National Instruments NI 9401 Manuale utente

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9401

8-Channel, TTL Digital Input/Output Module

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NI 9401 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9401

and includes specifications and pin assignments for the NI 9401.

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 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.

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.

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 youare installing the NI 9401 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.

NI 9401 Operating Instructions and Specifications 4 ni.com

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 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 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.

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 6 ni.com

Connecting the NI 9401

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

connections for eight digital input/output channels.

Figure 1. NI 9401 Pin Assignments

COM

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

Each channel has a DIO pin to which youcan connect a digital

input or output device. The eight DIO channels are internally

referenced to COM, so youcan use any of the nine COM lines as

a reference for the external signal.

The DIO channels are grouped in two ports, one containing

channels 0, 1, 2, and 3, and one containing channels 4, 5, 6, and 7.

Yo ucan independently configure each digital port in software for

input or output. Note that all four channels in the port must share

the same line direction. Refer to the software help for information

about configuring ports on the NI 9401.

Each channel also has a pull-down resistor and includes

overvoltage, overcurrent, and short-circuit protection. Refer to the

Specifications section for more information about input thresholds

and overvoltage protection. Refer to the Overcurrent Protection

section for more information about overcurrent protection.

NI 9401 Operating Instructions and Specifications 8 ni.com

Figure 2 illustrates how to connect an SPI device to the NI 9401.

In this example, the three channels assigned to output signals are

on one port and the channel assigned to an input signal is on the

other port.

Figure 2. Connecting an SPI Device to the NI 9401

NI 9401

DIO3:0

Configured

for Output

DIO7:4

Configured

for Input

SCLK

MOSI

MISO

SPI Device

Figure 3 illustrates how to connect several types of digital devices

to the NI 9401.

Figure 3. Connecting Digital Devices to the NI 9401

TTL Signal

+5 V

LED

DIO0 as Input

DIO1 as Input

COM

DIO7 as Output

NI 9401

Dev 3

Dev 2

Dev 1

NI 9401 Operating Instructions and Specifications 10 ni.com

Overcurrent Protection

Overcurrent protection on the NI 9401 allows only a specified

amount of current for switching DIO channels or sourcing the

output load. If the NI 9401 goes into an overcurrent state, by

exceeding the specified maximum switching frequency or the

output load, the module power supply begins to drop in voltage

until it completely turns off or the overcurrent condition is

removed. When the module is in this state, it can accept new line

direction configuration and output state data but cannot pass valid

input data to the software. Refer to the Specifications section for

more information about the maximum switching frequency and

output load for each channel.

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