National Instruments FieldPoint FP-AI-110 Manual de usuario
National Instruments FP-AI-110 Manual
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FieldPoint™Operating Instructions
FP-AI-110 and cFP-AI-110
Eight-Channel, 16-Bit Analog Input Modules
These operating instructions describe how to install and use the
FP-AI-110 and cFP-AI-110 analog input modules (referred to
inclusively as the [c]FP-AI-110). For information about
configuring and accessing the [c]FP-AI-110 over a network, refer
to the user manual for the FieldPoint network module you are
using.
Features
The [c]FP-AI-110 is a FieldPoint analog input module with the
following features:
• Eight analog voltage or current input channels
• Eight voltage input ranges: 0–1 V, 0–5 V, 0–10 V, ±60 mV,
±300 mV, ±1V,±5V,and±10 V
• Three current input ranges: 0–20, 4–20, and ±20 mA
• 16-bit resolution
• Three filter settings: 50, 60, and 500 Hz
• 250 Vrms CAT II continuous channel-to-ground isolation,
verified by 2,300 Vrms dielectric withstand test
• –40 to 70 °C operation
• Hot swappable
Installing the FP-AI-110
The FP-AI-110 mounts on a FieldPoint terminal base (FP-TB-x),
which provides operating power to the module. Installing the
FP-AI-110 onto a powered terminal base does not disrupt the
operation of the FieldPoint bank.
FP-AI-110 and cFP-AI-110 2 ni.com
To install the FP-AI-110, 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-110).
2. Align the FP-AI-110 alignment slots with the guide rails on the
terminal base.
3. Press firmly to seat the FP-AI-110 on the terminal base. When
the FP-AI-110 is firmly seated, the latch on the terminal base
locks it into place.
Figure 1. Installing the FP-AI-110
Installing the cFP-AI-110
The cFP-AI-110 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-AI-110 onto a powered backplane does not
disrupt the operation of the FieldPoint bank.
To install the cFP-AI-110, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-AI-110 with the holes on
the backplane. The alignment keys on the cFP-AI-110 prevent
backward insertion.
2. Press firmly to seat the cFP-AI-110 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
1 I/O Module
2 Terminal Base
3 Alignment Slot
4Key
5Latch
6 Guide Rails
1
3
2
4
5
6
© National Instruments Corp. 3 FP-AI-110 and cFP-AI-110
(10 lb ⋅in.) of torque. The nylon coating on the screws prevents
them from loosening.
Figure 2. Installing the cFP-AI-110
Wiring the [c]FP-AI-110
The FP-TB-xterminal base has connections for each of the eight
input channels and for an external power supply to power field
devices. The cFP-CB-xconnector block provides the same
connections. Each channel has separate input terminals for voltage
(VIN) and current (IIN) input. Voltage and current inputs are
referenced to the COM terminals, which are internally connected
to each other and to the C terminals. All eight VSUP terminals are
internally connected to each other and to the V terminals.
You can use a 10–30 VDC external supply to power field devices.
Connect the external power supply to multiple V and VSUP
terminals so that the maximum current through any V terminal
1cFP-DI-300
2CaptiveScrews
3 cFP Controller Module
4 Screw Holes
5cFPBackplane
2
2
1
3 5
4
4
FP-AI-110 and cFP-AI-110 4 ni.com
is 2 A or less and the maximum current through any VSUP terminal
is 1 A or less.
Install a 2 A maximum, fast-acting fuse between the external
power supply and the V terminal on each channel. 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-xterminal bases and the cFP-CB-xconnector blocks.
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.
Table 1. Terminal Assignments
Channel
Terminal Numbers
VIN1IIN2VSUP3COM
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
511 12 27 28
613 14 29 30
715 16 31 32
1 Install a 2 A, fast-acting fuse on each VIN terminal.
2 Install a 2 A, fast-acting fuse on each IIN terminal.
3Install a 2 A maximum, fast-acting fuse on each VSUP terminal.
© National Instruments Corp. 5 FP-AI-110 and cFP-AI-110
Taking Measurements
with the [c]FP-AI-110
The [c]FP-AI-110 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.
Figure 3. FP-AI-110 Analog Input Circuit
Measuring Voltage with the [c]FP-AI-110
The input ranges for voltage signals are 0–1 V, 0–5 V, 0–10 V,
±60 mV, ±300 mV, ±1V,±5 V, and ±10 V.
Figure 4 shows how to connect a voltage source without an
external power supply to one channel of the [c]FP-AI-110.
Figure 4. Voltage Source without External Power Supply
VIN
VSUP
COM
IIN
V
C
16-Bit
Isolated ADC
Filter
Filter
VSUP
VIN
VC
To Analog
Input Circuitry
To Next Channel
>100 MΩ
Input
Impedance
COM
[c]FP-AI-110
Voltage
Source
+
–
IIN
FP-AI-110 and cFP-AI-110 6 ni.com
Figure 5 shows how to connect a voltage source with an external
power supply to one channel of the [c]FP-AI-110.
Figure 5. Voltage Source with External Power Supply
Measuring Current with the [c]FP-AI-110
The input ranges for current sources are 0–20, 4–20, and ±20 mA.
The module reads current flowing into the IIN terminal as positive
and current flowing out of the terminal as negative. Current flows
into the IIN terminal, goes through a 100 Ωresistor, and flows out
from the COM or C terminal.
