National Instruments FieldPoint FP-AI-100 Manual de usuario
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 Vrms CAT II continuous channel-to-ground isolation,
verified by 2,300 Vrms,1 minute dielectric withstand test
• –40 to 70 °C operation
• Hot swappable
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.
FP-AI-100 and cFP-AI-100 2 ni.com
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.
Figure 1. Installing the FP-AI-100
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.
1 I/O Module
2 Terminal Base
3 Alignment Slot
4Key
5 Latch
6 Guide Rails
1
3
2
4
5
6
© National Instruments Corp. 3 FP-AI-100 and cFP-AI-100
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.
Figure 2. Installing the cFP-AI-100
Wiring the [c]FP-AI-100
The FP-TB-xterminal base has connections for each of the eight
input channels and for an optional external supply to power field
devices. The cFP-CB-xconnector 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-xterminal bases and the cFP-CB-xconnector blocks.
1cFP-AI-100
2 Captive Screws
3 cFP Controller Module
4 Screw Holes
5 cFP Backplane
2
2
1
3 5
4
4
FP-AI-100 and cFP-AI-100 4 ni.com
Each channel has separate input terminals for voltage (Vin) and
current (Iin) input. Voltage and current inputs are referenced to the
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.
Table 1. Terminal Assignments
Channel
Terminal Numbers
Vin Iin Vsup COM
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
© National Instruments Corp. 5 FP-AI-100 and cFP-AI-100
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.
Figure 4. Voltage Source without External Power Supply
V
in
V
SUP
COM
I
in
V
C
12-Bit
Isolated ADC
Filter
Filter
V
sup
V
in
VC
To Analog
Input Circuitry
To Next
Channel
1.5 MΩ
Input
Impedance
COM
[c]FP-AI-100
Voltage
Source
+
–
FP-AI-100 and cFP-AI-100 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-100.
Figure 5. Voltage Source with External Power Supply
Measuring Current with the [c]FP-AI-100
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.
Vsup
Vin
VC
To Analog
Input Circuitry
To Next
Channel
1.5 MΩ
Input
Impedance
COM
[c]FP-AI-100
Powered
Voltage
Transducer
OUT
+
–
External
Power
Supply
+
–
© National Instruments Corp. 7 FP-AI-100 and cFP-AI-100
Figure 6 shows how to connect a current source without an external
power supply to one channel of the [c]FP-AI-100.
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-100.
Figure 7. Current Source with External Power Supply
V
sup
I
in
VC
To Analog
Input Circuitry
To Next
Channel
100 Ω
COM
[c]FP-AI-100
Current
Source
Vsup
Iin
VC
To Analog
Input Circuitry
To Next
Channel
100 Ω
COM
[c]FP-AI-100
Loop-Powered
Current
Transducer
External
Power
Supply
+
–
FP-AI-100 and cFP-AI-100 8 ni.com
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.
If a channel is not in use, short the positive input to ground and
configure the channel for a bipolar input range. Small fluctuations
in floating input signals can cause the red Out of Range status
LED on the module to light if the channel is configured for a
unipolar range. Similarly, if a channel is configured for 4–25 mA
input and the input current is 0 mA, the channel is always out of
range.
Overranging
The [c]FP-AI-100 has an overranging feature that measures a little
beyond the nominal values of each range. For example, the actual
measurement limit of the ±5 V range is ±6.0 V. The overranging
feature allows the [c]FP-AI-100 to compensate for field devices
with span errors of up to +20% of full scale. Also, with the
overranging feature, a noisy signal near full scale does not create
rectification errors.
Status Indicators
The [c]FP-AI-100 has two green status LEDs, POWER and
READY. After you insert the [c]FP-AI-100 into a terminal base
or backplane and apply power to the connected network module,
the green POWER indicator lights and the [c]FP-AI-100 informs
the network module of its presence. When the network module
recognizes the [c]FP-AI-100, it sends initial configuration
information to the [c]FP-AI-100. After the [c]FP-AI-100 receives
this initial information, the green READY indicator lights and the
module is in normal operating mode.
In addition to the green POWER and READY indicators, the
[c]FP-AI-100 has one red status LED that lights when the input
signal on any channel is outside the configured range. Refer to the
Input Ranges section for information about selecting input ranges.
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 the
firmware, go to ni.com/info and enter fpmatrix.
© National Instruments Corp. 9 FP-AI-100 and cFP-AI-100
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the [c]FP-AI-100 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-AI-100 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 Installation Category II continuous isolation, verified by
2,300 Vrms, 1 minute dielectric withstand test. The [c]FP-AI-100
provides double insulation (compliant with IEC 61010-1) for
working voltages of 250 Vrms1. Safety standards (such as those
published by UL and IEC) require the use of double insulation
between hazardous voltages and any human-accessible parts or
circuits.
Never try to use any isolation product between human-accessible
parts (such as DIN rails or monitoring stations) and circuits that
can be at hazardous potentials under normal conditions, unless the
product is specifically designed for such an application, as is the
[c]FP-AI-100.
Even though the [c]FP-AI-100 is designed to handle applications
with hazardous potentials, follow these guidelines to ensure a safe
total system:
• There is no isolation between channels on the [c]FP-AI-100.
If a hazardous voltage is present on any channel, all channels
are considered hazardous. Make sure that all other devices and
circuits connected to the module are properly insulated from
human contact.
•Donot share the external supply voltages (the V and C
terminals) with other devices (including other FieldPoint
devices), unless those devices are isolated from human contact.
• For Compact FieldPoint, you must connect the protective earth
(PE) ground terminal on the cFP-BP-xbackplane to the system
safety ground. The backplane PE ground terminal has the
following symbol stamped beside it: . Connect the
1 Working voltage is defined as the signal voltage plus the common-mode voltage.
Common-mode voltage is the voltage of the module with respect to ground.
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