National Instruments NI 9425E Manuale utente

NI-9425

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9425E

32-Channel, 24 V Sinking Digital Input Module

2|ni.com |NI 9425E Operating Instructions and Specifications

This document describes how to use the National

Instruments 9425E and includes dimensions, connector

assignments, and specifications for the NI 9425E. Visit 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 ni.com/info and enter

cseriesdoc for information about C Series documentation.

Caution National Instruments makes no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9425E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9425E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

Caution Do not operate the NI 9425E 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.

NI 9425E Operating Instructions and Specifications |© National Instruments |3

NI 9425E Dimensions

The following figure shows the dimensions of the NI 9425E.

Figure 1. NI 9425E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

4|ni.com |NI 9425E Operating Instructions and Specifications

Connecting the NI 9425E

The NI 9425E has a 37-pin DSUB connector that provides

connections for 32 simultaneously-sampled digital input channels.

Figure 2. NI 9425E Pin Assignments

DI16

DI17

DI18

DI19

DI20

DI21

DI22

DI23

COM

DI24

DI25

DI26

DI27

DI28

DI29

DI30

DI31

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

COM

DI8

DI9

DI10

DI11

DI12

DI13

DI14

DI15

NI 9425E Operating Instructions and Specifications |© National Instruments |5

Each channel has a DI pin to which you can connect a digital input

signal. The NI 9425E has four common pins, COM, that are

internally connected to the isolated reference of the module.

The NI 9425E has sinking inputs, meaning that when the device

drives a current or applies a voltage to the DI pin, the pin provides

a path to COM for the current or voltage. The NI 9425E internally

limits current signals connected to DI. For more information about

input current levels, refer to the Specifications section.

You can connect 2-, 3-, and 4-wire sourcing-output devices to

the NI 9425E. A sourcing-output device drives current or applies

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

open collector PNP.

6|ni.com |NI 9425E Operating Instructions and Specifications

Connect the sourcing-output device to the DI pin on the NI 9425E.

Connect the common of the external device to the COM pin. Refer

to Figure 3 for an illustration of connecting a device to the

NI 9425E.

Figure 3. Connecting a Device to the NI 9425E

(Three-Wire Device Shown)

The NI 9425E channel registers as ON when the sourcing-output

device applies a voltage or drives a current that is in the input ON

range to the DI pin. The channel registers as OFF when the device

applies a voltage or drives a current that is in the input OFF range

to the DI pin. If no device is connected to the DI pin, the channel

NI 9425

_COM

Sourcing-Output

Device

External

Power

Supply

NI 9425E Operating Instructions and Specifications |© National Instruments |7

registers as OFF. Refer to the Specifications section for more

information about the ON and OFF states.

Caution To ensure a grounded connection, use shielded

I/O cables and tie the shield to the chassis ground.

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Typically, when a system is in sleep mode, you cannot

communicate with the modules. In sleep mode, the system

consumes minimal power and may dissipate less heat than it does

in normal mode. Refer to the Specifications section for more

information about power consumption and thermal dissipation.

8|ni.com |NI 9425E Operating Instructions and Specifications

Specifications

The following specifications are typical for the range -40 to 70 °C

unless otherwise noted. All voltages are relative to COM unless

otherwise noted.

Input Characteristics

Number of channels.......................... 32 digital input channels

Input type.......................................... Sinking

Digital logic levels

OFF state

Input voltage ........................ ≤5 V

Input current......................... ≤150 μA

ON state

Input voltage ........................ ≥10 V

Input current......................... ≥330 μA

Hysteresis

Input voltage ........................ 2 V min

Input current......................... 60 μA min

Input impedance................................ 30 kΩ± 5%

NI 9425E Operating Instructions and Specifications |© National Instruments |9

I/O protection

Input voltage

8 channels ............................ 60 VDC max

32 channels .......................... 30 VDC max

Reverse-biased voltage

8 channels ............................ -60 VDC max

32 channels .......................... -30 VDC max

Hold time1......................................... 0 μs min

Setup time2........................................ 1 μs min

Update/transfer time ......................... 7 μs max

MTBF ............................................... 1,256,699 hours at 25 °C;

Bellcore Issue 2, Method 1,

Case 3, Limited Part Stress

Method

1 Hold time is the amount of time input signals must be stable after initiating a read

from the module.

2 Setup time is the amount of time input signals must be stable before reading from the

module.

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