levels. If the difference
between the pins is within the input high range, the channel
registers as high. If the difference between the pins is within the
input low range, the channel registers as low. Refer to the
Specifications section for more information about digital logic
levels. Figure 2 shows a possible configuration.
Figure 2. Connecting a Differential Device to the NI 9411
COM
Vsup COM
NI 9411
+
–
DIa
+5 V
out
DIb
–+
Differential
Device
External
Power Supply
+5 V
Reg
Receiver
Circuitry
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© National Instruments Corp. 9 NI 9411 Operating Instructions and Specifications
An example of a differential device is a differential encoder.
A differential encoder has phase A, phase B, and index signals.
Use the phase A signals to measure rotational speed. Use the
phase B signals to measure direction. Use the index signals to
measure the number of rotations.
Connect each of the signal pairs of the encoder (phase A, phase B,
and index) to a pair of DI pins. Figure 3 shows the connections for
one differential encoder.
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