National Instruments NI 9423 User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9421/9423

8-Channel Sinking Digital Input Modules

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NI 9421/9423 2 ni.com

This document describes how to use the National Instruments 9421

and National Instruments 9423 and includes specifications and

terminal assignments for the NI 9421/9423. In this document, the

NI 9421 with screw terminal, NI 9421 with DSUB, and NI 9423

are referred to inclusively as the NI 9421/9423. 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 9421/9423. 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 9421/9423 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

Yo ucan connect hazardous voltages to the NI 9421/9423 with

screw terminal only. Do not connect hazardous voltages to the

NI 9421 with DSUB.

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.

NI 9421/9423 4 ni.com

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. Youmust use the NI 9932

connector backshell kit to ensure that the terminals are

not accessible.

Figure 1 shows the NI 9932 connector backshell.

Note Yo ucan use the NI 9932 connector backshell only

with the NI 9421/9423 with screw terminal.

Figure 1. NI 9932 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9421/9423 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 9421/9423 in a potentially explosive environment.

Not following these guidelines may result in serious injury or

death.

NI 9421/9423 6 ni.com

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.......................... 0.2 μF max

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex 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, in ambient temperatures of –40 °C ≤Ta ≤70 °C. If you

are using the NI 9421/9423 in Gas Group IIC hazardous locations,

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

Ex nC IIC T4, 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 9421/9423 8 ni.com

Connecting the NI 9421/9423

The NI 9421/9423 provides connections for eight digital input

channels.

Figure 2. NI 9421/9423 Terminal and Pin Assignments

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

COM

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

The NI 9421/9423 with screw terminal has a 10-terminal,

detachable screw-terminal connector. The NI 9421 with DSUB has

a 25-pin DSUB connector.

Each channel of the NI 9421/9423 has a DI terminal or pin to which

youcan connect voltage or current signals. The NI 9421/9423 also

has COM, a common terminal or pin that is internally connected to

the isolated ground reference of the module.

Note Yo umust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9421/9423 with screw terminal.

The NI 9421/9423 has sinking inputs, meaning that when the

external device drives current or applies voltage to the DI terminal

or pin, DI provides a path to COM for the current or voltage. The

NI 9421/9423 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-output devices to the

NI 9421/9423. A sourcing-output device drives current or applies

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

collector PNP.

NI 9421/9423 10 ni.com

Connect the output of the sourcing-output device to DI on the

NI 9421/9423. Connect the common of the external device to the

COM terminal or pin. Refer to Figure 3 for an illustration of

connecting a device to the NI 9421/9423.

Figure 3. Connecting a Device to the NI 9421/9423 (3-Wire Device Shown)

NI 9421/9423

–

Sourcing-Output

Device

COM

External

Power

Supply

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