FieldPoint FP-AI-100 User manual

FieldPoint ™is a trademark of National Instruments Corporation. Product and company names
mentioned herein are trademarks or trade names of their respective companies.
321903C-01 ©Copyright 1998, 1999 National Instruments Corp. All rights reserved. June 1999
OPERATING INSTRUCTIONS
FP-AI-100
8-Channel, 12-Bit Analog Input Module
These operating instructions describe the installation, features, and
characteristics of the FP-AI-100. For more information about
configuring and accessing the FP-AI-100 over a network, refer to
the user manual for the particular FieldPoint network module you
are using with the FP-AI-100.
Features
The FP-AI-100 is a FieldPoint analog input module with the
following features:
• Eight analog voltage or current input channels
• 11 input ranges: ±15 V, ±5 V, ±1 V, 0–15 V, 0–5 V, 0–1 V,
±20 mA, 0–20 mA, 4–20 mA, 0–30 V, ±30 V
• 12-bit resolution
• Hot plug and play operation
• 2,500 Vrms input-to-output isolation
• Double insulated for 250 V safe working voltage
• –40 to +70 °C operation
Installation
The FP-AI-100 mounts on a FieldPoint terminal base (FP-TB-xx)
unit. Because of its hot plug and play operation, you can install the
FP-AI-100 onto a powered terminal base without disturbing the
operation of other modules or terminal bases. The FP-AI-100
receives operating power from the terminal base.

FP-AI-100 2 www.natinst.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 module).
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 module is firmly seated, the terminalbase latch locks it into
place.
Figure 1. Install Your Module
Field Wiring
The terminal base provides connections for each input channel and
an external supply to power field devices. Each channel has one
input terminal for voltage (Vin) or current (Iin) inputs. Both voltage
andcurrent inputs arereferencedto theCOM terminals.Toconnect
an external supply to power field devices, connect to the V and
C terminals of the terminal base. If you use an external supply, the
field devices source this power from the Vsup and COM terminals
of each channel. Figure 2 shows two examples of basic wiring
connections, both with and without the use of an external supply.
Alignment
Slot
Key
Latch
Guide Rails
Terminal BaseI/O Module

© National Instruments Corp. 3 FP-AI-100
Figure 2. Basic Field Connections (Two Channels Shown)
Table 1 lists the terminal assignments for the signals of each
channel. Terminal assignments and wiring diagrams are also listed
under the slide-in card on the front of the FP-AI-100 module.
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
External
Power
Supply
+
–
Loop
Powered
Current
Transmitter
Powered
Voltage
Transmitter
VC
Vsup
Iin
Vsup
Vin +
–+
–
OUT
COM
a. With an External Supply to
Power Field Devices
Current
Source
Voltage
Source
Iin
COM
Vin
COM
b. With Signal Sources Not
Requiring Supply Connections

FP-AI-100 4 www.natinst.com
Analog Input Circuit
The FP-AI-100 has eight isolated single-ended input channels. You
can connect each channel to either a voltage signal or a current
signal. All eight input channels are referenced toa single common,
provided by the COM terminals of each channel and by the
C terminals of the terminal base. Because the entire FP-AI-100
input section is electrically isolated, this common reference
is floating; it is not internally referenced to ground or to signals
on any other FieldPoint module. This type of input is
pseudo-differential.
Figure 3 shows a diagram of the input circuit of one single channel.
Figure 3. Analog Input Circuit
Voltage Inputs
Connect positive voltage inputs to the Vin terminal and connect
negative voltage inputs to the COM terminal. The input ranges for
voltage signals are ±15 V, ±5 V, ±1 V, 0–15 V, 0–5 V, 0–1 V,
0–30 V, and ±30 V.
Current Inputs
Connectcurrentinputs to the Iin terminalsandreferencethem tothe
COM or C terminals.The FP-AI-100 reads current flowing into the
Iin terminal as positive and current flowing out of the terminal as
negative. Current flows from the Iin terminal, through a 100 Ω
resistor, and out the COM or C terminals. Figure 2 shows two
examples of how to connect current sources. The input ranges for
current sources are ±20 mA, 0–20 mA, and 4–20 mA.
Vin
Vsup
COM
Iin
Filter
Filter
V
C
12-Bit
Isolated ADC

© National Instruments Corp. 5 FP-AI-100
Input Ranges
To prevent inaccurate readings, make sure that the signal you are
measuring does not exceed either end of the input range that you
select.
The FP-AI-100 has an over-ranging feature, which measures a
little beyond the nominal values of each range. For example, the
actual measurement limits of the ±5 V range are ±6.0 V. This
over-ranging feature allows the FP-AI-100 to compensate for field
devices with span errors of up to +20%. Also, with the
over-ranging feature, a noisy signal near full scale does not create
rectification errors.
Status Indicators
Figure 4 shows the module label and status indicators. To see
wiring diagrams for the input channels, remove the slide-in card.
Figure 4. Status Indicators
After you insert the moduleinto a terminalbase (and apply power),
the green POWER indicator lights and the FP-AI-100 informs the
network module of its presence. When the network module
recognizes the FP-AI-100, it sends initial configuration
information to the FP-AI-100. After receiving this initial
information, the green READY indicator lights and the FP-AI-100
is in its normal operating mode.

