National Instruments NI 9253 User manual

GETTING STARTED GUIDE
NI 9253
8 AI, ±20 mA, 24 bit, 50 kS/s/ch Simultaneous

This document explains how to connect to the NI 9253.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9253. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
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NI 9253 Pinout
AI0
AI1
AI2
AI3
AI4
AI5
AI6
AI7
COM
COM
Vsup
NC
NC
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
COM
Vsup
Vsup Vsup
Vsup Vsup
Vsup Vsup
Vsup
COM COM
COM COM
COM COM
NI 9253 Getting Started Guide | © National Instruments | 3

Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
Vsup Voltage supply connection
COM Common reference connection to isolated ground
NC No connection
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NI 9253 LEDs
Status Color Indication
ON Green • Channel is operational with input limits
detection enabled
• Vsup is in range if field side power fault
detection is enabled
Red • Channel is in fault condition1
• Vsup is in range if field side power fault
detection is enabled
1The channel is in the over-current state and/or the data has exceeded user-
defined input limits.
NI 9253 Getting Started Guide | © National Instruments | 5

Status Color Indication
OFF None • Channel is operational without input
limits detection enabled
• Vsup is in range if field side power
detection is enabled
• Master timebase is absent
Flashing Green • Channel is operational
• Vsup is out of range if field side power
detection is enabled
Red • Channel is in fault condition1
• Vsup is out of range if field side power
detection is enabled
Alternating
flashing rows
Green • Module is powered on
• First acquisition is not initiated
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Connecting an External Power Supply
You can connect an external power supply to the NI 9253. 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.
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.
Attention Ne retirez ou n'insérez pas de modules si
l'alimentation externe connectée aux broches Vsup et
COM est sous tension.
NI 9253 Getting Started Guide | © National Instruments | 7

Connecting a Loop-Powered Current
Transducer
NI 9253
+
–
AI0
External
Power
Supply
Loop-Powered
Current
Transducer
Vsup
COM
Vsup
2 A
Max
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Connecting a Three-Wire Current
Transducer
NI 9253
Vsup
COM
+
–
COM
Vsup
AI0
External
Power
Supply
Three-Wire
Current
Transducer
2 A
Max
OUT
+
–
NI 9253 Getting Started Guide | © National Instruments | 9

NI 9253 Connection Guidelines
• Make sure that devices you connect to the NI 9253 are
compatible with the module specifications.
• You must use 2-wire ferrules to create a secure connection
when connecting more than one wire to a single terminal on
the NI 9253 with spring terminal.
• Push the wire into the terminal when using a solid wire or a
stranded wire with a ferrule.
• Open the terminal by pressing the push button when using
stranded wire without a ferrule.
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends
that you use the NI 9963 backshell kit to protect connections to
the NI 9253 with spring terminal.
10 | ni.com | NI 9253 Getting Started Guide