National Instruments NI 9219E User manual

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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9219E
4-Channel, 24-Bit, Universal Analog Input Module
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NI 9219E Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9219E
and includes dimensions, terminal assignments, and specifications for
the NI 9219E. 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 ni.com/info and
enter cseriesdoc for information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9219E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9219E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.
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© National Instruments Corp. 3 NI 9219E Operating Instructions and Specifications
NI 9219E Dimensions
The following figure shows the dimensions of the NI 9219E.
Figure 1. NI 9219E Dimensions in Millimeters (Inches)
73.4 (2.89)
0.0 (0.00)
0.0 (0.00)
26.7 (1.05) 58.4 (2.30) 66.0 (2.60)
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NI 9219E Operating Instructions and Specifications 4 ni.com
Connecting the NI 9219E
The NI 9219E has four 6-terminal spring-terminal connectors that
provide connections for four analog input channels.
Figure 2. NI 9219E Channel and Terminal Assignments
4
5
6
4
5
6
4
5
6
4
5
6
1
2
3
1
2
3
1
2
3
1
2
3
Ch 0
Ch 1
Ch 2
Ch 3
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© National Instruments Corp. 5 NI 9219E Operating Instructions and Specifications
Table 1. NI 9219E Signal Names
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.
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NI 9219E Operating Instructions and Specifications 6 ni.com
Table 2. NI 9219E Terminal Assignments by Mode
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 —
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© National Instruments Corp. 7 NI 9219E Operating Instructions and Specifications
Connecting the NI 9219E
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 the sensor requires a separate excitation connection.
Refer to the NI 9219E Circuitry section for information about
connections in each mode.
Connecting Wires to the Spring-Terminal 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 3 for an illustration of
connecting wires to the NI 9219E.
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NI 9219E Operating Instructions and Specifications 8 ni.com
Figure 3. Connecting Wires to the NI 9219E Spring-Terminal Connectors
Connecting TEDS Channels
The NI 9219E 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 9219E. Visit ni.com/
info and enter the info code rdteds for information about
TEDS sensors.
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© National Instruments Corp. 9 NI 9219E Operating Instructions and Specifications
Connecting Signal Sources to the NI 9219E
You can connect ground-referenced or floating signal sources to
the NI 9219E. If you make a floating connection between the signal
source and the NI 9219E, 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 9219E. 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.
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NI 9219E Operating Instructions and Specifications 10 ni.com
Figures 4 and 5 illustrate connecting grounded and floating signal
sources to the NI 9219E in Voltage mode.
Figure 4. Connecting a Grounded Signal Source to the NI 9219E
Figure 5. Connecting a Floating Signal Source to the NI 9219E
+
–
Twisted-Pair
Wiring
VSIG
VSIG Ground
Reference
Signal Source Shielding
HI
LO NI 9219E
+
–
Twisted-Pair
Wiring
V
SIG
Signal Source Shielding
HI
LO NI 9219E
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© National Instruments Corp. 11 NI 9219E Operating Instructions and Specifications
NI 9219E Circuitry
The NI 9219E is channel-to-channel isolated. Four 24-bit
analog-to-digital converters (ADCs) simultaneously sample all
four analog input channels. The NI 9219E enables an excitation
circuit for all input modes that require excitation, and reconfigures
the ADC and excitation circuits in each mode to accommodate
each type of sensor.
Figure 6. Input Circuitry for One Channel on the NI 9219E
Isolated
ADC
TEDS
1
2
+
–
CHx 3
6
NI 9219E
FilterMUX
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NI 9219E Operating Instructions and Specifications 12 ni.com
Voltage and Current Modes
In Voltage mode, the ADC measures voltage across the HI and LO
terminals. In Current mode, the NI 9219E computes current from
the voltage that the ADC measures across an internal shunt resistor.
Figure 7. Connections in Voltage, Current, and Digital In Modes
Current Mode
HI
LO
ADC
IRSH
NI 9219E
Voltage/Digital In Modes
HI
LO
ADC
V+
–
NI 9219E
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© National Instruments Corp. 13 NI 9219E Operating Instructions and Specifications
4-Wire Resistance and 4-Wire RTD Modes
In 4-Wire Resistance and 4-Wire RTD modes, the NI 9219E
sources a current, which varies based on the resistance of the load,
between the EX+ and EX– terminals. The NI 9219E computes
measured resistance from the resulting voltage reading. Lead wire
resistance does not affect these modes because a negligible amount
of current flows across the HI and LO terminals due to the high
input impedance of the ADC.
