National Instruments FieldPoint FP-AI-100, FieldPoint cFP-AI-100 Operating Instructions Manual

National Instruments FP-AI-100 Manual

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FieldPoint™ Operating Instructions

FP-AI-100 and cFP-AI-100

Eight-Channel, 12-Bit Analog Input Modules

These operating instructions describe how to install and use the
FP-AI-100 and cFP-AI-100 analog input modules (referred to
inclusively as the [c]FP-AI-100). For information about
configuring and accessing the [c]FP-AI-100 over a network,
refer to the user manual for the FieldPoint network module you are
using.

Features

The [c]FP-AI-100 is a FieldPoint analog input module with the
following features:

• Eight analog voltage or current input channels

• 11 input ranges: 0–1 V, 0–5 V, 0–15 V, 0–30 V, ±1 V, ±5 V,
±15 V, ±30 V, 0–20 mA, 4–20 mA, and ±20 mA

• 12-bit resolution

• 250 V
verified by 2,300 V

• –40 to 70 °C operation

• Hot swappable

CAT II continuous channel-to-ground isolation,

rms

,1 minute dielectric withstand test

rms

Installing the FP-AI-100

The FP-AI-100 mounts on a FieldPoint terminal base (FP-TB-x),
which provides operating power to the module. Installing the
FP-AI-100 onto a powered terminal base does not disrupt the
operation of the FieldPoint bank.

To install the FP-AI-100, refer to Figure 1 and complete the
following steps:

1. Slide the terminal base key to either position X (used for any
module) or position 1 (used for the FP-AI-100).

2. Align the FP-AI-100 alignment slots with the guide rails on the
terminal base.

3. Press firmly to seat the FP-AI-100 on the terminal base. When
the FP-AI-100 is firmly seated, the latch on the terminal base
locks it into place.

4

5

3

6

1 I/O Module
2 Terminal Base
3 Alignment Slot

1

4Key
5 Latch
6 Guide Rails

Figure 1. Installing the FP-AI-100

2

Installing the cFP-AI-100

The cFP-AI-100 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-AI-100 onto a powered backplane does not
disrupt the operation of the FieldPoint bank.

To install the cFP-AI-100, refer to Figure 2 and complete the
following steps:

1. Align the captive screws on the cFP-AI-100 with the holes on
the backplane. The alignment keys on the cFP-AI-100 prevent
backward insertion.

2. Press firmly to seat the cFP-AI-100 on the backplane.

FP-AI-100 and cFP-AI-100 2 ni.com

3. Using a number 2 Phillips screwdriver with a shank of at least
64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅ m
(10 lb ⋅ in.) of torque. The nylon coating on the screws prevents
them from loosening.

3 5

2

2

4

4

1

1cFP-AI-100
2 Captive Screws
3 cFP Controller Module

Figure 2. Installing the cFP-AI-100

4 Screw Holes
5 cFP Backplane

Wiring the [c]FP-AI-100

The FP-TB-x terminal base has connections for each of the eight
input channels and for an optional external supply to power field
devices. The cFP-CB-x connector block provides the same
connections.

Table 1 lists the terminal assignments for the signals associated
with each channel. The terminal assignments are the same for the
FP-TB-x terminal bases and the cFP-CB-x connector blocks.

© National Instruments Corp. 3 FP-AI-100 and cFP-AI-100

Table 1. Terminal Assignments

Terminal Numbers

Channel

0 1 2 17 18

1 3 4 19 20

2 5 6 21 22

3 7 8 23 24

4 9 10 25 26

5 11 12 27 28

6 13 14 29 30

7 15 16 31 32

V

in

I

in

V

sup

COM

Each channel has separate input terminals for voltage (Vin) and
current (I

) input. Voltage and current inputs are referenced to the

in

COM terminals. If you are using an external supply to power field
devices, connect the power supply to the V and C terminals of the
terminal base or connector block. Refer to the sections that follow
for detailed wiring diagrams.

Caution Do not connect both current and voltage inputs

to the same channel.

Caution Cascading power between two modules defeats

isolation between those modules. Cascading power from
the network module defeats all isolation between
modules in the FieldPoint bank.

Taking Measurements
with the [c]FP-AI-100

The [c]FP-AI-100 has eight single-ended input channels. All eight
channels share a common ground reference that is isolated from
other modules in the FieldPoint system. Figure 3 shows the analog
input circuitry on one channel.

FP-AI-100 and cFP-AI-100 4 ni.com

V

V

SUP

V

in

Filter

12-Bit

Isolated ADC

I

in

Filter

COM

C

Figure 3. [c]FP-AI-100 Analog Input Circuit, One Channel

Measuring Voltage with the [c]FP-AI-100

The input ranges for voltage signals are 0–1 V, 0–5 V, 0–15 V,
0–30 V, ±1 V, ±5 V, ±15 V, and ±30 V.

Figure 4 shows how to connect a voltage source without an
external power supply to one channel of the [c]FP-AI-100.

VC

To Next

Channel

Voltage

Source

+

–

V

sup

V

COM

[c]FP-AI-100

in

1.5 MΩ
Input
Impedance

To Analog

Input Circuitry

Figure 4. Voltage Source without External Power Supply

© National Instruments Corp. 5 FP-AI-100 and cFP-AI-100