National Instruments NI 9207E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9207E
16-Channel, ±20 mA/±10 V, 24-Bit Analog Input
Module

NI 9207E Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9207E
and includes dimensions, pin assignments, and specifications for the
NI 9207E. 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 9207E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9207E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.

© National Instruments Corp. 3 NI 9207E Operating Instructions and Specifications
NI 9207E Dimensions
The following figure shows the dimensions of the NI 9207E.
Figure 1. NI 9207E Dimensions in Millimeters (Inches)
73.4 (2.89)
0.0 (0.00)
26.7 (1.05)
58.4 (2.30)
66.0 (2.60)
0.0 (0.00)

NI 9207E Operating Instructions and Specifications 4 ni.com
Connecting the NI 9207E
The NI 9207E has a 37-pin DSUB connector that provides
connections for 16 analog input channels: 8 voltage and 8 current.
Figure 2. NI 9207E Pin Assignments
AI0–
AI1–
AI2–
AI3–
AI4–
AI5–
AI6–
AI7–
COM
COM
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
AI0+
AI1+
AI2+
AI3+
AI4+
AI5+
AI6+
AI7+
COM
COM
AI8
AI9
AI10
AI11
AI12
AI13
AI14
AI15
Vsup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

© National Instruments Corp. 5 NI 9207E Operating Instructions and Specifications
Each voltage channel has an AI+ pin and an AI– pin to which you
can connect a voltage signal. Each current channel has an AI pin to
which you can connect a current signal. The NI 9207E also has
nine Vsup pins, one for connecting an external power supply, and
one for each current channel. There are also four common pins,
COM, that are internally connected to the isolated ground
reference of the module.
The input signals are scanned, amplified, conditioned, and then
sampled by a single 24-bit ADC. The module provides overvoltage
protection for each channel. Only one channel can be in an
overvoltage condition at a time. Refer to the Specifications section
for information about overvoltage protection. Refer to Figure 3 for
an illustration of the input circuitry on the NI 9207E.

NI 9207E Operating Instructions and Specifications 6 ni.com
Figure 3. Input Circuitry on the NI 9207E
MUX
Amplifier
Instrumentation
Amplifier
+
–
COM
AI15
AI8
Isolated
ADC
MUX
MUX
NI 9207E
AI7–
AI7+
AI0+
AI0–
Vsup
Vsup

© National Instruments Corp. 7 NI 9207E Operating Instructions and Specifications
Connecting Voltage Channels
You can connect differential or single-ended voltage signals to the
NI 9207E voltage channels.
Connecting Differential Voltage Signals to the NI 9207E
You can connect grounded or floating differential signals to the
NI 9207E voltage channels. Connect the positive voltage signal to
AI+ and the negative voltage signal to AI–. To connect grounded
differential signals to the NI 9207E, you must also connect the
signal reference to COM, as shown in Figure 4.
Figure 4. Connecting a Grounded Differential Voltage Signal to the NI 9207E
Voltage
Source
+
–
AI0+
AI0–
COM
NI 9207E

NI 9207E Operating Instructions and Specifications 8 ni.com
To connect floating differential signals to the NI 9207E, you must
connect the negative lead of the signal to COM through a 1 MΩ
resistor to keep the voltage source within the common-mode
voltage range, as shown in Figure 5. If the voltage source is outside
of the common-mode range, then the NI 9207E does not read data
accurately. For more information about the common-mode voltage
range, refer to the Specifications section.
Figure 5. Connecting a Floating Differential Voltage Signal to the NI 9207E
1 MΩ
Resistor
NI 9207E
AI0+
AI0–
COM
Voltage
Source
+
–

© National Instruments Corp. 9 NI 9207E Operating Instructions and Specifications
Connecting Single-Ended Voltage Signals to the NI 9207E
To connect single-ended voltage signals to the NI 9207E, you
must also connect the voltage ground signal to COM to keep
the common-mode voltage in the specified range, as shown in
Figure 6. For more information about the common-mode voltage
range, refer to the Specifications section.
Figure 6. Connecting a Single-Ended Voltage Signal to the NI 9207E
+
–
AI0+
AI0–
COM
Voltage
Source
NI 9207E

NI 9207E Operating Instructions and Specifications 10 ni.com
Connecting Current Channels
You can connect an external power supply to the NI 9207E. This
power supply provides the current for the devices you connect to
the module. Connect the positive lead of the power supply to a
Vsup pin and the negative lead of the power supply to COM. Install
a 2 A maximum, fast-acting fuse between the external power
supply and the Vsup pin. Refer to the Specifications sections for
more information about the Vsup pins.
Note The Vsup pins are internally connected to each
other. You can connect only one external voltage supply
to the device.
Caution Do not remove or insert modules if the external
power supply connected to the Vsup and COM pins is
powered on.
You can connect single-ended current signals to the NI 9207E,
including loop-powered and three-wire current transducers.
Connect the output of the current signal to the AI pin of the channel
and the voltage supply of the current signal to Vsup. For a
three-wire transducer, also connect the common of the device to
COM. Refer to Figures 7 and 8 for illustrations of how to connect
loop-powered and three-wire current transducers to the NI 9207E.