National Instruments NI 9207E Bedienungsanleitung

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.

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

Vsup

AI0+

AI1+

AI2+

AI3+

AI4+

AI5+

AI6+

AI7+

COM

AI8

AI9

AI10

AI11

AI12

AI13

AI14

AI15

Vsup

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

NI 9207E

AI7–

AI7+

AI0+

AI0–

Vsup

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

–

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.

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