National Instruments C Series Manuale utente
GETTING STARTED GUIDE
NI 9467
C Series GPS Synchronization Module
This document explains how to connect to the NI 9467.
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 9467. 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 9467 only as described in this document.
Caution Do not operate the NI 9467 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.
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Safety Guidelines for Hazardous Locations
The NI 9467 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 9467 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 Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
NI 9467 Getting Started Guide | © National Instruments | 3
Caution For Division 2 and Zone 2 applications,
install a protection device between the external power
supply and the Vsup pin. The device must prevent the
Vsup-to-COM voltage from exceeding 50 V if there is
a transient overvoltage condition.
Special Conditions for Hazardous Locations Use in
Europe and Internationally
The NI 9467 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx UL 14.0089X certified. Each NI 9467 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 9467
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.
Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
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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.
Electromagnetic Compatibility 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.
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.
NI 9467 Getting Started Guide | © National Instruments | 5
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.
Caution To ensure the specified EMC performance,
operate this product only with shielded cables and
accessories.
Special Conditions 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.
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.
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NI 9467 Overview
The NI 9467 is a stationary GPS timing module for C Series
platforms. It provides accurate timing and geographic location
information to the C Series host, which enables synchronization
of C Series systems.
Start-Up Behavior
At start-up, the NI 9467 automatically begins determining its
location through a process known as self-survey. During the self-
survey, the module computes a location fix every second and
averages the locations at the end to obtain a more accurate
location. After the self-survey, the NI 9467 no longer computes
new location fixes; it uses its known location and satellite signals
to generate accurate timing signals.
Like all GPS receivers, the NI 9467 requires GPS satellite
ephemeris and almanac data to compute accurate time and
location. The ephemeris is detailed orbital information about each
satellite (where each satellite is expected to be at a given time).
The almanac data describes the general health of each satellite
NI 9467 Getting Started Guide | © National Instruments | 7
(for example, the receiver must not use signals from satellites
marked as unhealthy) and contains coarse orbit information. The
GPS satellites broadcast the ephemeris and almanac data every
30 seconds. Therefore, it usually takes approximately 30 seconds
for it to receive the ephemeris and almanac data and start
computing location and timing fixes.
Status LED
The NI 9467 has a front panel LED to indicate status. The
following table describes the meaning of each LED pattern.
Conditions LED State
Normal operation Solid green
Performing survey Blinking green
Not enough or no satellites Blinking yellow
Antenna error (no antenna or over-current) Solid yellow
Unconfigured Off
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Note Although the module may not detect the
presence of very low-power GPS antennas, it can still
function correctly. Note that the LED and software may
report antenna error under these conditions, and if the
current consumed is close to the detection threshold the
LED may flicker. Refer to the Specifications section for
more details.
Connecting the NI 9467
The NI 9467 has one SMA female connector on its front panel
for a GPS active antenna. The connector provides a DC voltage
to power the antenna and also serves as input for the GPS RF
signal.
Installing the Antenna
Caution National Instruments recommends using a
lightning arrester in line with the GPS antenna
installation to protect the NI 9467 and the C Series
system from possible damage and operators from injury
in the event of lightning.
NI 9467 Getting Started Guide | © National Instruments | 9
The embedded GPS receiver in the NI 9467 requires signals from
several satellites to compute accurate timing and location. The
more satellites available to the receiver, the more accurately it
can determine time and location. Therefore, the antenna location
should be such that it receives signals from the greatest number
of satellites possible. As the number of satellites visible to the
antenna decreases, the synchronization performance may also
decrease. Choose the antenna location so that the antenna has a
clear view of the sky. There is no strict definition for a clear view
of the sky, but a suitable guideline is that the GPS antenna should
have a straight line of sight to the sky in all directions (360°)
down to an imaginary line making a 30° angle with the ground.
Locations far from trees and tall buildings that could block or
reflect GPS satellite signals are best.
Maximum Cable Length
Maximum cable length depends on the GPS antenna gain and the
cable’s loss per unit of distance. National Instruments
recommends a GPS signal strength of between -135 dBm and
-120 dBm at the NI 9467 SMA input. GPS signal strength on the
Earth’s surface is typically -130 dBm. Targeting a signal strength
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