Figure 6 shows how to connect a current source without an external
power supply to one channel of the [c]FP-AI-110.
VSUP
VIN
VC
To Analog
Input Circuitry
To Next Channel
COM
[c]FP-AI-110
IIN
Powered
Voltage
Transducer
OUT
+
–
+
–
10–30 VDC
External
Power Supply
(Optional)
2 A
Max
1 A
Max
© National Instruments Corp. 7 FP-AI-110 and cFP-AI-110
Figure 6. Current Source without External Power Supply
Figure 7 shows how to connect a current source with an external
power supply to one channel of the [c]FP-AI-110.
Figure 7. Current Source with External Power Supply
Input Ranges
To prevent inaccurate readings, choose an input range such that the
signal you are measuring does not exceed either end of the range.
VSUP
VIN
VC
To Analog
Input Circuitry
To Next Channel
COM
[c]FP-AI-110
IIN
Current
Source
1 A
Max
VSUP
VIN
VC
To Analog
Input Circuitry
To Next Channel
COM
[c]FP-AI-110
IIN
+
–
Loop-Powered
Current
Transducer
10–30 VDC
External
Power Supply
(Optional)
1 A
Max
2 A
Max
FP-AI-110 and cFP-AI-110 8 ni.com
Overranging
The [c]FP-AI-110 has an overranging feature that measures a little
beyond the nominal values of each range. For example, the actual
measurement limit of the ±10 V range is ±10.4 V. The overranging
feature enables the [c]FP-AI-110 to compensate for field devices
with span errors of up to +4% of full scale. Also, with the
overranging feature, a noisy signal near full scale does not create
rectification errors.
Filter Settings
Three filter settings are available for each channel. The filters on
the [c]FP-AI-110 input channels are comb filters that provide
notches of rejection at multiples, or harmonics, of a fundamental
frequency. You can select a fundamental frequency of 50, 60, or
500 Hz. The [c]FP-AI-110 applies 95 dB of rejection at the
fundamental frequency and at least 60 dB of rejection at each of
the harmonics. In many cases, most of the noise components of
input signals are related to the local AC power line frequency, so
a filter setting of either 50 or 60 Hz is best.
The filter setting determines the rate at which the [c]FP-AI-110
samples the inputs. The [c]FP-AI-110 resamples all of the channels
at the same rate. If you set all of the channels to the 50 or 60 Hz
filter, the [c]FP-AI-110 samples each channel every 1.470 s or
every 1.230 s, respectively. If you set all of the channels to 500 Hz
filters, the module samples each channel every 0.173 s. When you
select different filter settings for different channels, use the
following formula to determine the sampling rate.
(number of channels with 50 Hz filter) ×184 ms +
(number of channels with 60 Hz filter) ×154 ms +
(number of channels with 500 Hz filter) ×21.6 ms =
Update Rate
If you are not using some of the [c]FP-AI-110 channels, set them
to the 500 Hz filter setting to improve the response time of the
module. For example, if one channel is set for a 60 Hz filter, and
the other seven channels are set to 500 Hz, the module samples
each channel every 0.3 s (four times faster than the case in which
all eight channels are set to the 60 Hz setting).
The sampling rate does not affect the rate at which the network
module reads the data. The [c]FP-AI-110 always has data available
for the network module to read; the sampling rate is the rate at
which this data is updated. Set up your application so that the
© National Instruments Corp. 9 FP-AI-110 and cFP-AI-110
sampling rate is faster than the rate at which the network module
polls the [c]FP-AI-110 for data.
Status Indicators
The [c]FP-AI-110 has two green status LEDs, POWER and
READY. After you insert the [c]FP-AI-110 into a terminal base or
backplane and apply power to the connected network module, the
green POWER LED lights and the [c]FP-AI-110 informs the
network module of its presence. When the network module
recognizes the [c]FP-AI-110, it sends initial configuration
information to the [c]FP-AI-110. After the [c]FP-AI-110 receives
this initial information, the green READY LED lights and the
module is in normal operating mode. A blinking or unlit READY
LED indicates an error condition.
Upgrading the FieldPoint Firmware
You may need to upgrade the FieldPoint firmware when you add
new I/O modules to the FieldPoint system. For information on
determining which firmware you need and how to upgrade your
firmware, go to ni.com/info and enter fpmatrix.
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the [c]FP-AI-110 to any circuits
that may contain hazardous voltages.1
This section describes the isolation of the [c]FP-AI-110 and
its compliance with international safety standards. The field
wiring connections are isolated from the backplane and the
inter-module communication bus. The isolation barriers in the
module provide 250 Vrms Measurement Category II continuous
channel-to-backplane and channel-to-ground isolation, verified by
2,300 Vrms, 5 s dielectric withstand test.2The [c]FP-AI-110
provides double insulation (compliant with IEC 61010-1) for
1 A hazardous voltage is a voltage greater than 42.4 Vpeak or 60 VDC. When a
hazardous voltage is present on any channel, all of the channels must be considered
to be carrying hazardous voltages. Ensure that all circuits connected to the module
are inaccessible to human touch.
2 Refer to the Safety Isolation Voltage section for more information about isolation on
the [c]FP-AI-110.
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