National Instruments FieldPoint FP-DO-400 Bedienungsanleitung

FieldPoint™Operating Instructions

FP-DO-400 and cFP-DO-400

Eight-Channel, 5–30 V Digital Output Module

These operating instructions describe how to install and use the

National Instruments FP-DO-400 and cFP-DO-400 digital output

modules (referred to inclusively as the [c]FP-DO-400). For

information about configuring and accessing the [c]FP-DO-400

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

module you are using.

Features

The [c]FP-DO-400 is a FieldPoint digital output module with the

following features:

• Eight digital output channels

• Sourcing outputs supply up to 1.5 A per channel, 8 A2per

module

• Compatible with voltages from 5 to 30 VDC

• On/Off LED indicators

• 2,300 Vrms transient overvoltage protection

• –40 to 70 °C operation

• Hot swappable

• User-configurable startup states

Installing the FP-DO-400

The FP-DO-400 mounts on a FieldPoint terminal base (FP-TB-x),

which provides operating power to the module. Installing the

FP-DO-400 onto a powered terminal base does not disrupt the

operation of the FieldPoint bank.

FP-DO-400 and cFP-DO-400 2 ni.com

To install the FP-DO-400, 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 4, used for the FP-DO-400 module.

2. Align the FP-DO-400 alignment slots with the guide rails on

the terminal base.

3. Press firmly to seat the FP-DO-400 on the terminal base. When

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

place.

Figure 1. Installing the FP-DO-400

Installing the cFP-DO-400

The cFP-DO-400 mounts on a Compact FieldPoint backplane

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

Installing the cFP-DO-400 onto a powered backplane does not

disrupt the operation of the FieldPoint bank.

To install the cFP-DO-400, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-DO-400 with the holes on

the backplane. The alignment keys on the cFP-DO-400 prevent

backward insertion.

2. Press firmly to seat the cFP-DO-400 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-DO-400

Wiring the [c]FP-DO-400

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

output channels and for an external power supply to power the

output channels and field devices. The cFP-CB-xconnector block

provides the same connections. Each channel has one output

terminal (VOUT), one supply terminal (VSUP), and two common

terminals (COM). All eight channels are referenced to the COM

terminals. The V and VSUP terminals are all internally connected,

as are the C and COM terminals.

1 cFP I/O Module

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

3 5

FP-DO-400 and cFP-DO-400 4 ni.com

Use a 5–30 VDC external power supply for the output channels.

The power supply must provide enough current to power all of the

loads on the output channels, up to 1.5 A per channel.1Connect the

external power supply to multiple V and VSUP terminals and to

multiple C and COM terminals as needed to ensure that the

maximum current through any terminal is 2 A or less.

Install a 2 A maximum, fast-acting fuse between the external

power supply and the VSUP terminal on each channel. Install

a 1.5 A maximum, fast-acting fuse suitable for the load at the

VOUT terminal. Figure 3 shows fuses where appropriate.

Figure 3. Recommended Field Connections

Table 1 lists the terminal assignments for the signals of each

channel. Terminal assignments are also listed on the side panel of

the cFP-DO-400 and under the slide-in card on the front of the

FP-DO-400.

1 Refer to the Digital Output Circuit and Specifications sections for the maximum

output current level on all channels.

COM

OUT

SUP

[c]FP-DO-400

Load

–

5–30 VDC

External Power

Supply

To next channel

2 A max

1.5 A max

Digital Output Circuit

The [c]FP-DO-400 digital output channels are optically isolated

from the rest of the FieldPoint bank. The channels are sourcing

outputs, which means that the output terminal provides a path to

a voltage supply.

In the ON state, a transistor is turned on between the positive

external supply voltage (V and VSUP) and the output terminal

(VOUT). In the OFF state, this transistor is turned off, allowing only

a small leakage current to flow.

Ensure that the load on any channel does not draw more than 1.5 A,

and the sum of the squares of the total current supplied by all

channels at any time is no more than 8 A2.

To determine whether the total current is within the limit, square

the current on each channel and add the squares together. If the sum

of all the squares is less than or equal to 8 A2, the total current is

within the limit. In the following example, three channels supply

1.5 A each and one channel supplies 1 A:

(1.5 A)2+ (1.5 A)2+ (1.5 A)2+ (1 A)2≤ 8 A2

Table 1. Terminal Assignments

Channel

Terminal Numbers

VOUT1VSUP2COM

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

511 27 12, 28

613 29 14, 30

715 31 16, 32

1Install a 1.5 A maximum, fast-acting fuse on each VOUT terminal.

2Install a 2 A maximum, fast-acting fuse on each V and VSUP terminal.

