National Instruments NI 9426 Bedienungsanleitung

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9426

32-Channel, 24 V, Sourcing Digital Input Module

ni.com/manuals

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NI 9426 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9426

and includes specifications and pin assignments for the NI 9426.

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 9426. 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.

Safety Guidelines

Operate the NI 9426 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.

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 9426 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and

NI 9426 Operating Instructions and Specifications 4 ni.com

Ex nA IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9426 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, install a protection

device that prevents the Vsupvoltage from exceeding

42 V if there is a transient overvoltage condition.

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex nA IIC T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. Each module

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

locations. If youare using the NI 9426 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.

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.

NI 9426 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9426

The NI 9426 has a 37-pin DSUB connector that provides

connections for 32 simultaneously-sampled digital input channels.

Figure 1. NI 9426 Pin Assignments

DI16

DI17

DI18

DI19

DI20

DI21

DI22

DI23

Vsup

DI24

DI25

DI26

DI27

DI28

DI29

DI30

DI31

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

Vsup

DI8

DI9

DI10

DI11

DI12

DI13

DI14

DI15

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

signal. The NI 9426 has four supply pins, Vsup, that are internally

connected to the isolated reference of the module.

The NI 9426 has sourcing inputs, meaning the DI pin sources

current from Vsupto the sinking output device. The NI 9426

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 sinking-outputdevices to

the NI 9426. A sinking-output device provides a path from the

DI pin to a voltage below Vsup. An example of a sinking-output

device is an open collector NPN.

Connect the sinking-output device to the DI pin of the NI 9426.

Connect the positive power supply lead of the external device to the

Vsuppin. Refer to Figure 2 for an illustration of connecting a device

to the NI 9426.

NI 9426 Operating Instructions and Specifications 8 ni.com

Figure 2. Connecting a Device to the NI 9426 (Three-Wire Device Shown)

The NI 9426 channel registers as ON when the sinking-output

device drives the input below Vsupand meets the input ON range.

The channel registers as OFF when the device does not drive the

input low and is in the input OFF range. 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 9426

_DI

Vsup

Sinking-Output

Device

External

Power

Supply

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.

Specifications

The following specifications are typical for the range –40 to 70 °C

unless otherwise noted. All voltages are relative to Vsupunless

otherwise noted.

Input Characteristics

Number of channels.......................... 32 digital input channels

NI 9426 Operating Instructions and Specifications 10 ni.com

Input type .......................................... Sourcing

Digital logic levels

OFF state

Input voltage1....................... ≥ (Vsup – 5 V)

Input current......................... ≤150 μA from DI pin

ON state

Input voltage1....................... ≤ (Vsup – 10 V)

Input current......................... ≥ 330 μA from DI pin

Hysteresis

Input voltage ........................ 1.9 V min

Input current......................... 65 μA min

Input impedance................................ 30 kΩ ±5%

I/O protection (Vsup-to-channel)

Input voltage............................... 30 V max

Reverse-biased voltage............... –30 V max

1 Vsupis the external power supply voltage.

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