National Instruments FieldPoint FP-AI-110 Bedienungsanleitung

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

(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

3 5

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.

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

16-Bit

Isolated ADC

Filter

VSUP

VIN

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

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

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

To Analog

Input Circuitry

To Next Channel

COM

[c]FP-AI-110

IIN

Current

Source

1 A

Max

VSUP

VIN

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

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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