National Instruments FIELDPOINT cFP-AI-118 User manual

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FIELDPOINT™OPERATING INSTRUCTIONS
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
•750V
rms channel-to-channel isolation, verified by 5 s dielectric
withstand test
•250V
rms CAT II continuous channel-to-ground isolation,
verified by 2,300 Vrms , 5 s dielectric withstand test
• –40 °C to 70 °C operation
• Hot-swappable
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.
ni.com/manuals
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cFP-AI-118 2 ni.com
To install the cFP-AI-118, refer to Figure 1 and complete the
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.
Figure 1. Installing the cFP-AI-118
1cFP-AI-118
2 Captive Screws
3 cFP Controller Module
4 Screw Holes
5 cFP Backplane
2
2
1
35
4
4
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© National Instruments Corp. 3 cFP-AI-118
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.
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.
Table 1. Terminal Assignments
Channel
Terminal Numbers
V+ V–
0 1 18
1 3 20
2 5 22
3 7 24
4 9 26
511 28
613 30
715 32
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cFP-AI-118 4 ni.com
Measuring Voltage with the cFP-AI-118
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.
Figure 3. Installing the Ferrite on Signal Wires
1Ferrite 2cFP-CB- x Connector Block
V+
V–
cFP-AI-118
Voltage
Source
+
–
Amplifier
1 MΩ
Input
Impedance
1
2
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© National Instruments Corp. 5 cFP-AI-118
Install a tie wrap or other device to secure the ferrite in place, as
shown in Figure 4.
Figure 4. Ferrite Installed on Signal Wires and Secured with Tie Wrap
Note Figures 3 and 4 show signal wires connected to a
cFP-CB-xconnector 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
1Ferrite 2TieWrap 3cFP-CB- x Connector Block
2
1
3
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cFP-AI-118 6 ni.com
overranging feature enables the cFP-AI-118 to compensate for
field devices with span errors of up to +5% of full scale. Also, the
overranging feature helps prevent errors caused by clipping.
Filter Settings
The cFP-AI-118 has a 10 Hz digital sinc filter that provides 55 dB
of rejection at every multiple of 10 Hz 0.01%. You can configure
each channel separately in software for 10 Hz filtering or no
rejection. The filter can greatly reduce 50/60 Hz noise from nearby
AC power lines.
Update Rate
The all-channel update rate of the cFP-AI-118 is 10.42 kHz with
no filtering. If you enable filtering on any channel, the all-channel
update rate is 3.45 kHz.
Status Indicators
The cFP-AI-118 has two green status LEDs, POWER and
READY. After you insert the cFP-AI-118 into a backplane and
apply power to the connected network module, the green POWER
indicator lights up and the cFP-AI-118 informs the network
module of its presence. When the network module recognizes the
cFP-AI-118, it sends initial configuration information to the
cFP-AI-118. After the cFP-AI-118 receives this initial information,
the green READY indicator lights up and the module is in normal
operating mode.
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 about
determining which firmware you need and how to upgrade your
firmware, go to ni.com/info and enter fpmatrix.
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© National Instruments Corp. 7 cFP-AI-118
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the cFP-AI-118 to any circuits
that may contain hazardous voltages.1
This section describes the isolation of the cFP-AI-118 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 isolation, verified
by 2,300 Vrms , 5 s dielectric withstand test. The cFP-AI-118
provides double insulation (compliant with IEC 61010-1) for
working voltages of 250 Vrms2. 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
cFP-AI-118.
Even though the cFP-AI-118 is designed to handle applications
with hazardous potentials, follow these guidelines to ensure a safe
total system:
•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.
• 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 backplane PE ground
terminal to the system safety ground using 14 AWG (1.6 mm)
wire with a ring lug. Use the 5/16 in. panhead screw shipped
with the backplane to secure the ring lug to the backplane PE
ground terminal.
1 A hazardous voltage is a voltage greater than 42.4 Vpeak or 60 VDC.
2 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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cFP-AI-118 8 ni.com
• The cFP-AI-118 is a UL Recognized component. The entire
Compact FieldPoint system must be installed in a UL Listed,
suitably rated NEMA or IP enclosure for safe use.
Figure 5. Installing the Compact FieldPoint System in an Enclosure
• As with any hazardous voltage wiring, make sure that all
wiring and connections meet applicable electrical codes and
commonsense practices. Mount terminal bases and backplanes
in an area, position, or cabinet that prevents accidental or
unauthorized access to wiring that carries hazardous voltages.
•Donot use the cFP-AI-118 as the only isolating barrier
between human contact and working voltages higher than
250 Vrms .
• Operate the cFP-AI-118 only at or below Pollution Degree 2.
Pollution Degree 2 means that only nonconductive pollution
occurs in most cases. Occasionally, however, a temporary
conductivity caused by condensation must be expected.
•Donot operate FieldPoint products in an explosive atmosphere
or where there may be flammable gases or fumes. If you need
to operate FieldPoint products in such an environment, the
FieldPoint products must be in a suitably rated enclosure.
• Operate the cFP-AI-118 at or below Measurement Category II.
Measurement Category II is for measurements performed on
circuits directly connected to the low-voltage installation.
This category refers to local-level distribution, such as that
provided by a standard wall outlet.
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© National Instruments Corp. 9 cFP-AI-118
Specifications
The following specifications are typical for the –40 °C to 70 °C
temperature range, and for operation with the 10 Hz filter enabled,
unless otherwise noted.
Input Characteristics
Number of channels..........................8 differential
Maximum signal input range  15 V (15.75 V with
overranging)
Maximum voltage
(V+ or V– to earth)1,2........................ 250 Vrms, Measurement
Category II
ADC resolution.................................16 bits (refer to table)
Type of ADC..................................... Delta-sigma
Effective resolution by input range and filter setting
1 The maximum voltage that can be applied continuously between any terminal and
earth without creating a safety hazard.
2 When a hazardous voltage (>42.4 Vpeak or 60 VDC) 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.
Nominal
Input Range
With
Overranging
Effective
Resolution*
(No Filtering)
Effective
Resolution*
with 10 Hz Filter
1 V 1.05 V 100 V 32 V
5 V 5.25 V 160 V 160 V
10 V 10.5 V 320 V 320 V
15 V 15.75 V 480 V 480 V
0–1 V 0–1.05 V 100 V 16 V
0–5 V 0–5.25 V 100 V 80 V
0–10 V 0–10.5 V 160 V 160 V
0–15 V 0–15.75 V 240 V 240 V
*Includes quantization errors and typical rms noise.
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