National Instruments FIELDPOINT cFP-AI-118 Bedienungsanleitung

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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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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

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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-

Connector Block

V+

V–

cFP-AI-118

Voltage

Source

–

Amplifier

1 MΩ

Input

Impedance

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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-

Connector Block

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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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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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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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