National Instruments FIeldPoint FP-AO-200 Manuale utente

FieldPoint

™

is a trademark of National Instruments Corporation. Product and company names are

trademarks or trade names of their respective companies.

321634A-01

FP-AO-200

8 Channel, 20 mA Loop Output Module

Highlights

• Eight 0-20/4-20 mA outputs

• 0.5 mA over-range ability

• 12-bit resolution DACs

• Open current loop indicators

• 3,000 V input-to-output isolation

• Double insulated for 250 V safe working voltage

• Up to 1 kOhm load impedance (with 24 V loop supply)

• Short circuit protection

• -40° to +70° C operation

Overview

The FP-AO-200 is a FieldPoint analog output module with eight

0-20/4-20 mA current loop outputs. You can use the FP-AO-200 to

drive devices using process current loops of either the 0-20 mA or

4-20 mA standards. Hot plug and play operation, safety isolation,

onboard diagnostics such as open loop detection, and over-ranging

ability ensure that installation and maintenance are as trouble free

as possible.

These operating instructions describe the installation, features, and

characteristics of the FP-AO-200. For details on configuring and

accessing the FP-AO-200 over a network, refer to the user manual

fortheparticularFieldPointnetworkmoduleyouareusingwiththe

FP-AO-200.

FPAO200.fm Page 1 Thursday, July 31, 1997 8:55 AM

Module Installation

The FP-AO-200 mounts on a FieldPoint terminal base (FP-TB-xx)

unit. The hot plug and play operation of the FP-AO-200 allows you

to install it onto a powered terminal base without disturbing the

operation of other modules or terminal bases. The FP-AO-200

receives operating power from the terminal base. Current loop

power is externally supplied.

To install the FP-AO-200, refer to Figure 1 and follow these steps:

1. Slide the terminal base key to either position X (used for any

module) or position 2 (used for the FP-AO-200 module).

2. Align the FP-AO-200 alignment slots with the guide rails on

the terminal base.

3. Press firmly to seat the FP-AO-200 in the terminal base. The

terminal base latch locks the FP-AO-200 into place when it is

firmly seated.

4. Connect a current loop supply for the outputs to the V and C

terminals of the terminal base.

Figure 1. Module Installation Diagram

Field Wiring

The FP-AO-200 sources current from an external loop supply to a

load (or field device). The terminal base provides connections for

both the external loop supply and for the eight output channels.

Figures 2a and 2b show examples of these basic wiring

connections. The positive terminal of the loop supply is connected

to the V terminal; the negative (or common) terminal is connected

to the C terminal. Each channel has an output terminal, Iout; a

common terminal, COM (internally connected to the C terminal);

Alignment

Slot

Key

Latch

Guide Rails

Terminal BaseI/O Module

FPAO200.fm Page 2 Thursday, July 31, 1997 8:55 AM

and a supply terminal, Vsup (internally connected to the V

terminal). As the figures show, connections to the C and COM

terminals are not required but may be used to simplify wiring. You

may use connections to the Vsup terminals to route power from the

V terminal to devices which require supplementary power.

Figure 2. Basic Field Connections (Two channels shown)

Table 1 lists the terminal assignments for the signals associated

with each channel.

Table 1. Terminal Assignments

Channel

Terminal Numbers

Iout COM Vsup

0 1 2, 18 17

1 3 4, 20 19

2 5 6, 22 21

3 7 8, 24 23

4 9 10, 26 25

5 11 12, 28 27

6 13 14, 30 29

7 15 16, 32 31

Loop

Supply

Load

out

COM

Load

out

COM

Loop

Supply

Load

out

Load

out

a. With COM Connection b. Without COM Connection

FPAO200.fm Page 3 Thursday, July 31, 1997 8:55 AM

Current Output Circuit

The output circuit of the FP-AO-200 is a sourcing current output,

which means that it is designed to source current provided by an

external loop supply to a device or load capable of sinking this

current to the common voltage of the loop supply. The FP-AO-200

can operate with an external loop supply from 5 to 24 VDC;

however,thisvoltagedictatesthemaximumloadimpedancewhich

theFP-AO-200 can drive.With a 24VDC loop supply,each output

can drive up to 1 kOhm of load impedance. With a 5 VDC loop

supply, each output can only drive up to 100 Ohms. The

FP-AO-200 detects and reports error conditions due to excessive

loads or insufficient loop supplies. For more information, refer to

the Open Loop Detection section in this document.

