National Instruments FieldPoint FP-DIO-550 Manuale utente

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FieldPoint™Operating Instructions

FP-DIO-550 and cFP-DIO-550

Eight-Channel Digital Input,

Eight-Channel Digital Output Module

These operating instructions describe how to install and use the

National Instruments FP-DIO-550 and cFP-DIO-550 digital I/O

modules, referred to inclusively as the [c]FP-DIO-550. For

information about configuring and accessing the [c]FP-DIO-550

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

module you are using.

Features

The [c]FP-DIO-550 is a FieldPoint digital I/O module with the

following features:

• Eight digital input channels compatible with sinking, sourcing,

and differential devices

• Eight sourcing digital output channels

• Up to 30 VDC digital input

• Up to 30 VDC, 250 mA digital output

• On/Off LED indicators

•250V

rms CAT II continuous channel-to-ground isolation,

verified by 2,300 Vrms , 5 s dielectric withstand test

• Hot swappable

Installing the FP-DIO-550

The FP-DIO-550 mounts on a FieldPoint terminal base (FP-TB-x),

which provides operating power to the module. Installing the

FP-DIO-550 onto a powered terminal base does not disrupt the

operation of the bank.

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To install the FP-DIO-550, refer to Figure 1 and complete the

following steps:

1. Slide the terminal base key to position X.

2. Align the FP-DIO-550 alignment slots with the guide rails on

the terminal base.

3. Press firmly to seat the FP-DIO-550 on the terminal base.

When the module is firmly seated, the terminal base latch locks

it into place.

Figure 1. Installing the FP-DIO-550

Installing the cFP-DIO-550

The cFP-DIO-550 mounts on a Compact FieldPoint backplane

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

Installing the cFP-DIO-550 onto a powered backplane does not

disrupt the operation of the bank.

To install the cFP-DIO-550, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-DIO-550 with the holes

on the backplane. The alignment keys on the cFP-DIO-550

prevent backward insertion.

2. Press firmly to seat the cFP-DIO-550 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.

1 I/O Module

2TerminalBase

3 Alignment Slot

4Key

5Latch

6 Guide Rails

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Figure 2. Installing the cFP-DIO-550

Wiring the [c]FP-DIO-550

The FP-TB-xterminal base has connections for each FP-DIO-550

input and output channel, and for an external power supply to

power field devices. The cFP-CB-xconnector block provides the

same connections for the cFP-DIO-550.

Each input channel has two input terminals, IN+ and IN–. Each

output channel has one output terminal, VOUT, and one COM

terminal. All eight output channels are referenced to the COM

terminals. The C and COM terminals are all internally connected.

Connect the positive lead of the external power supply to both

V terminals and the negative lead to both C terminals. Ensure that

the current through each V terminal can never exceed 2 A.

1 cFP I/O Module

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

3 5

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

power supply and the V terminals. The wiring diagrams in this

document show fuses where appropriate.

Table 1. Input Terminal Assignments

Channel

Terminal Numbers

IN+ IN–

In 0 1 2

In 1 3 4

In 2 5 6

In 3 7 8

In 4 17 18

In 5 19 20

In 6 21 22

In 7 23 24

Table 2. Output Terminal Assignments

Channel

Terminal Numbers

VOUT COM

Out 0 9 10

Out 1 11 12

Out 2 13 14

Out 3 15 16

Out 4 25 26

Out 5 27 28

Out 6 29 30

Out 7 31 32

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Digital Input

The [c]FP-DIO-550 has eight current-limited input channels with

optical isolators. Each channel has two input terminals, IN+and

IN–. When the voltage across the IN+and IN–terminals is at least

11 V, signal current flows through the input and turns on the optical

isolator, and the channel is ON. The current-limiting circuitry

limits the amount of current flow to 7 mA.

When the voltage across the IN+and IN–terminals is less than 5 V,

the channel is OFF. When the voltage is between 5 and 11 V, the

channel may be ON or OFF.

The input channels are floating, which means that they do not share

a common ground reference. Make sure that there is no more than

30 V difference between any two input terminals.

Figure 3 shows the input circuitry of a single channel.

Figure 3. [c]FP-DIO-550 Input Circuit

The devices you connect to the [c]FP-DIO-550 should have

OFF-state leakage currents of less than 300 μA to ensure that

they do not cause false ON readings.

Digital Input Filter

Each input channel has a filter that can prevent electrical noise

from causing false readings. In Measurement & Automation

Explorer (MAX), you can select a value from 0 to 65,535 μs for the

digital input filter on each channel. The filter rejects pulses that are

1 μs or more shorter than the length you select. If you select 0 μs,

the filter is disabled.

