National Instruments NI 9239, NI 9229 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9229/9239

4-Channel, ±60/±10 V, 24-Bit Simultaneous,
Channel-to-Channel Isolated Analog Input Modules

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ni.com/manuals

This document describes how to use the National Instruments 9229
and National Instruments 9239 and includes specifications and
terminal assignments. In this document, the NI 9229 and NI 9239
are referred to inclusively as the NI 9229/9239. Visit

ni.com/info and enter rdsoftwareversion to determine

which software you need for the modules you are using. For
information about installing, configuring, and programming the
system, refer to the system documentation. Visit
and enter

cseriesdoc for information about C Series

ni.com/info

documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9229/9239. 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.

NI 9229/9239 2 ni.com

Safety Guidelines

Operate the NI 9229/9239 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 Voltages

If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 V

© National Instruments Corp. 3 NI 9229/9239

or 60 VDC to earth ground.

pk

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 Make sure that devices and circuits connected to

the module are properly insulated from human contact.

Caution When module terminals are hazardous voltage

LIVE (>42.4V

/60 VDC), you must ensure that devices

pk

and circuits connected to the module are properly
insulated from human contact. You must use the NI 9971
connector backshell kit to ensure that the terminals are
not accessible.

Figure 1 shows the NI 9971 connector backshell.

Figure 1. NI 9971 Connector Backshell

NI 9229/9239 4 ni.com

Safety Guidelines for Hazardous Locations

The NI 9229/9239 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 9229/9239 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 Zone 2 applications, install the system

in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.

© National Instruments Corp. 5 NI 9229/9239

Caution For Zone 2 applications, install a protection

device between the input signal and the NI 9229/9239
input terminal. The device must prevent the input
channel-to-COM voltage from exceeding 85 V if there is
a transient overvoltage condition.

Caution For Zone 2 applications, connected signals must

be within the following limit:

Capacitance .......................... 0.01 μF max

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. If you are using the NI 9229/9239 in Gas
Group IIC hazardous locations or in ambient temperatures of
–40 °C ≤ Ta ≤ 70 °C, you must use the device in an NI chassis that
has been evaluated as EEx nC IIC T4, Ex nA IIC T4, or
Ex nL IIC T4 equipment.

NI 9229/9239 6 ni.com

Special Conditions for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, go to

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.

© National Instruments Corp. 7 NI 9229/9239

Connecting the NI 9229/9239

The NI 9229/9239 provides connections for four simultaneously
sampled, isolated analog input channels.

AI0+

0

AI0–

1

AI1+

0

AI1–

1

AI2+

0

AI2–

1

AI3+

0

AI3–

1

Figure 2. NI 9229/9239 Terminal Assignments

NI 9229/9239 8 ni.com

The NI 9229/9239 has four 2-terminal detachable screw-terminal
connectors.

Note Yo u must use 2-wire ferrules to create a secure

connection when connecting more than one wire to a
single terminal on the NI 9229/9239.

Yo u can connect ground-referenced or floating signal sources to
the NI 9229/9239. Connect the positive signal of the signal source
to the AI+ terminal or connector, and connect the negative signal
of the signal source to the AI– terminal or connector. If you make
a ground-referenced connection between the signal source and the
NI 9229/9239, 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 9229/9239. Refer to the

Specifications section for more information about operating

voltages and overvoltage protection. Refer to Figures 3 and 4 for
illustrations of how to connect grounded and floating signal
sources to the NI 9229/9239.

© National Instruments Corp. 9 NI 9229/9239

Signal

Source

+

–

AI+

AI–

NI 9229/9239

Figure 3. Connecting a Grounded Signal Source to the NI 9229/9239

Signal

Source

+

–

Figure 4. Connecting a Floating Signal Source to the NI 9229/9239

NI 9229/9239 10 ni.com

AI+

AI–

NI 9229/9239

The NI 9229/9239 analog input channels are floating with respect
to earth ground and each other. The incoming analog signal on each
channel is conditioned, buffered, and then sampled by a 24-bit
Delta-Sigma ADC.

Each channel provides an independent signal path and ADC,
enabling you to sample all four channels simultaneously. Refer to
Figure 5 for an illustration of the circuitry for one channel.

AI+

AI–

Overvoltage

Protection

Amplifier

ADC

Prefilter

NI 9229/9239

Figure 5. Input Circuitry for One Channel of the NI 9229/9239

© National Instruments Corp. 11 NI 9229/9239