National Instruments NI 9425 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9425

32-Channel, 24 V Sinking Digital Input Module

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NI 9425 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9425

and includes specifications and pin assignments for the NI 9425.

Visit ni.com/info and enter rdsoftwareversion to determine

which software youneed for the modules youare using. For

information about installing, configuring, and programming the

system, refer to the system documentation. Visit ni.com/info

and enter cseriesdoc for information about C Series

documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9425. The other

components in the system might not meet the same safety

ratings and specifications. Refer to the documentation for

each component in the system to determine the safety

ratings and specifications for the entire system. Visit

ni.com/info and enter cseriesdoc for information

about C Series documentation.

Safety Guidelines

Operate the NI 9425 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the

following precautions. A hazardous voltage is a voltage greater

than 42.4 Vpk or 60 VDC to earth ground.

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.

NI 9425 Operating Instructions and Specifications 4 ni.com

Caution When module terminals are hazardous voltage

LIVE (>42.4 Vpk/60 VDC), youmust ensure that devices

and circuits connected to the module are properly

insulated from human contact.

Safety Guidelines for Hazardous Locations

The NI 9425 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 youare installing the NI 9425 in a

potentially explosive environment. Not following 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.

Caution Substitution of components may impair

suitability for Class I, Division 2.

Caution For Zone 2 applications, install the 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 limit:

Capacitance .......................... 0.03 μF max

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as EEx nC IIC T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. Each module

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

locations. If youare using the NI 9425 in Gas Group IIC hazardous

locations or in ambient temperatures of –40 °C ≤Ta ≤70 °C, you

must use the device in an NI chassis that has been evaluated as

EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

NI 9425 Operating Instructions and Specifications 6 ni.com

Special Conditions for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for

marine applications. To verify Lloyd’s Register certification, visit

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission requirements

for marine applications, use shielded cables and install

the system in a metal enclosure. Suppression ferrites

must be installed on power supply inputs near power

entries to modules and controllers. Power supply and

module cables must be separated on opposite sides of the

enclosure and must enter and exit through opposing

enclosure walls.

Connecting the NI 9425

The NI 9425 has a 37-pin DSUB connector that provides

connections for 32 simultaneously-sampled digital input channels.

Figure 1. NI 9425 Pin Assignments

DI16

DI17

DI18

DI19

DI20

DI21

DI22

DI23

COM

DI24

DI25

DI26

DI27

DI28

DI29

DI30

DI31

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

COM

DI8

DI9

DI10

DI11

DI12

DI13

DI14

DI15

NI 9425 Operating Instructions and Specifications 8 ni.com

Each channel has a DI pin to which youcan connect a digital input

signal. The NI 9425 has four common pins, COM, that are

internally connected to the isolated reference of the module.

The NI 9425 has sinking inputs, meaning that when the device

drives a current or applies a voltage to the DI pin, the pin provides

a path to COM for the current or voltage. The NI 9425 internally

limits current signals connected to DI. For more information about

input current levels, refer to the Specifications section.

Yo ucan connect 2-, 3-, and 4-wire sourcing-outputdevices to

the NI 9425. A sourcing-output device drives current or applies

voltage to the DI pin. An example of a sourcing-output device is an

open collector PNP.

Connect the sourcing-output device to the DI pin on the NI 9425.

Connect the common of the external device to the COM pin. Refer

to Figure 2 for an illustration of connecting a device to the

NI 9425.

Figure 2. Connecting a Device to the NI 9425 (Three-Wire Device Shown)

The NI 9425 channel registers as ON when the sourcing-output

device applies a voltage or drives a current that is in the input ON

range to the DI pin. The channel registers as OFF when the device

applies a voltage or drives a current that is in the input OFF range

to the DI pin. If no device is connected to the DI pin, the channel

registers as OFF. Refer to the Specifications section for more

information about the ON and OFF states.

NI 9425

_COM

Sourcing-Output

Device

External

Power

Supply

NI 9425 Operating Instructions and Specifications 10 ni.com

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Typically, when a system is in sleep mode, youcannot

communicate with the modules. In sleep mode, the system

consumes minimal power and may dissipate less heat than it does

in normal mode. Refer to the Specifications section for more

information about power consumption and thermal dissipation.

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