TheFP-AO-200 updates the outputchannels as new values aresent

to it by the network module. The time it takes to respond to a

change on a single channel is between 3 and 6 ms. The response

time to changes on all eight channels is 24 to 27 ms.

Figure 3 shows a diagram of the current output circuit of a single

channel.

Figure 3. FA-A0-200 Current Output Circuit

The FP-AO-200 has several unique features that promote reliable

operation, ease of use, and solid performance. These features are

described below.

out

sup

COM

Current

Sense

Open Loop

Indicator

12-Bit

Isolated DAC

FPAO200.fm Page 4 Thursday, July 31, 1997 8:55 AM

Output Ranges

Youmayconfiguretheoutputrange of each channel independently

for either 0-20 mA or 4-20 mA operation. The factory default

power-up setting for each channel is 0-20 mA, with output set to

0 mA. The FP-AO-200 has a built in over-range capability of

0.5 mA in each of these ranges, thus the actual full scale ranges

available are 0-20.5 mA and 3.5-20.5 mA. This extended range

feature allows the FP-AO-200 to compensate for span and offset

errors in field devices.

Open Loop Detection

Each channel has a monitoring circuit which compares the actual

output current to the desired output current. If the FP-AO-200

cannot source the desired output current for one or more channels,

these monitoring circuits turn on a red STATUS LED for each

affected channel and report this error condition to the network

module. Generally, the cause for this error condition is an open

current loop—either the load device or the loop supply is

disconnected. However, this method or detection also catches

errors caused by a load impedance that is too high, or a loop supply

voltage that is too low, to provide the desired output current.

If the output of the an FP-AO-200 channel is set to 0 mA, the

monitoring circuit does not register an error condition because the

FP-AO-200 can always source zero current, even to an open loop.

So, if any channels are unused and left unwired they should be left

in the default state of 0 mA to prevent unnecessary (and possibly

annoying) error indications.

Short Circuit Protection

Each output terminal Iout of the FP-AO-200 is protected against

short circuits to any of the other terminals. One or more channel

outputs can be short circuited indefinitely without causing damage

or improper operation of other channels, as long as the maximum

loop supply does not exceed 24 VDC. The outputs can withstand

indefinite short circuits with loop supplies of more than 24 VDC

(up to 36 VDC) without damage, but increasing internal

temperatures due to such conditions may cause improper operation

of other channels on the module.

FPAO200.fm Page 5 Thursday, July 31, 1997 8:55 AM

Status Indicators

Figure 4 shows the module label and status indicators. You can

remove the insertable label to see wiring diagrams for the output

channels.

Figure 4. Status Indicators

After the module has been inserted into a terminal base (and power

is applied), the module runs an internal boot up sequence and self

test. If this test passes, the green POWER indicator turns on and

the FP-AO-200 informs the network module of its presence. When

the network module recognizes the FP-AO-200, it sends initial

configuration information to the FP-AO-200. After processing this

initial information, the green READY indicator turns on and the

FP-AO-200 is in its normal operating mode. In addition to the

green POWER and READY indicators, each channel has a red,

numbered, error status indicator. For more information, refer to

the section on Open Loop Detection in this document.

Isolation and Safety

CAUTION: Read the following information before

attempting to connect ANY circuits which may contain

hazardous voltages to the FP-AO-200.

This section describes the isolation of the FP-AO-200 and its

compliance with international safety standards.

