National Instruments NI 9401 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9401

8-Channel, TTL Digital Input/Output Module

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This document describes how to use the National Instruments 9401 and includes specifications and pin assignments for the NI 9401. Vis it ni.com/info and enter rdsoftwareversion to determine which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation. Visit and enter

cseriesdoc for information about C Series

ni.com/info

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.

NI 9401 Operating Instructions and Specifications 2 ni.com

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, T 4 ha zar dous 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.

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 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.

NI 9401 Operating Instructions and Specifications 4 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 9401

The NI 9401 has a 25-pin DSUB connector that provides connections for eight digital input/output channels.

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

DIO6

DIO7

Figure 1. NI 9401 Pin Assignments

NI 9401 Operating Instructions and Specifications 6 ni.com

COM

Each channel has a DIO pin to which you can connect a digital input or output device. The eight DIO channels are internally referenced to COM, so you can 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 u can 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.

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.

SCLK

MOSI

MISO

SPI Device

Figure 2. Connecting an SPI Device to the NI 9401

NI 9401 Operating Instructions and Specifications 8 ni.com

DIO3:0

Configured

for Output

DIO7:4

Configured

for Input

NI 9401

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