National Instruments FP-AI-102 Manuale utente

National Instruments FP-AI-102 Manual

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323279A-01 October 2002

FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.

Product and company names mentioned herein are trademarks or trade names of their respective companies.

For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,

the patents.txt file on your CD, or ni.com/patents.

FieldPoint Operating Instructions

FP-AI-102 AND CFP-AI-102

Eight-Channel, High-Voltage,

12-Bit Analog Input Modules

These operating instructions describe how to install and use the

FP-AI-102 and cFP-AI-102 analog input modules (referred to

inclusively as the [c]FP-AI-102). For information about

configuring and accessing the [c]FP-AI-102 over a network, refer

to the user manual for the FieldPoint network module you are

using.

Features

The [c]FP-AI-102 is a FieldPoint analog input module with the

following features:

• Eight analog voltage input channels

• Six input ranges: 0–20, 0–60, 0–120, ±20, ±60, and ±120 V

• 12-bit resolution

• 2,300 V transient overvoltage protection between the

inter-module communication bus and the I/O channels

•250V

rms isolation voltage rating

• –40 to 70 °C operation

• Hot plug-and-play

Installing the FP-AI-102

The FP-AI-102 mounts on a FieldPoint terminal base (FP-TB-x).

Hot plug-and-play enables you to install the FP-AI-102 onto a

powered terminal base without disturbing the operation of other

modules or terminal bases. The FP-AI-102 receives operating

power from the terminal base.

FP-AI-102 and cFP-AI-102 2 ni.com

To install the FP-AI-102, 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-102 module).

2. Align the FP-AI-102 alignment slots with the guide rails on the

terminal base.

3. Press firmly to seat the FP-AI-102 on the terminal base. When

the module is firmly seated, the terminal base latch locks it into

place.

Figure 1. Installing the FP-AI-102

Installing the cFP-AI-102

The cFP-AI-102 mounts on a Compact FieldPoint backplane

(cFP-BP-x). Hot plug-and-play enables you to install the

cFP-AI-102 onto a powered backplane without disturbing the

operation of other modules or connector blocks. The cFP-AI-102

receives operating power from the backplane.

To install the cFP-AI-102, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-AI-102 with the holes on

the backplane. The alignment keys on the cFP-AI-102 prevent

backward insertion.

2. Press firmly to seat the cFP-AI-102 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.

Alignment

Slot

Key

Latch

Guide Rails

Terminal BaseI/O Module

Figure 2. Installing the cFP-AI-102

Wiring the [c]FP-AI-102

The FP-TB-xterminal bases have connections for each of the eight

input channels on the FP-AI-102 and for an external supply to

power field devices. The cFP-CB-xconnector blocks provide the

same connections for the cFP-AI-102.

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.

1 cFP Backplane

2 cFP Controller Module

3cFP-AI-102

4 Captive Screws

5 Screw Holes

2 1

FP-AI-102 and cFP-AI-102 4 ni.com

Each channel has one input terminal (Vin) for voltage input. All

eight voltage inputs share a common ground reference, 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. Field devices source power from

the Vsup and COM terminals. Refer to the following section for

detailed wiring diagrams.

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 system.

Table 1. Terminal Assignments

Channel

Terminal Numbers

Vin Vsup COM

0 1 17 2, 18

1 3 19 4, 20

2 5 21 6, 22

3 7 23 8, 24

4 9 25 10, 26

5 11 27 12, 28

6 13 29 14, 30

7 15 31 16, 32

Measuring Voltage with the [c]FP-AI-102

The [c]FP-AI-102 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. [c]FP-AI-102 Analog Input Circuit, One Channel

The input ranges for voltage signals are 0–20, 0–60, 0–120, ±20,

±60, and ±120 V. Connect the positive lead of a voltage source to

the Vin terminal and the negative lead to the COM terminal.

Figure 4 shows how to connect a voltage source without an

external power supply to one channel of the [c]FP-AI-102.