The field wiring connections of the FP-AO-200 are isolated from

the backplane provided by the terminal base with an optical and

galvanic isolation barrier designed and tested to provide protection

against fault voltages of up to 3000 Vrms. In addition, the

FPAO200.fm Page 6 Thursday, July 31, 1997 8:55 AM

FP-AO-200 provides double insulation (compliant to IEC 1010-1)

forworkingcommon mode voltages of 250 Vrms.Safetystandards

(such as those published by UL and IEC) require the use of double

insulation between hazardous voltages and any human-accessible

parts or circuits. You should never attempt to use any isolation

product between human accessible parts (such as DIN rails or

monitoring stations) and circuits which may be at hazardous

potentials under normal conditions, unless the product is

specifically designed (as the FP-AO-200 is) for such an

application.

Even when a product like the FP-AO-200 is used in applications

with hazardous potentials, follow these guidelines to ensure a safe

total system.

• The isolation of the FP-AO-200 is from input to output, not

between channels on the same module. If any of the channels

on a module are wired at a hazardous potential, ensure that all

other devices or circuits connected to that module are properly

insulated from human contact.

• Do not share the external loop supply voltages (V and C on the

terminal base) with other devices (including other FieldPoint

devices) unless those devices are also isolated from human

contact.

• As with any hazardous voltage wiring, ensure that all wiring

and connections meet with applicable electrical codes or

common sense practices. Mount terminal bases in an area,

position, or cabinet that prevents accidental or unauthorized

access to wiring with hazardous voltages.

• The isolation of the FP-AO-200 is certified as double insulated

for normal operating voltages of 250 Vrms. Do not use the

FP-AO-200 as the sole isolating barrier between human

contact and working voltages of more than 250 Vrms.

FPAO200.fm Page 7 Thursday, July 31, 1997 8:55 AM

Specifications

Thesespecificationsaretypical for -40° to +70° C unless otherwise

noted.

Output Characteristics

Number of channels .........................8 single-ended

Resolution ........................................12 bits, 1 in 4,096

(~6 µA/bit)

Isolation ............................................3,000 Vrms, input to output

Safety isolation, working voltage.....250 Vrms channel to earth

ground, designed per

IEC 1010

Current Output

Output Range....................................0-20 mA or 4-20 mA,

programmable (0-21 mA or

3.5-21 mA with over-range)

Type..................................................Current source, external loop

power required

External Loop Power........................5 to 24 VDC

Resistive load....................................up to 1 kOhm with 24 V

loop supply, up to 100 Ohm

with 5 V supply

Voltage Drop ....................................3 V

Protection..........................................Short-circuit and

open-circuit

Default Power-on state .....................0 mA

Accuracy

Absolute accuracy.............................0.2% FSR

Monotonicity ....................................Guaranteed over temperature

Offset temperature coefficient..........50 nA/°C

Gain temperature coefficient ............40 ppm/°C

Dynamic Characteristics

Max conversion rate .........................200 Updates/s

Slew rate ..........................................0.4 mA/µs

FPAO200.fm Page 8 Thursday, July 31, 1997 8:55 AM

Physical

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

READY indicators, 8 red

open loop indicators

Weight...............................................140 g (4.8 oz.)

Power Requirements

Power from network module............350 mW

Environment

Operating Temperature.....................-40 °C to +70 °C

Storage Temperature.........................-55 °C to + 100 °C

Relative Humidity.............................5% to 90% noncondensing

CE Mark Compliance

This product meets applicable EU directive(s) as follows:

Safety isolation ................................EN 61010 (double insulation

for 250 Vrms working

isolation, installation

category II)

EMC Directive

Immunity....................................EN 50082-1:1994

Emissions ..................................EN 55011:1991 Group I

Class A at 10 meters

Mechanical Dimensions

Figure 5 shows the mechanical dimensions of the FP-AO-200

installed onto a terminal base.

Figure 5. Mechanical Dimensions

4.31

[109.5]

3.58 [90.9]

4.19 [106.4]

FPAO200.fm Page 9 Thursday, July 31, 1997 8:55 AM

FPAO200.fm Page 10 Thursday, July 31, 1997 8:55 AM

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