National Instruments FIeldPoint FP-AO-200 Manuale utente

323343A-01 October 2002

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FieldPoint Operating Instructions

FP-AO-200 AND CFP-AO-200

Eight-Channel 20 mA Loop Output Modules

These operating instructions describe how to install and use the

National Instruments FP-AO-200 and cFP-AO-200 analog output

modules (referred to inclusively as the [c]FP-AO-200). For

information about configuring and accessing the [c]FP-AO-200

over a network, refer to the user manual for the FieldPoint network

module you are using.

Features

The [c]FP-AO-200 is a FieldPoint analog output module with the

following features:

• Eight 0–20 or 4–20 mA outputs

• 0.5 mA overranging

• 12-bit resolution

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

• Indicators for open current loops

• Short-circuit protection

• 2,300 Vrms transient overvoltage protection between the

inter-module communication bus and the I/O channels

• –40 to 70 °C operation

• Hot plug-and-play

FP-AO-200 and cFP-AO-200 2 ni.com

Installing the FP-AO-200

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

Hot plug-and-play enables you to install the FP-AO-200 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 complete the

following 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. Installing the FP-AO-200

Installing the cFP-AO-200

The cFP-AO-200 mounts on a Compact FieldPoint backplane

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

cFP-AO-200 onto a powered backplane without disturbing the

operation of other modules or connector blocks. The cFP-AO-200

receives operating power from the backplane.

Alignment

Slot

Key

Latch

Guide Rails

Terminal BaseI/O Module

To install the cFP-AO-200, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-AO-200 with the holes on

the backplane. The alignment keys on the cFP-AO-200 prevent

backward insertion.

2. Press firmly to seat the cFP-AO-200 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 2. Installing the cFP-AO-200

1 cFP Backplane

2 cFP Controller Module

3cFP-AO-200

4 Captive Screws

5 Screw Holes

2 1

FP-AO-200 and cFP-AO-200 4 ni.com

Wiring the [c]FP-AO-200

The FP-TB-xterminal base provides connections for the eight

output channels of the FP-AO-200. The cFP-CB-xconnector block

provides the same connections for the cFP-AO-200.

Table 1 lists the terminal assignments for the signals associated

with each channel.

Each channel has an output terminal, Iout; a common terminal,

COM; and a supply terminal, Vsup. The COM terminals of all

the channels are connected internally to each other and to the

C terminals, and the Vsup terminals are all connected to each other

and to the V terminals. Refer to the sections that follow for detailed

wiring instructions.

Sourcing Current to a Load

The [c]FP-AO-200 sources current from an external loop supply to

a load. The [c]FP-AO-200 can operate with an external loop supply

from 5 to 24 VDC. The voltage from the external supply

determines the maximum load impedance that the [c]FP-AO-200

can drive. With a 24 VDC loop supply, each output can drive up to

1kΩof load impedance. With a 5 VDC loop supply, each output

can only drive up to 100 Ω. The [c]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.

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

The [c]FP-AO-200 updates the output channels as new values are

sent 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 the current output circuit of a single channel.

Figure 3. [c]FP-A0-200 Current Output Circuit

Figure 4 shows how to connect loads to two channels of the

[c]FP-AO-200.

Figure 4. Connecting to Two Channels

Iout

Vsup

COM

Current

Sense

Open Loop

Indicator

12-Bit

Isolated DAC

Loop

Supply

Load

Iout

COM

Load

Iout

COM

–

[c]FP-AO-200

FP-AO-200 and cFP-AO-200 6 ni.com

Using an external COM connection may be more convenient in

your application than using the COM and C terminals on the

terminal base or connector block. Figure 5 shows how to connect

to two channels using an external COM connection.