Figure 8. Connections in 4-Wire Resistance and 4-Wire RTD Modes
LO
HI
EX–
RTD/
Resistor
Wire
Wire
Wire
I
ADC
I
EX+
Wire
NI 9219E
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NI 9219E Operating Instructions and Specifications 14 ni.com
3-Wire RTD Mode
In 3-Wire RTD mode, the NI 9219E sources a current, which varies
based on the resistance of the load, between the EX+ and EX–
terminals. This mode compensates for lead wire resistance in
hardware if all the lead wires have the same resistance. The
NI 9219E applies a gain of 2x to the voltage across the negative
lead wire and the ADC uses this voltage as the negative reference
to cancel the resistance error across the positive lead wire.
Figure 9. Connections in 3-Wire RTD Mode
LO
EX+
EX–
RTD
Wire
Wire
Wire
I
x2
ADC
I
I
NI 9219E
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© National Instruments Corp. 15 NI 9219E Operating Instructions and Specifications
2-Wire Resistance and Quarter-Bridge Modes
In 2-Wire Resistance and Quarter-Bridge modes, the NI 9219E
sources a current, which varies based on the resistance of the load,
between the HI and LO terminals. The NI 9219E computes
measured resistance from the resulting voltage reading.
2-Wire Resistance and Quarter-Bridge modes do not compensate
for lead wire resistance.
Figure 10. Connections in 2-Wire Resistance and Quarter-Bridge Modes
LO
R
Wire
Wire I
ADC
I
HI
NI 9219E
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NI 9219E Operating Instructions and Specifications 16 ni.com
Half-Bridge and Full-Bridge Modes
In Half-Bridge mode, the HI input is referenced to EX–.
In Full-Bridge mode, the ADC reads the HI and LO inputs
differentially. Both modes use the internal voltage excitation to set
the input range of the ADC and return voltage readings that are
proportional to the excitation level. The internal excitation
voltage varies based on the resistance of the sensor. Refer to the
Specifications section for more information about excitation levels.
Figure 11. Connections in Half-Bridge and Full-Bridge Modes
1 The dotted line representsthe portion of the circuit that isconnected
only in Full-Bridge mode.
HI
LO
EX+
EX– NI 9219E
R
1
R
2
R
3
R
4
ADC
Wire
Wire
1
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© National Instruments Corp. 17 NI 9219E Operating Instructions and Specifications
Thermocouple Mode
In Thermocouple mode, the NI 9219E uses the ±125 mV range
of the ADC to return a voltage reading. Use shielded cables and
twisted pair wiring and ground the shielded cables. Each channel
has a built-in thermistor for cold-junction compensation (CJC)
calculations. For improved CJC sensor accuracy, operate the
NI 9219E in a stable temperature environment and avoid placing
heat sources near the module or its connectors. Visit ni.com/
info and enter cjcdatascaling for more information about
isothermal errors and scaling CJC data. Refer to the Specifications
section for more information about accuracy. The NI 9219E does
not support open thermocouple detection.
Figure 12. Connections in Thermocouple Mode
HI
LO
TC ADC
NI 9219E
+
–
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NI 9219E Operating Instructions and Specifications 18 ni.com
Digital In Mode
Digital In mode has a 60 V unipolar threshold that you can set
in software. Refer to the software help for information about
configuring the Digital In threshold. Visit ni.com/info and enter
cseriesdoc for information about C Series documentation.
Digital In mode is supported only in CompactRIO systems.
Refer to Figure 7 for an illustration of the connections.
Open Contact Mode
In Open Contact mode, the NI 9219E sources a current between the
HI and LO terminals and determines if the two terminals are open
or closed based on the measured current through the terminals.
When the circuit is open, make sure no more than ±60 V is sourced
across the switch. Open Contact mode is supported only in
CompactRIO systems.
Figure 13. Connections in Open Contact Mode
HI
LO
ADC I
NI 9219E
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© National Instruments Corp. 19 NI 9219E Operating Instructions and Specifications
NI 9219E Timing Options
The NI 9219E supports four different timing options that are
optimized for different types of applications by using different
ADC conversion times. High Speed is optimized for high speed at
the expense of noise rejection, Best 60 Hz Rejection is optimized
for rejection of 60 Hz noise, Best 50 Hz Rejection is optimized for
rejection of 50 Hz noise, and High Resolution is optimized for
maximum overall noise rejection and provides rejection of 50 Hz
and 60 Hz noise. Refer to the Specifications section for more
information.
Excitation Protection
The NI 9219E protects the excitation circuit from overcurrent and
overvoltage fault conditions. The module automatically disables
the circuit in the event of a fault condition. Whenever possible,
channels automatically recover after the fault is removed. Refer to
the software help for information on how the software displays and
handles overcurrent and overvoltage faults. Visit ni.com/info
and enter cseriesdoc for information about C Series
documentation.
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