IN+

IN–

Status

Indicator

Optical

Isolation

[c]FP-DIO-550

Current

Limiter

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Input Latching

In MAX, you can configure each input channel to operate in either

standard mode or latch mode. In standard mode, the channel

returns a value of TRUE when the input is high and FALSE when

the input is low. In latch mode, the channel latches to one value

when it detects a specific input signal state and retains that value

until you reset the channel. The two latch modes are Latch TRUE

on high and Latch FALSE on low. If the channel is in Latch TRUE

on high mode, it returns TRUE when it detects a high input signal

and continues to return TRUE until the channel is reset, regardless

of subsequent changes to the input signal. If the channel is in Latch

FALSE on low mode, it returns FALSE when it detects a low input

signal and continues to return FALSE until the channel is reset. To

unlatch and reset the channel, send the Reset Latch command.

Note If the input signal matches the value that the

channel is configured to detect when you put the

channel in one of the latch modes, the channel latches

immediately. Similarly, if you attempt to reset the

channel when the input signal is in the state that the

channel is set to detect, the channel will not reset.

You can use input latching to detect short signal pulses that

software polling might otherwise miss.

Connecting a Differential-Output Device

to the [c]FP-DIO-550

You can connect a differential-output device to an input channel of

the [c]FP-DIO-550. Connect the positive lead to the IN+ terminal

of the channel and connect the negative lead to the IN– terminal of

the channel. Refer to Figure 4.

Figure 4. Connecting a Differential-Output Device

to One Channel of the [c]FP-DIO-550

IN–

IN+

Input

Circuitry

Differential

Output

Device

–

[c]FP-DIO-550

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Connecting a Sinking-Output Device

to the [c]FP-DIO-550

You can connect an externally powered sinking-output device to an

input channel of the [c]FP-DIO-550. A sinking-output device

provides a path to ground. Connect the positive terminal of the

power supply to the IN+ terminal of the channel and connect the

output terminal of the device to the IN– terminal of the channel.

Refer to Figure 5.

Figure 5. Connecting an Externally Powered Sinking-Output Device

to One Channel of the [c]FP-DIO-550

Connecting a Sourcing-Output Device

to the [c]FP-DIO-550

You can connect an externally powered sourcing-output device to

an input channel of the [c]FP-DIO-550. A sourcing-output device

provides a path to a voltage source. Connect the output terminal

of the device to the IN+ terminal of the channel and connect the

negative terminal of the external power supply to the IN– terminal

of the channel. Refer to Figure 6.

Figure 6. Connecting an Externally Powered Sourcing-Output Device

to One Channel of the [c]FP-DIO-550

IN–

IN+

Input

Circuitry

Sinking-

Output

Device

(NPN)

–

[c]FP-DIO-550

External

Power

Supply

(30 V Max)

IN–

IN+

Input

Circuitry

Sourcing-

Output

Device

(PNP)

–

External

Power

Supply

(30 V Max)

[c]FP-DIO-550

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Digital Output Circuit

The [c]FP-DIO-550 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 V terminal

and the VOUT terminal. 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

250 mA.

Caution Do not short-circuit outputs to C or COM

terminals. Short circuits can damage the outputs. Check

all wiring carefully before applying power.

In the ON state, the maximum effective resistance between the

VOUT terminal and the V terminal is 200 mΩ. This resistance

causes a voltage drop between the external supply voltage and the

output voltage. Table 3 lists the minimum output voltages based on

the voltage provided by the external power supply.

Table 3. [c]FP-DIO-550 Output Voltages for 250 mA Current Flow

VVOUT

10 9.95

12 11.95

24 23.95

30 29.95

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Figure 7. Digital Output Circuit

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

the voltages in Table 3, use the following equation to calculate the

actual voltage output.

ActualOutput = Vext – (I0×0.20 Ω)

where ActualOutput is the voltage sourced by VOUT

Vext is the voltage provided by the external power supply

I0is the current flow through the VOUT terminal

Output Pattern Matching

Pattern match mode enables you to configure output channels to

respond directly to specific patterns of states on the input channels.

In MAX, you can configure each output channel to turn on or off

if the input pattern occurs. Also, you can configure each output

channel to latch on or off until it is reset or to update continually

based on the input pattern.

VOUT

COM

[c]FP-DIO-550

Optocoupler Output

Protection

Load

2 A

Max –

+10–30 VDC

External

Power

Supply

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