FP-AI-100 6 www.natinst.com
Isolation and Safety Guidelines
Caution Before you connect any circuits that may
contain hazardous voltages to the FP-AI-100, read the
following information.
This section describes the isolation of the FP-AI-100 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane provided by the
terminal base with an optical and galvanic isolation barrier
designed and tested to provide protection against fault voltages of
up to 2,500 Vrms. In addition, the FP-AI-100 provides double
insulation (compliant with IEC 1010-1) for working
common-mode voltages of 250 Vrms. 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
may be at hazardous potentials under normal conditions, unless the
product is specifically designed for such an application, as is the
FP-AI-100.
When you use a product like the FP-AI-100 in applications with
hazardous potentials, follow these guidelines to make sure your
total system is safe:
• The safety isolation of the FP-AI-100 is from input to output,
not between channels on the same module. If any of the
channels on a module are wired at a hazardous potential, make
sure that all other devices or circuits connected to that module
are properly insulated from human contact.
•Donot share the external supply voltages (V and C on the
terminal base) with other devices (including other FieldPoint
devices), unless those devices are isolated from human contact.
• As with any hazardous voltage wiring, make sure that all
wiring and connections meet applicable electrical codes and
common sense practices. Mount terminal bases in an area,
position, or cabinet that prevents accidental or unauthorized
access to wiring that carries hazardous voltages.
• The isolation of the FP-AI-100 is certified as double-insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-AI-100as the only isolating barrierbetween humancontact
and working voltages of more than 250 Vrms.

© National Instruments Corp. 7 FP-AI-100
Specifications
The following specifications are typical for a range of
–40 to +70 °C, unless otherwise noted.
Input
Number of channels..........................8
ADC resolution.................................12 bits
Type of ADC.....................................successive approximation
Isolation ............................................2,500 Vrms
Safety isolation, working voltage .....250 Vrms, designed per IEC
1010 as double insulated
Update rate (all channels).................360 S/s (2.8 ms)
Voltage Inputs
The following input signal ranges are software-selectable per
channel.
Voltage
Input
Range Effective
Resolution*
Typical
Offset Error at
+15°to +35° C
Maximum
Offset Error at
–40°to +70° C
0–1 V
0–5 V
0–15 V
0–30 V
± 1 V
± 5 V
± 15 V
± 30 V
1.5 mV
5 mV
15 mV
25 mV
1.5 mV
5 mV
25 mV
40 mV
1.1 mV ± 1 LSB
4 mV ± 1 LSB
10 mV ± 1 LSB
20 mV ± 1 LSB
1.7 mV ± 1 LSB
7 mV ± 1 LSB
20 mV ± 1 LSB
40 mV ± 1 LSB
15 mV ± 1 LSB
25 mV ± 1 LSB
40 mV ± 1 LSB
60 mV ± 1 LSB
20 mV ± 1 LSB
35 mV ± 1 LSB
80 mV ± 1 LSB
140 mV ± 1 LSB
* Effective resolution includes quantization errors and rms noise.

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Input impedance................................1.5 MΩ
Overvoltage protection .....................250 Vrms
Input noise ........................................2 mV + 1 LSB pk-pk
Signal input bandwidth.....................170 Hz
Current Inputs
The following input signal ranges are software-selectable per
channel.
Input impedance................................100 Ω
Overcurrent protection......................± 30 mA
Input noise ........................................20 µA + 1 LSB pk-pk
Signal input bandwidth.....................160 Hz
Voltage
Input
Range With
Over-Ranging
Typical
Gain Error at
+15 to +35 °C
Maximum
Gain Error at
–40 to +70 °C
0–1 V
0–5 V
0–15 V
0–30 V
± 1 V
± 5 V
± 15 V
± 30 V
0–1.2 V
0–6 V
0–18 V
0–36 V
± 1.2 V
± 6 V
± 18 V
± 36 V
0.09%
0.09%
0.12%
0.22%
0.08%
0.08%
0.11%
0.20%
0.50%
0.50%
0.55%
0.53%
0.50%
0.53%
0.57%
0.54%
Current
Input
Range Effective
Resolution*
Typical
Offset Error at
+15 to +35 °C
Maximum
Offset Error at
–40 to +70 °C
0–20 mA
4–20 mA
± 20 mA
15 µΑ
15 µΑ
20 µΑ
12 µΑ ± 1 LSB
12 µΑ ± 1 LSB
27 µΑ ± 1 LSB
40 µΑ ± 1 LSB
40 µΑ ± 1 LSB
100 µΑ ± 1 LSB
* Effective resolution includes quantization errors and rms noise.
Current
Input
Range With
Over-Ranging
Typical
Gain Error at
+15 to +35 °C
Maximum
Gain Error at
–40 to +70 °C
0–20 mA
4–20 mA
± 20 mA
0–24 mA
3.5–24 mA
± 24 mA
0.09%
0.09%
0.06%
0.51%
0.51%
0.545%

© National Instruments Corp. 9 FP-AI-100
Physical
Indicators ..........................................Green POWER and
READY indicators
Weight...............................................145 g (5.1 oz)
Power Requirements
Power from network module ............400 mW
Environment
Operating temperature......................–40 to +70 °C
Storage temperature..........................–55 to +85 °C
Relative humidity..............................5% to 90%, non-condensing
CE Mark Compliance
This product meets applicable EU directive(s), as follows:
Safety isolation .................................EN 61010 (double insulation
for 250 Vrms working
isolation, installation
category II)
EMC directive
Immunity....................................EN 50082-1:1994
Emissions ...................................EN 55011:1991 Group I
Class A at 10 m
Mechanical Dimensions
Figure 5 shows the mechanical dimensions of the FP-AI-100
installed on a terminal base. Dimensions are given in inches
[millimeters].
Figure 5. Mechanical Dimensions
4.31
[109.5]
3.60 [91.44]
4.22 [107.19]