Figure 4. Voltage Source without External Power Supply

sup

COM

Filter

12-Bit

Isolated ADC

Vsup

Vin

To Analog

Input Circuitry

To Next

Channel

1.0 MΩ

Input

Impedance

COM

[c]FP-AI-102

Voltage

Source

–

FP-AI-102 and cFP-AI-102 6 ni.com

Figure 5 show how to connect a voltage source with an external

power supply to one channel of the [c]FP-AI-102.

Figure 5. Voltage Source with External Power Supply

Status Indicators

The [c]FP-AI-102 has two green status LEDs, POWER and

READY. After you insert the [c]FP-AI-102 into a terminal base or

backplane and apply power to the connected network module, the

green POWER indicator lights and the [c]FP-AI-102 informs the

network module of its presence. When the network module

recognizes the [c]FP-AI-102, it sends initial configuration

information to the [c]FP-AI-102. After the [c]FP-AI-102 receives

this initial information, the green READY indicator lights 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 on

determining which firmware you need and how to upgrade, go to

ni.com/info and enter fpmatrix.

sup

To Analog

Input Circuitry

To Next

Channel

1.0 MΩ

Input

Impedance

COM

[c]FP-AI-102

Powered

Voltage

Transducer

OUT

–

External

Power

Supply

–

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the [c]FP-AI-102 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the [c]FP-AI-102 and its

compliance with international safety standards. The field wiring

connections are isolated from the backplane and the inter-module

communication bus. The isolation is provided by the module,

which has optical and galvanic isolation barriers designed and

tested to protect against transient fault voltages of up to 2,300 Vrms.

The [c]FP-AI-102 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-102.

Even though the [c]FP-AI-102 is designed to handle applications

with hazardous potentials, follow these guidelines to ensure a safe

total system:

• The [c]FP-AI-102 has a safety isolation barrier between the

inter-module communication bus and the I/O channels. There

is no isolation between channels unless otherwise noted. 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 (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.

FP-AI-102 and cFP-AI-102 8 ni.com

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.

• 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.

• The isolation of the [c]FP-AI-102 is certified as

double-insulated for working voltages of 250 Vrms. Do not use

the [c]FP-AI-102 as the only isolating barrier between human

contact and working voltages of more than 250 Vrms.

• Operate the [c]FP-AI-102 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 [c]FP-AI-102 at or below Installation Category II.

Installation Category II is for measurements performed on

circuits directly connected to the electrical distribution system.

This category refers to local-level distribution, such as that

provided by a standard wall outlet.

Specifications

The following specifications are typical for the range –40 to 70 °C

unless otherwise noted. Gain error is calculated as a percentage of

input.

Input Characteristics

Number of channels.......................... 8

ADC resolution................................. 12 bits

Type of ADC.....................................Successive approximation

Update rate (all channels) ................. 360 Hz (2.8 ms)

Input signal ranges (software selectable by channel)

Gain error

15 to 35 °C ................................. 0.1% typ, 0.2% max

–40 to 70 °C ............................... 0.2% typ, 0.3% max

Input impedance................................ 1.0 MΩ

Input noise ........................................7 mV + 1 LSB peak-to-peak

Signal input bandwidth..................... 170 Hz

Physical

Indicators .......................................... Green POWER and

READY indicators

Weight

FP-AI-102................................... 145 g (5.1 oz)

cFP-AI-102................................. 115 g (4.0 oz)

Power Requirements

Power from network module ............ 400 mW

Isolation Voltage

Maximum isolation voltage ..............250 Vrms, Installation

Category II

Channel-to-channel isolation............ No isolation between

channels

Transient overvoltage........................ 2,300 Vrms

Voltage

Input

Range

Effective

Resolution*

Typical

Offset Error

at 15 to 35 °C

Maximum

Offset Error

at –40 to 70 °C

0–20 V 15 mV 20 mV 100 mV

0–60 V 40 mV 50 mV 150 mV

0–120 V 70 mV 100 mV 250 mV

±20 V 25 mV 40 mV 175 mV

±60 V 70 mV 120 mV 350 mV

±120 V 125 mV 220 mV 700 mV

*Includes quantization errors and rms noise.

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