FP-DO-400 and cFP-DO-400 6 ni.com

Caution The outputs must not be short-circuited to the

potential of the C or COM terminals (the negative voltage

of the external supply). Short circuits damage the

[c]FP-DO-400 output channels. Check all wiring

carefully before applying power.

In the ON state, the effective resistance between the output (VOUT)

and the supply voltage (V and VSUP) is 0.3 Ω. This resistance

causes a voltage drop between the external supply voltage and the

output voltage. Table 2 lists the actual output voltages based on the

voltage provided by the external power supply.

If the external power supply you are using does not provide one of

the voltages in Table 2, use the following equation to calculate the

actual voltage output.

ActualOutput = Vext – (Iflow × 0.3 Ω)

where ActualOutput is the voltage sourced by VOUT

Vext is the voltage provided by the external power supply

Iflow is the current flow through the VOUT terminal

Note Using a 5–10 V external supply increases the

output impedance to 2 Ω. This increase limits the amount

of current each channel can supply. Refer to the

Specifications section for more information.

Table 3 shows some common combinations of output current levels

on several channels. Combinations are valid from –40 to 50 °C for

the cFP-DO-400 and from –40 to 70 °C for the FP-DO-400.

Table 2. [c]FP-DO-400 Output Voltages for a 0.5 A Current Flow

VVOUT

54.85

10 9.85

12 11.85

24 23.85

30 29.85

Protection for Inductive Loads

When an inductive load, such as a motor or relay, is connected

to an output, a large counter-electromotive force may occur at

switching time because of the energy stored in the inductive load.

This flyback voltage can damage the output and the power supply.

It is best to limit flyback voltages by installing a flyback diode

across an inductive load. Typically, you should mount the flyback

diode within 18 in. of the load. Figure 4 shows one channel

connected to an inductive load with a flyback diode.

Figure 4. Digital Output Circuit (External Power Supply Not Shown)

The [c]FP-DO-400 contains flyback diodes to prevent excessively

high voltage from damaging the module. National Instruments still

recommends using an external protection circuit across any

inductive load.

Table 3. Common Output Configurations

Channel Subset Channel Subset Total A2

8 channels @ 1 A —8 A2

5 channels @ 1.25 A —7.81 A2

4 channels @ 1.25 A 3 channels @ 0.75 A 7.94 A2

3 channels at 1.5 A 1 channel @ 1 A 7.75 A2

COM

OUT

SUP

CFlyback Diode

for Inductive Load

[c]FP-DO-400

Load

1.5 A max

FP-DO-400 and cFP-DO-400 8 ni.com

Status Indicators

Figure 5 shows the status indicator LEDs on the [c]FP-DO-400.

Figure 5. Status Indicators

The [c]FP-DO-400 has two green status LEDs, POWER and

READY. After you install the FP-DO-400 onto a terminal base

or the cFP-DO-400 onto a backplane and apply power to the

connected network module, the green POWER indicator lights

and the [c]FP-DO-400 informs the network module of its presence.

When the network module recognizes the [c]FP-DO-400, it sends

initial configuration information to the [c]FP-DO-400. After the

[c]FP-DO-400 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, each

channel has a numbered, green output state indicator that lights

when the channel is in the ON state.

Upgrading Your FieldPoint Firmware

You may need to upgrade your FieldPoint firmware when you add

new I/O modules to your 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-DO-400 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the [c]FP-DO-400 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-DO-400 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-DO-400 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.

FP-DO-400 and cFP-DO-400 10 ni.com

Specifications

These specifications are typical for the range –40 to 70 °C unless

otherwise noted.

Output Characteristics

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

Output type ....................................... Sourcing

Voltage range .................................... 5–30 VDC

Output impedance at 10–30 V .......... 0.3 Ω

(0.3 V drop at 1 A)

Maximum output current at 10–30 V

Per channel

All channels1

Output impedance at 5–10 V ............2 Ω

Maximum output current at 5–10 V

Per channel ................................. 0.67 A

All channels................................ 1.35 A2

Physical Characteristics

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

READY indicators, eight

green output state indicators

Module

Temperature Ranges

–40to50°C 50 to 60 °C 60 to 70 °C

cFP-DO-400 1.5 A 1.0 A 1.0 A

FP-DO-400 1.5 A 1.5 A 1.5 A

1 Refer to the Digital Output Circuit section for more information about the maximum

current across all channels.

Module

Temperature Ranges

–40to50°C 50 to 60 °C 60 to 70 °C

cFP-DO-400 8 A28 A24 A2

FP-DO-400 8 A28 A28 A2

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