National Instruments FIELDPOINT cFP-AI-118 Operating Instructions Manual
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FIELDPOINT™ OPERATING INSTRUCTIONS
ni.com/manuals
cFP-AI-118
8-Channel, 16-Bit Analog Input Module
These operating instructions describe how to install and use the
cFP-AI-118 analog input module. For information about
configuring and accessing the cFP-AI-118 over a network, refer to
the user manual for the FieldPoint network module you are using.
Features
The cFP-AI-118 is a FieldPoint analog input module with the
following features:
• Eight differential analog voltage input channels
• Eight voltage input ranges: 0–1 V, 0–5 V, 0–10 V, 0–15 V,
1V, 5V, 10 V, and 15 V
• 16-bit resolution
• Simultaneous sampling on all channels
• 10 Hz digital sinc filter configurable per channel
•750 V
withstand test
•250V
verified by 2,300 V
• –40 °C to 70 °C operation
• Hot-swappable
channel-to-channel isolation, verified by 5 s dielectric
rms
CAT II continuous channel-to-ground isolation,
rms
, 5 s dielectric withstand test
rms
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Installing the cFP-AI-118
The cFP-AI-118 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-AI-118 onto a powered backplane does not
disrupt the operation of the FieldPoint bank.
To install the cFP-AI-118, refer to Figure 1 and complete the
2
2
1
3 5
4
4
following steps:
1. Align the captive screws on the cFP-AI-118 with the holes on
the backplane. The alignment keys on the cFP-AI-118 prevent
backward insertion.
2. Press firmly to seat the cFP-AI-118 on the backplane.
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.
1cFP-AI-118
2 Captive Screws
3 cFP Controller Module
Figure 1. Installing the cFP-AI-118
cFP-AI-118 2 ni.com
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4 Screw Holes
5 cFP Backplane
Wiring the cFP-AI-118
The cFP-CB-1 has connections for each of the eight input
channels. Each channel has two input terminals, V and V–.
Table 1 lists the terminal assignments for each channel.
Table 1. Terminal Assignments
Terminal Numbers
Channel
0 1 18
1 3 20
2 5 22
3 7 24
4 9 26
5 11 28
6 13 30
7 15 32
NI does not recommend using the V and C terminals with the
cFP-AI-118.
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.
V+ V–
© National Instruments Corp. 3 cFP-AI-118
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Measuring Voltage with the cFP-AI-118
V+
V–
cFP-AI-118
Voltage
Source
+
–
Amplifier
1 MΩ
Input
Impedance
1
2
Figure 2 shows how to connect a voltage source to one channel of
the cFP-AI-118.
Figure 2. Voltage Source without External Power Supply
Installing the Ferrite on Signal Wires
In order to suppress radiated emissions from the Compact
FieldPoint system, you must install the ferrite shipped with the
cFP-AI-118. Install the ferrite 2–3 in. from the ends of the I/O
signal wires, as shown in Figure 3.
1Ferrite 2cFP-CB-x Connector Block
Figure 3. Installing the Ferrite on Signal Wires
cFP-AI-118 4 ni.com
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Install a tie wrap or other device to secure the ferrite in place, as
shown in Figure 4.
1
2
1Ferrite 2Tie Wrap 3cFP-CB-x Connector Block
Figure 4. Ferrite Installed on Signal Wires and Secured with Tie Wrap
Figures 3 and 4 show signal wires connected to a
Note
3
cFP-CB-x connector block, but the ferrite is required with
any connection method.
Input Ranges
The input ranges for voltage signals are 0 –1 V, 0–5 V, 0–10 V,
0–15 V, 1V, 5V, 10 V, and 15 V. FieldPoint software
shows these input ranges with overranging. To prevent inaccurate
readings, choose an input range such that the signal you are
measuring does not exceed either end of the range.
Measurements on a channel may be invalid for up to two update
periods after you change the input range.
Overranging
The cFP-AI-118 has an overranging feature that measures 5%
beyond the nominal values of each range. For example, the actual
measurement limit of the 15 V range is 15.75 V. The
© National Instruments Corp. 5 cFP-AI-118
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