National Instruments NI 9265 Manuale utente
OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9265
4-Channel, 0–20 mA, 16-Bit Analog Current Output
Module
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NI 9265 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9265
and includes specifications and terminal assignments for the
NI 9265. 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 9265. 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.
Safety Guidelines
Operate the NI 9265 only as described in these operating
instructions.
© National Instruments Corp. 3 NI 9265 Operating Instructions and Specifications
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 Vpk or 60 VDC to earth ground.
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 (>42.4 Vpk/60 VDC), youmust ensure that devices
and circuits connected to the module are properly
insulated from human contact. Youmust use the NI 9932
connector backshell kit to ensure that the terminals are
not accessible.
NI 9265 Operating Instructions and Specifications 4 ni.com
Figure 1 shows the NI 9932 connector backshell.
Figure 1. NI 9932 Connector Backshell
Safety Guidelines for Hazardous Locations
The NI 9265 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 9265 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.
© National Instruments Corp. 5 NI 9265 Operating Instructions and Specifications
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.
Caution For Zone 2 applications, connected signals must
be within the following limits:
Capacitance .......................... 80 nF max
Inductance ............................ 0.2 H max
NI 9265 Operating Instructions and Specifications 6 ni.com
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx 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. If youare using the NI 9265 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.
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.
© National Instruments Corp. 7 NI 9265 Operating Instructions and Specifications
Connecting the NI 9265
The NI 9265 has a 10-terminal, detachable screw-terminal
connector that provides connections for 4 analog output channels.
Figure 2. NI 9265 Terminal Assignments
AO0
COM0
AO1
COM1
AO2
COM2
AO3
COM3
Vsup
Power Supply COM
0
1
2
3
4
5
6
7
8
9
NI 9265 Operating Instructions and Specifications 8 ni.com
The NI 9265 has four analog output channels, AO. Each channel
has a common terminal, COM, that is internally connected to the
isolated ground reference of the module. The 9265 also has a
terminal for an external power supply, Vsup, and an external power
supply common terminal, Power Supply COM.
Each AO channel has a digital-to-analog converter (DAC) that
produces a current signal. Each channel also has overvoltage and
short-circuit protection. Refer to the Specifications section for
more information about the overvoltage and short-circuit
protection. Refer to Figure 3 for an illustration of the output
circuitry for one channel of the NI 9265.
Yo ucan connect a load to each channel of the NI 9265. Connect the
positive lead of the load to the AO terminal. Connect the ground of
the load to the corresponding COM terminal. Refer to Figure 3 for
an illustration of how to connect a load to the NI 9265.
© National Instruments Corp. 9 NI 9265 Operating Instructions and Specifications
Figure 3. Connecting a Load to the NI 9265
Note Youmust use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9265.
AO
COM
NI 9265
Isolated DAC
External
Power Supply
+
_
Vsup
Power
Supply
COM
Load
Protection
DC/DC
NI 9265 Operating Instructions and Specifications 10 ni.com
Yo umust connect an external power supply to the NI 9265. This
power supply provides the current for the devices youconnect to
the module. Connect the positive lead of the power supply to the
supply terminal, Vsup, and the negative lead of the power supply to
Power Supply COM.
When the module powers on, the channels output the startup
current. Refer to the Specifications section for more information
about startup current. Refer to the software help for information
about configuring startup output states in software. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments
recommends that youeither use ferrules to terminate wires to the
detachable screw-terminal connector or use the NI 9932 backshell
kit to protect the connections. Refer to Figure 4 for an illustration
of using ferrules. Refer to Figure 1 for an illustration of the
NI 9932 connector backshell.
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