National Instruments NI 9478 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9478

16-Channel, 0–50 V, Sinking Digital Output Module

with Programmable Current Limits

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NI 9478 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9478

and includes specifications and pin assignments for the NI 9478.

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 9478. 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 9478 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 9478 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

Ex nA IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9478 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 9478 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, install a protection

device across the external power supply and the COM

pin. The device must prevent the external power supply

voltage from exceeding 70 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 9478 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 9478 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9478

The NI 9478 has a 37-pin DSUB connector that provides

connections for the 16 digital output channels.

Figure 1. NI 9478 Pin Assignments

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

DO8

DO9

DO10

DO11

DO12

DO13

DO14

DO15

COM

Vsup

COM

Each channel of the NI 9478 has a DO pin to which youcan

connect the load youwant to control. Each channel also has a COM

pin. National Instruments recommends youprovide independent

COM wiring for each channel to minimize current flow in the

COM wiring. The COM pins are all connected together internally.

Yo umust connect an external power supply to the NI 9478. This

power supply provides the current for the devices youconnect to

the module. Connect the positive lead of the power supply to Vsup

and the negative lead of the power supply to COM.

Caution Do not remove or insert modules if the external

power supply connected to the Vsuppin is powered on.

The NI 9478 has current sinking outputs, meaning the DO pin is

driven to COM when the channel is turned on.

Yo ucan directly connect the NI 9478 to a variety of industrial

devices such as solenoids, motors, actuators, relays, and lamps.

Make sure the devices youconnect to the NI 9478 are compatible

with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.

NI 9478 Operating Instructions and Specifications 8 ni.com

Connect the device to DO and the positive lead of the power

supply. Refer to Figure 2 for an illustration of how to connect

a device to the NI 9478.

Figure 2. Connecting a Device to the NI 9478

Yo umust connect the Vsuppin to the power supply to enable a

weak cable clamping diode that protects the module from cable

inductance flyback. This flyback voltage results from small

amounts of energy stored in the inductance of the cabling. Refer

to the Using Long Cables section for more information about

protection from cable inductance flyback. Youstill must install an

external flyback diode when switching inductive loads. Refer to the

Protecting the Module from Flyback Voltages section for more

information about installing a flyback diode.

Device +

–

NI 9478

COM

Vsup

External

Power

Supply

Cable

Clamp

Protecting the Module from Flyback Voltages

If the module is switching an inductive or energy-storing device

such as a solenoid, motor, or relay, and the device does not have

flyback protection, install an external flyback diode as shown in

Figure 3. Refer to the Using Long Cables section for more

information about protection from cable inductance flyback.

Figure 3. Connecting a Flyback Diode to the NI 9478

–

NI 9478

COM

DO External

Power

Supply

Vsup

Cable

Clamp Device

NI 9478 Operating Instructions and Specifications 10 ni.com

Using Long Cables

The inductance of the cabling that connects the NI 9478, the loads,

and the external supply stores up energy when a channel is on and

passing current through the cables. Each time a channel is turned

off, the energy stored in the cables is released as flyback voltage

and dissipates as heat in the NI 9478. The total power dissipated in

the module increases with higher switching frequencies, higher

currents, and longer cable lengths. The cable length is the total

distance from the digital output pin of the NI 9478 channel,

through the load, through the external power supply, and back

to the COM pin, as shown in Figure 4.

Figure 4. Cable Length of the NI 9478

NI 9478COM

Vsup

–

External

Power

Supply

Cable

Length

Load

Cable

Clamp

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