National Instruments NI 9222 User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9222/9223
4-Channel, ±10 V, 16-Bit Simultaneous,
Channel-to-Channel Isolated Analog Input Modules
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NI 9222/9223 2 ni.com
This document describes how to use the National Instruments 9222
and National Instruments 9223 and includes specifications and
terminal assignments for the NI 9222 and NI 9223. In this
document, the NI 9222 and NI 9223 are referred to inclusively as
the NI 9222/9223.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. Visit ni.com/info
and enter compatibility for information about chassis and
carrier compatibility for the modules youare using.
Note The safety guidelines and specifications in this
document are specific to the NI 9222/9223. 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.

© National Instruments Corp. 3 NI 9222/9223
Safety Guidelines
Operate the NI 9222/9223 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 9222/9223 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 youare
installing the NI 9222/9223 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.

NI 9222/9223 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.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate No. 07 ATEX 0626664X. 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 9222/9223 in Gas Group IIC hazardous locations,
youmust 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.

© National Instruments Corp. 5 NI 9222/9223
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
as stated in the product specifications. These requirements and
limits are designed to provide reasonable protection against
harmful interference when the product is operated in its intended
operational electromagnetic environment. There is no guarantee
that interference will not occur in a particular installation. To
minimize the potential for the product to cause interference to radio
and television reception or to experience unacceptable
performance degradation, install and use this product in strict
accordance with the instructions in the product documentation.
The following statements contain important information needed
before installing and using this product:
Caution This product is intended for use in industrial
locations. As a result, this product may cause interference
if used in residential areas. Such use must be avoided
unless the user takes special measures to reduce
electromagnetic emissions to prevent interference to the
reception of radio and television broadcasts.

NI 9222/9223 6 ni.com
Caution Emissions that exceed the regulatory
requirements may occur when this product is connected
to a test object.
Caution Changes or modifications not expressly
approved by National Instruments could void the user’s
authority to operate the hardware under the local
regulatory rules.
Special Guidelines 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 label.
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.

© National Instruments Corp. 7 NI 9222/9223
Connecting the NI 9222/9223
The NI 9222/9223 provides connections for four simultaneously
sampled, isolated analog input channels.
Figure 1. NI 9222/9223 Terminal Assignments
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
0
1
0
1
0
1
0
1

NI 9222/9223 8 ni.com
Caution Electrostatic Discharge (ESD) can damage this
product. To prevent damage, use industry-standard ESD
prevention measures during installation, maintenance,
and operation.
The NI 9222/9223 has four 2-terminal detachable screw-terminal
connectors.
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 9222/9223.
Yo ucan connect ground-referenced or floating signal sources to
the NI 9222/9223. Connect the positive signal of the signal source
to the AI+ terminal, and connect the negative signal of the signal
source to the AI– terminal. If youmake a ground-referenced
connection between the signal source and the NI 9222/9223, make
sure the voltage on the AI+ and AI– connections are in the
channel-to-earth safety voltage range to ensure proper operation of
the NI 9222/9223. Refer to the Specifications section for more
information about operating voltages and overvoltage protection.
Refer to Figures 2 and 3 for illustrations of how to connect
grounded and floating signal sources to the NI 9222/9223.

© National Instruments Corp. 9 NI 9222/9223
Figure 2. Connecting a Grounded Signal Source to the NI 9222/9223
Figure 3. Connecting a Floating Signal Source to the NI 9222/9223
NI 9222/9223
Signal
Source
AI–
+
–
AI+
NI 9222/9223
Signal
Source
AI–
+
–
AI+

NI 9222/9223 10 ni.com
The NI 9222/9223 analog input channels are floating with respect
to earth ground and each other. The incoming analog signal on each
channel is buffered, conditioned, and then sampled by a 16-bit
successive approximation register ADC.
Each channel provides an independent signal path and ADC,
enabling youto sample all four channels simultaneously. Refer to
Figure 4 for an illustration of the circuitry for one channel.
Figure 4. Input Circuitry for One Channel of the NI 9222/9223
NI 9222/9223
AI+
AI–
ADC
Amplifier
Overvoltage
Protection