National Instruments FieldPoint FP-AI-100 Bedienungsanleitung

National Instruments FP-AI-100 Manual

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FieldPoint™Operating Instructions

FP-AI-100 and cFP-AI-100

Eight-Channel, 12-Bit Analog Input Modules

These operating instructions describe how to install and use the

FP-AI-100 and cFP-AI-100 analog input modules (referred to

inclusively as the [c]FP-AI-100). For information about

configuring and accessing the [c]FP-AI-100 over a network,

refer to the user manual for the FieldPoint network module you are

using.

Features

The [c]FP-AI-100 is a FieldPoint analog input module with the

following features:

• Eight analog voltage or current input channels

• 11 input ranges: 0–1 V, 0–5 V, 0–15 V, 0–30 V, ±1 V, ±5 V,

±15 V, ±30 V, 0–20 mA, 4–20 mA, and ±20 mA

• 12-bit resolution

• 250 Vrms CAT II continuous channel-to-ground isolation,

verified by 2,300 Vrms,1 minute dielectric withstand test

• –40 to 70 °C operation

• Hot swappable

Installing the FP-AI-100

The FP-AI-100 mounts on a FieldPoint terminal base (FP-TB-x),

which provides operating power to the module. Installing the

FP-AI-100 onto a powered terminal base does not disrupt the

operation of the FieldPoint bank.

FP-AI-100 and cFP-AI-100 2 ni.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).

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 FP-AI-100 is firmly seated, the latch on the terminal base

locks it into place.

Figure 1. Installing the FP-AI-100

Installing the cFP-AI-100

The cFP-AI-100 mounts on a Compact FieldPoint backplane

(cFP-BP-x), which provides operating power to the module.

Installing the cFP-AI-100 onto a powered backplane does not

disrupt the operation of the FieldPoint bank.

To install the cFP-AI-100, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-AI-100 with the holes on

the backplane. The alignment keys on the cFP-AI-100 prevent

backward insertion.

2. Press firmly to seat the cFP-AI-100 on the backplane.

1 I/O Module

2 Terminal Base

3 Alignment Slot

4Key

5 Latch

6 Guide Rails

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 2. Installing the cFP-AI-100

Wiring the [c]FP-AI-100

The FP-TB-xterminal base has connections for each of the eight

input channels and for an optional external supply to power field

devices. The cFP-CB-xconnector block provides the same

connections.

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.

1cFP-AI-100

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

3 5

FP-AI-100 and cFP-AI-100 4 ni.com

Each channel has separate input terminals for voltage (Vin) and

current (Iin) input. Voltage and current inputs are referenced to 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. Refer to the sections that follow

for detailed wiring diagrams.

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.

Taking Measurements

with the [c]FP-AI-100

The [c]FP-AI-100 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.

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

Figure 3. [c]FP-AI-100 Analog Input Circuit, One Channel

Measuring Voltage with the [c]FP-AI-100

The input ranges for voltage signals are 0–1 V, 0–5 V, 0–15 V,

0–30 V, ±1 V, ±5 V, ±15 V, and ±30 V.

Figure 4 shows how to connect a voltage source without an

external power supply to one channel of the [c]FP-AI-100.

Figure 4. Voltage Source without External Power Supply

SUP

COM

12-Bit

Isolated ADC

Filter

sup

To Analog

Input Circuitry

To Next

Channel

1.5 MΩ

Input

Impedance

COM

[c]FP-AI-100

Voltage

Source

–

FP-AI-100 and cFP-AI-100 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-100.

Figure 5. Voltage Source with External Power Supply

Measuring Current with the [c]FP-AI-100

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.

Vsup

Vin

To Analog

Input Circuitry

To Next

Channel

1.5 MΩ

Input

Impedance

COM

[c]FP-AI-100

Powered

Voltage

Transducer

OUT

–

External

Power

Supply

–

Figure 6 shows how to connect a current source without an external

power supply to one channel of the [c]FP-AI-100.

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-100.

Figure 7. Current Source with External Power Supply

sup

To Analog

Input Circuitry

To Next

Channel

100 Ω

COM

[c]FP-AI-100

Current

Source

Vsup

Iin

To Analog

Input Circuitry

To Next

Channel

100 Ω

COM

[c]FP-AI-100

Loop-Powered

Current

Transducer

External

Power

Supply

–

FP-AI-100 and cFP-AI-100 8 ni.com

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.

If a channel is not in use, short the positive input to ground and

configure the channel for a bipolar input range. Small fluctuations

in floating input signals can cause the red Out of Range status

LED on the module to light if the channel is configured for a

unipolar range. Similarly, if a channel is configured for 4–25 mA

input and the input current is 0 mA, the channel is always out of

range.

Overranging

The [c]FP-AI-100 has an overranging feature that measures a little

beyond the nominal values of each range. For example, the actual

measurement limit of the ±5 V range is ±6.0 V. The overranging

feature allows the [c]FP-AI-100 to compensate for field devices

with span errors of up to +20% of full scale. Also, with the

overranging feature, a noisy signal near full scale does not create

rectification errors.

Status Indicators

The [c]FP-AI-100 has two green status LEDs, POWER and

READY. After you insert the [c]FP-AI-100 into a terminal base

or backplane and apply power to the connected network module,

the green POWER indicator lights and the [c]FP-AI-100 informs

the network module of its presence. When the network module

recognizes the [c]FP-AI-100, it sends initial configuration

information to the [c]FP-AI-100. After the [c]FP-AI-100 receives

this initial information, the green READY indicator lights and the

module is in normal operating mode.

In addition to the green POWER and READY indicators, the

[c]FP-AI-100 has one red status LED that lights when the input

signal on any channel is outside the configured range. Refer to the

Input Ranges section for information about selecting input ranges.

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 the

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-100 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the [c]FP-AI-100 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 Installation Category II continuous isolation, verified by

2,300 Vrms, 1 minute dielectric withstand test. The [c]FP-AI-100

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-100.

Even though the [c]FP-AI-100 is designed to handle applications

with hazardous potentials, follow these guidelines to ensure a safe

total system:

• There is no isolation between channels on the [c]FP-AI-100.

If a hazardous voltage is present on any channel, all channels

are considered hazardous. Make sure that all other devices and

circuits connected to the 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.

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