National Instruments FieldPoint cFP-DI-304 User manual

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FieldPoint™Operating Instructions

cFP-DI-304

32-Channel, 24 VDC Sinking Digital Input Module

These operating instructions describe how to install and use

the cFP-DI-304 digital input module. For information about

configuring and accessing the cFP-DI-304 over a network, refer to

the user manual for the FieldPoint network module you are using.

Features

The cFP-DI-304 is a FieldPoint digital input module with the

following features:

• 32 sinking digital input channels

• Compatible with 24 VDC sourcing-output devices

• Inputs protected up to 30 VDC (up to 60 VDC on up to

eight channels)

•250V

rms CAT II continuous channel-to-ground isolation,

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

• On/off LED indicators

• Hot swappable

Installing the cFP-DI-304

The cFP-DI-304 mounts on a Compact FieldPoint backplane

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

Installing the cFP-DI-304 onto a powered backplane does not

disrupt the operation of the FieldPoint bank.

To install the cFP-DI-304, refer to Figure 1 and complete the

following steps:

1. Align the captive screws on the cFP-DI-304 with the holes on

the backplane. The alignment keys on the cFP-DI-304 prevent

backward insertion.

2. Press firmly to seat the cFP-DI-304 on the backplane.

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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 1. Installing the cFP-DI-304

1cFP-DI-304

2CaptiveScrews

3 cFP Controller Module

4ScrewHoles

5 cFP-BP-x Backplane

3 5

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Mounting the System Upright

To ensure maximum cooling efficiency, mount the Compact

FieldPoint system so that the I/O module vents are at the top and

bottom as shown in Figure 2.

Figure 2. Mounting the System Upright

Wiring the cFP-DI-304

The cFP-CB-1 has connections for each of the 32 input channels.

You can use the cFP-CB-3, but it has connections for only

16 channels. Each channel has one input terminal, VIN.

Table 1 lists the VIN terminal assignment for each channel.

Table 1. Terminal Assignments

Channel VIN Term in al

0 1

1 2

2 3

3 4

4 5

5 6

6 7

7 8

8 9

910

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You can wire each channel for use with a sourcing-output device.

A sourcing-output device provides a path to a voltage source.

10 11

11 12

12 13

13 14

14 15

15 16

16 17

17 18

18 19

19 20

20 21

21 22

22 23

23 24

24 25

25 26

26 27

27 28

28 29

29 30

30 31

31 32

Table 1. Terminal Assignments (Continued)

Channel VIN Term in al

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Figure 3 shows how to connect a sourcing-output device to one

channel of the cFP-DI-304.

Figure 3. Sourcing-Output Device Connected to One Channel

Note You must ground all connected devices to the

C terminals.

Digital Input Circuitry

The cFP-DI-304 has 32 input channels. You can connect a voltage

signal to each channel. All 32 input channels share a common

ground reference that is isolated from other modules in the

FieldPoint system.

When you apply a voltage above 10 V to a VIN terminal, current

flows through that terminal and the channel is ON. When you

apply a voltage below 5 V to a VIN terminal, the channel is OFF.

When you apply a voltage between 5 and 10 V, the channel may be

ON or OFF.

The cFP-DI-304 has sinking inputs, which means that current

flows through the VIN terminal to the input circuitry. The inputs are

compatible with sourcing-output devices capable of sourcing

or driving current from a positive supply voltage to common.

A sensor is an example of a sourcing-output device.

Make sure that devices you connect to the cFP-DI-304 have OFF

state leakage currents of less than 150 µA to ensure that they do not

provide false ON state readings to the cFP-DI-304.

Input

Circuitry

Sourcing-

Output

Device

cFP-DI-304

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Status Indicators

The cFP-DI-304 has two green status LEDs, POWER and

READY. After you insert the cFP-DI-304 into a backplane and

apply power to the connected network module, the green POWER

indicator lights and the cFP-DI-304 informs the network module

of its presence. When the network module recognizes the

cFP-DI-304, it sends initial configuration information to the

cFP-DI-304. After the cFP-DI-304 receives this initial information,

the green READY indicator lights and the module is in normal

operating mode.

In addition to the POWER and READY lights, each channel has a

numbered green status indicator that lights when the channel is in

the ON state.

Upgrading the FieldPoint Software

In order to use the cFP-DI-304, you must have FieldPoint software

version 5.0 or later installed on the host computer. Go to

ni.com/support, select Drivers and Updates»Current

Versions»Distributed I/O—FieldPoint, and select the latest

version under Driver.

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 about

determining which firmware you need and how to upgrade your

firmware, go to ni.com/info and enter fpmatrix.

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Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the cFP-DI-304 to any circuits

that may contain hazardous voltages.1

This section describes the isolation of the cFP-DI-304 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 Measurement Category II continuous

channel-to-backplane and channel-to-ground isolation, verified

by a 2,300 Vrms , 5 s dielectric withstand test.2The cFP-DI-304

provides double insulation compliant with IEC 61010-1 for

working voltages of 250 Vrms.3Safety 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

cFP-DI-304.

Even though the cFP-DI-304 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 cFP-DI-304. 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.

•Do not 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.

1 A hazardous voltage is a voltage greater than 42.4 Vpeak or 60 VDC. When a

hazardous voltage is present on any channel, all of the channels must be considered

to be carrying hazardous voltages. Ensure that all circuits connected to the module

are inaccessible to human touch.

2 Refer to the Safety Isolation Voltage section for more information about isolation on

the cFP-DI-304.

3 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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•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.

•Do not use the cFP-DI-304 as the only isolating barrier

between human contact and working voltages higher than

250 Vrms .

•Operate the cFP-DI-304 only at or below Pollution Degree 2.

Pollution Degree 2 means that only nonconductive pollution

occurs in most cases. Occasionally, however, temporary

conductivity caused by condensation must be expected.

•Operate the cFP-DI-304 at or below Measurement Category II.

Measurement Category II is for measurements performed on

circuits directly connected to the low-voltage installation.

This category refers to local-level distribution, such as that

provided by a standard wall outlet.

Safety Guidelines for Hazardous Locations

The cFP-DI-304 is suitable for use in Class I, Division 2, Groups

A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC

T4 and Ex nC IIC T4 hazardous locations; and nonhazardous

locations only. Follow these guidelines if you are installing the

cFP-DI-304 in a potentially explosive environment. Failing to

follow these guidelines may result in serious injury or death.

Caution Do not disconnect I/O-side wires or connectors

unless power has been switched off or the area is known

to be nonhazardous.

Caution Do not remove modules unless power has been

switched off or the area is known to be nonhazardous.

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Caution Substitution of components may impair

suitability for Class I, Division 2.

Caution For Zone 2 applications, install the Compact

FieldPoint system in an enclosure rated to at least IP 54

as defined by IEC 60529 and EN 60529.

Caution For Zone 2 applications, connected signals must

be within the following limits:

Capacitance .......................... 0.2 µF max

Special Conditions for Safe Use in Europe

This equipment has been evaluated as EEx nC IIC T4 equipment

under DEMKO Certificate No. 03 ATEX 0251502X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the

following precautions:

Caution Ensure that hazardous voltage wiring is

performed only by qualified personnel adhering to local

electrical standards.

Caution Do not mix hazardous voltage circuits and

human-accessible circuits on the same module.

Caution Make sure that devices and circuits connected to

the module are properly insulated from human contact.

Caution When terminals on the connector block are live

with hazardous voltages, make sure that the terminals are

not accessible.

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