FieldPoint™ Operating Instructions
FP-AI-112 and cFP-AI-112
16-Channel, 16-Bit Analog Input Modules
These operating instructions describe how to install and use the
FP-AI-112 and cFP-AI-112 analog input modules (referred
to inclusively as the [c]FP-AI-112). For information about
configuring and accessing the [c]FP-AI-112 over a network, refer
to the user manual for the FieldPoint network module you are
using.
Features
The [c]FP-AI-112 is a FieldPoint analog input module with the
following features:
• 16 analog voltage input channels
• Eight voltage input ranges: 0–1 V, 0–5 V, 0–10 V, ±60 mV,
±300 mV, ±1V, ±5V, and ±10 V
• 16-bit resolution
• 50 and 60 Hz filter settings
• 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-112
The FP-AI-112 mounts on a FieldPoint terminal base (FP-TB-x),
which provides operating power to the module. Installing the
FP-AI-112 onto a powered terminal base does not disrupt the
operation of the FieldPoint bank.
To install the FP-AI-112, 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-112).
2. Align the FP-AI-112 alignment slots with the guide rails on the
terminal base.
3. Press firmly to seat the FP-AI-112 on the terminal base. When
the FP-AI-112 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-112
2
Installing the cFP-AI-112
The cFP-AI-112 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-AI-112 onto a powered backplane does not
disrupt the operation of the FieldPoint bank.
To install the cFP-AI-112, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-AI-112 with the holes on
the backplane. The alignment keys on the cFP-AI-112 prevent
backward insertion.
2. Press firmly to seat the cFP-AI-112 on the backplane.
FP-AI-112 and cFP-AI-112 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
1
1cFP-AI-112
2 Captive Screws
3 cFP Controller Module
Figure 2. Installing the cFP-AI-112
4 Screw Holes
5 cFP Backplane
Wiring the [c]FP-AI-112
4
4
The FP-TB-x terminal base has connections for each of the
16 input channels and for an optional external power supply to
power field devices. The cFP-CB-x connector block provides the
same connections. Each channel has one input terminal (V
IN
) for
voltage input. All 16 inputs are referenced to the COM terminals,
which are internally connected to each other and to the C terminals.
The channels share eight V
terminals, all of which are internally
SUP
connected to each other and to the V terminals.
© National Instruments Corp. 3 FP-AI-112 and cFP-AI-112
You can use an external power supply to power field devices.
Connect the positive lead of the external power supply to both
V terminals and the negative lead to both C terminals. Ensure that
the current through both V terminals can never exceed 2 A.
Install 2 A maximum, fast-acting fuses between the external power
supply and the V terminals. The wiring diagrams in this document
show fuses where appropriate.
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.
Table 1. Terminal Assignments
Terminal Numbers
Channel
0 1 17 18
1 2 17 18
2 3 19 20
3 4 19 20
4 5 21 22
5 6 21 22
6 7 23 24
7 8 23 24
8 9 25 26
9 10 25 26
10 11 27 28
11 12 27 28
12 13 29 30
13 14 29 30
14 15 31 32
15 16 31 32
V
IN
V
SUP
COM
FP-AI-112 and cFP-AI-112 4 ni.com
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.
Measuring Voltage with the [c]FP-AI-112
Figure 3 shows how to connect a voltage source without an
external power supply to one channel of the [c]FP-AI-112.
VC
Voltage
Source
V
SUP
V
IN
+
–
COM
Input
Circuitry
>100 MΩ
Input
Impedance
[c]FP-AI-112
Figure 3. Voltage Source without External Power Supply
Figure 4 shows how to connect a voltage source with an external
power supply to one channel of the [c]FP-AI-112.
Powered
Voltage
Transducer
+
OUT
–
V
SUP
V
COM
External
Power Supply
(Optional)
IN
>100 MΩ
Input
Impedance
Input
Circuitry
+
–
2 A
Max
VC
[c]FP-AI-112
Figure 4. Voltage Source with External Power Supply
© National Instruments Corp. 5 FP-AI-112 and cFP-AI-112
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