National Instruments NI 9351 Manuale utente
GETTING STARTED GUIDE
NI 9351
4-Ch 0-20 mA 16-bit AI, 4-Ch 24 V Sinking DI,
4-Ch 24 V Sourcing DO, SIL3 Capable
This document provides information about connecting and
installing the NI 9351 hardware. You must download a compiled
User Program before deployment. For information about creating
User Programs, deploying safety systems using the NI 9351, and
diagnostics available on the NI 9351, go to ni.com/info and enter
Info Code safetymanual.
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 9351. 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 9351 only as described in this document.
2| ni.com | NI 9351 Getting Started Guide
Caution This icon denotes a caution, which advises
you to consult documentation where this symbol is
marked.
Caution Do not operate the NI 9351 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.
Safety Voltages
Connect only voltages that are within the following limits:
Caution Do not connect hazardous voltages to the
NI 9351. A hazardous voltage is a voltage greater than
42.4 V peak voltage or 60 V DC to earth ground.
Maximum voltages
Vsup-to-COM 30 V DC
DI-to-COM 30 V DC
DO-to-COM 0 V DC to Vsup
NI 9351 Getting Started Guide | © National Instruments | 3
AI-to-COM 20 V DC
AI Vsup-to-COM 30 V DC
Caution DO channels are not protected for negative
voltages or voltages greater than Vsup.
Isolation voltages
Channel-to-earth1 (up to 5,000 m)
Continuous 60 V DC, Measurement
Category I
Withstand 1,000 V RMS, 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
1Channels include Vsup, AI Vsup, and COM.
4| ni.com | NI 9351 Getting Started Guide
equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9351 to signals or use
for measurements within Measurement Categories II,
III, or IV.
Note Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are for
other circuits not intended for direct connection to the
MAINS building installations of Measurement
Categories CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI 9351 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
Gc and Ex nA IIC T4 Gc hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9351 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.
NI 9351 Getting Started Guide | © National Instruments | 5
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, or Zone 2.
Caution The system must be installed in an enclosure
certified for the intended hazardous (classified)
location, having a tool secured cover/door, where a
minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9351 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 12 ATEX 1202658X and is IECEx UL 14.0089X
certified. Each NI 9351 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 9351 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.
6| ni.com | NI 9351 Getting Started Guide
Caution Transient protection shall be provided that is
set at a level not exceeding 140% of the peak rated
voltage value of 85 V at the supply terminals to the
equipment.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC/EN 60664-1.
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.
EMC 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.
NI 9351 Getting Started Guide | © National Instruments | 7
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
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.
Refer to the following guidelines to ensure specified EMC
performance.
Notice Operate this product only with shielded cables
and accessories.
Notice Keep the chassis ground connection to the
cable shield as short as possible.
8| ni.com | NI 9351 Getting Started Guide
Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications.
To verify marine approval certification for a product, visit ni.com/
certification and search for the certificate.
Notice 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.
Preparing the Environment
Ensure that the environment in which you are using the NI 9351
meets the following specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Operating humidity
(IEC 60068-2-30)
10% RH to 90% RH,
noncondensing
NI 9351 Getting Started Guide | © National Instruments | 9
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