Figure 5. Connecting to Two Channels Using an External COM Connection

Output Ranges

You can configure each channel independently for an output range

of either 0–20 mA or 4–20 mA. The default power-up setting for

each channel is 0–20 mA, with the output set to 0 mA. The

[c]FP-AO-200 has overranging of 0.5 mA in each of these ranges,

so that the actual full-scale ranges available are 0–20.5 mA and

3.5–20.5 mA. Overranging enables the [c]FP-AO-200 to

compensate for span and offset errors in field devices.

Open-Loop Detection

Each channel has a monitoring circuit that compares the actual

output current to the specified output current. If the [c]FP-AO-200

cannot source the specified output current for one or more

channels, the monitoring circuits turn on a red STATUS LED for

each affected channel and report the error condition to the network

module. Generally, the error condition is caused by an open current

loop—either the load device or the loop supply is disconnected.

However, the monitoring circuit also detects errors caused by load

impedances that are too high and by loop supply voltages that are

too low.

If the output of a [c]FP-AO-200 channel is set to 0 mA, the

monitoring circuit does not register an error condition because the

Loop

Supply

Load

Iout

COM

Iout

COM

C+

–

[c]FP-AO-200

[c]FP-AO-200 can always source zero current, even to an open

loop. Leave any unused and unwired channels in the default state

so that they do not generate error conditions.

Short-Circuit Protection

Each Iout terminal of the [c]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.

Status Indicators

Figure 6 shows the [c]FP-AO-200 status indicators.

Figure 6. Status Indicators

The [c]FP-AO-200 has two green status LEDs, POWER and

READY. After you insert the [c]FP-AO-200 into a terminal base or

backplane and apply power to the connected network module, the

green POWER indicator lights and the [c]FP-AO-200 informs the

network module of its presence. When the network module

recognizes the [c]FP-AO-200, it sends initial configuration

information to the [c]FP-AO-200. After receiving this initial

information, the green READY indicator lights and the

[c]FP-AO-200 is in 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 Open-Loop Detection section.

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.

FP-AO-200 and cFP-AO-200 8 ni.com

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the [c]FP-AO-200 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the [c]FP-AO-200 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.

Follow these guidelines to ensure a safe total system:

• The [c]FP-AO-200 has a safety isolation barrier between the

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

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.

• Operate the [c]FP-AO-200 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.

• Refer to the FieldPoint product label for regulatory

certification under hazardous location standards. If the

FieldPoint product is not certified for operation in hazardous

locations, do not operate it in an explosive atmosphere or

where there may be flammable gases or fumes.

Specifications

These specifications are typical for the range –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)

Current Output

Output range ..................................... 0–20 or 4–20 mA,

programmable (0–20.5

or 3.5–20.5 mA with

overranging)

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

power required

External loop power.......................... 5–24 VDC

Internal voltage drop.........................3 V

Resistive load....................................Up to 1 kΩwith 24 V

loop supply, up to 100 Ω

with 5 V supply1

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

open-circuit

Default power-up state...................... 0 mA

Accuracy

Absolute accuracy.............................0.1% typ, 0.3% max

(calculated as a percentage

of full-scale reading)

1 Maximum load resistance = (Supply voltage – Internal voltage drop)/0.0205 A

FP-AO-200 and cFP-AO-200 10 ni.com

Monotonicity1...................................Guaranteed over operating

temperature range

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

Physical Characteristics

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

READY indicators, 8 red

open-loop indicators

Weight

FP-AO-200 ................................. 140 g (4.8 oz)

cFP-AO-200 ............................... 110 g (3.7 oz)

Power Requirements

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

Isolation Voltage

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

channels

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

Environmental

FieldPoint modules are intended for indoor use only. For outdoor

use, FieldPoint modules must be mounted inside a sealed

enclosure.

Operating temperature ......................–40 to 70 °C

Storage temperature..........................–55 to 100 °C

Humidity ........................................... 10 to 90% RH,

noncondensing

Maximum altitude.............................2,000 m

Pollution Degree .............................. 2

1 A characteristic of a DAC in which the analog output always increases as the value

of the digital code input to it increases.

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