National Instruments NI 9219 Manuale utente
OPERATING INSTRUCTIONS
NI 9219
4-Channel, 24-Bit, Universal Analog Input Module
NI 9219 Operating Instructions 2 ni.com
These operating instructions describe how to use the National
Instruments 9219. For information about installing, configuring,
and programming the system, refer to the system documentation.
Visit ni.com/info and enter the info code rdsoftwareversion
to determine which software you need for the modules you are
using.
Note The safety guidelines and specifications in this
document are specific to the NI 9219. 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.
Safety Guidelines
Operate the NI 9219 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.
© National Instruments Corp. 3 NI 9219 Operating Instructions
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), you must ensure that devices
and circuits connected to the module are properly insulated
from human contact. You must use the NI 9972 connector
backshell kit to ensure that the terminals are not accessible.
NI 9219 Operating Instructions 4 ni.com
Figure 1 shows the NI 9972 connector backshell.
Figure 1. NI 9972 Connector Backshell
Safety Guidelines for Hazardous Locations
The NI 9219 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
hazardous locations; and nonhazardous locations only. Follow
these guidelines if you are installing the NI 9219 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.
© National Instruments Corp. 5 NI 9219 Operating Instructions
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.
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/exit through opposing
enclosure walls.
NI 9219 Operating Instructions 6 ni.com
Wiring the NI 9219
The NI 9219 has four 6-terminal connectors that provide
connections for four analog input channels. Connect the positive
signal of the signal source to the positive input signal terminal (HI)
and the negative signal of the signal source to the negative input
signal terminal (LO). Use the excitation terminals if your sensor
requires a separate excitation connection. Refer to Table 1 for the
signal names and Table 2 for the terminal assignments for each
mode. Refer to the NI 9219 Circuitry section for information about
connections in each mode.
© National Instruments Corp. 7 NI 9219 Operating Instructions
Table 1. Signal Names
Module Terminal
Signal
Name Signal Description
1T+ TEDS Data
2T– TEDS COM
3EX+/HI*Positive excitation or
input signal
4HI Positive input signal
5EX–/LO*Negative excitation or
input signal
6LO Negative input signal
*Depending on the mode, terminals 3 and 5 are either the excitation signals or the
input signals.
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
Ch 0
Ch 1
Ch 2
Ch 3
NI 9219 Operating Instructions 8 ni.com
Table 2. Terminal Assignments
Mode
Terminal
123456
Voltage T+ T–—HI LO —
Current T+ T–HI —LO —
4-Wire Resistance T+ T–EX+ HI EX–LO
2-Wire Resistance T+ T–HI —LO —
Thermocouple T+ T–—HI LO —
4-Wire RTD T+ T–EX+ HI EX–LO
3-Wire RTD T+ T–EX+ —EX–LO
Quarter-Bridge T+ T–HI —LO —
Half-Bridge T+ T–EX+ HI EX–—
Full-Bridge T+ T–EX+ HI EX–LO
Digital In T+ T–—HI LO —
Open Contact T+ T–HI —LO —
© National Instruments Corp. 9 NI 9219 Operating Instructions
Connecting Wires to the NI 9219 Connectors
Use a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm
(0.09 × 0.04 in.) to connect wires to the detachable spring-terminal
connectors. Insert the screwdriver into a spring clamp activation
slot and press a wire into the corresponding connector terminal,
then remove the screwdriver to clamp the wire into the terminal.
Refer to the Specifications section for more information about
spring-terminal wiring. Refer to Figure 2 for an illustration of
connecting wires to the NI 9219.
Figure 2. Connecting Wires to the NI 9219 Connectors
NI 9219 Operating Instructions 10 ni.com
Wiring TEDS Channels
The NI 9219 supports only Class II
TEDS sensors. Connect the two
TEDS lines to
TEDS Data (T+) and TEDS COM (T–) and ensure
that neither T+ nor T– is tied in common to any of the signal inputs
(terminals 3 through 6) on the NI 9219. Visit ni.com/info and
enter the info code rdteds for information about TEDS sensors.
Grounding and Shielding Considerations
You can connect ground-referenced or floating signal sources to
the NI 9219. If you make a floating connection between the signal
source and the NI 9219, make sure the voltages on the positive and
negative connections are within the channel-to-earth working
voltage range to ensure proper operation of the NI 9219. Refer to
the Specifications section for more information about operating
voltages and overvoltage protection.
Note For best signal quality, National Instruments
recommends using shielded cables and twisted pair
wiring whenever possible.
Figures 3 and 4 illustrate connecting grounded and floating signal
sources to the NI 9219 in Voltage mode.
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