National Instruments NI 9401 User manual

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9401

8-Channel, TTL Digital Input/Output Module

ni.com/manuals

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2|ni.com |NI 9401 Operating Instructions and Specifications

This document describes how to use the National Instruments 9401

and includes specifications and terminal assignments for the

NI 9401. For information about installing, configuring, and

programming the system, refer to the system documentation. Visit

ni.com/info and enter the following Info Codes:

•cseriesdoc—for information about C Series and system

documentation.

•compatibility—for information about chassis and carrier

compatibility for the modules you are using.

•rdsoftwareversion—for information about which software

you need for the modules you are using.

Note The safety guidelines and specifications in this

document are specific to the NI 9401. 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.

NI 9401 Operating Instructions and Specifications |© National Instruments |3

Safety Guidelines

Operate the NI 9401 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.

Caution Do not operate the NI 9401 in a manner not

specified in these operating instructions. Product misuse

can result in a hazard. You can compromise the safety

protection built into the product if the product is damaged

in any way. If the product is damaged, return it to National

Instruments for repair.

Safety Guidelines for Hazardous Locations

The NI 9401 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 NI 9401 in a

potentially explosive environment. Not following these guidelines

may result in serious injury or death.

4|ni.com |NI 9401 Operating Instructions and Specifications

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 Division 2 and 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 Division 2 and Zone 2 applications,

connected signals must be within the following limit:

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

NI 9401 Operating Instructions and Specifications |© National Instruments |5

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 you are using the NI 9401 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.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory

requirements and limits for electromagnetic compatibility (EMC)

as stated in the product specifications. These requirements and

limits are designed to provide reasonable protection against

harmful interference when the product is operated in its intended

operational electromagnetic environment.

This product is intended for use in industrial locations. There is no

guarantee that harmful interference will not occur in a particular

installation, when the product is connected to a test object, or if the

product is used in residential areas. To minimize the potential for

6|ni.com |NI 9401 Operating Instructions and Specifications

the product to cause interference to radio and television reception

or to experience unacceptable performance degradation, install and

use this product in strict accordance with the instructions in the

product documentation.

Furthermore, any changes or modifications to the product not

expressly approved by National Instruments could void your

authority to operate it under your local regulatory rules.

Caution To ensure the specified EMC performance,

operate this product only with shielded cables and

accessories.

Caution To ensure the specified EMC performance, you

must install a clamp-on ferrite bead (National

Instruments part number 711627-01) in accordance with

the product installation instructions. Refer to the NI 9401

product page on ni.com for purchasing information

about clamp-on ferrite beads.

NI 9401 Operating Instructions and Specifications |© National Instruments |7

Cable Requirements for EMC Compliance

Select and install cables for the NI 9401 in accordance with the

following requirements:

• Install a clamp-on ferrite bead (National Instruments part

number 711627-01) on cable that you are connecting to NI 9401.

• The clamp-on ferrite bead must be connected to the cable as

close to the module as possible. Placing the ferrite elsewhere

on the cable noticeably impairs its effectiveness.

Figure 1. Installing a Ferrite Bead

1 Installing a ferrite bead on a 25-pin DSUB cable.

2 Installing a ferrite bead on the cable of the NI 9924 terminal block.

1 2

8|ni.com |NI 9401 Operating Instructions and Specifications

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 9401 Operating Instructions and Specifications |© National Instruments |9

Connecting the NI 9401

The NI 9401 has a 25-pin DSUB connector that provides

connections for eight digital input/output channels.

Figure 2. NI 9401 Pin Assignments

COM

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

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