National Instruments NI TB-2642 Bedienungsanleitung

INSTALLATION INSTRUCTIONS

NI TB-2642

16 × 32 1-Wire Matrix Terminal Block for the NI PXI-2532

Introduction

The NI TB-2642 terminal block configures the NI PXI-2532 switch

module as a 16 ×32 1-wire matrix. The NI TB-2642 has ribbon cable

headers to connect signals to the switch, and it provides optional isolation

resistors to protect the reed relay from capacitive loads.

Refer to the NI Switches Getting Started Guide to determine when to install

the terminal block.

Make sure you have the following:

• NI TB-2642 terminal block

• 1/8 in. flathead and #1 Phillips screwdrivers

• One 34 conductor, 28 AWG, .050 in. pitch ribbon cable assembly

(not included)

• One 16 conductor, 28 AWG, .050 in. pitch ribbon cable assembly

(not included)

Note Refer to the Accessories section for information about ordering the appropriate cable

assemblies.

Connecting Ribbon Cables

To connect ribbon cables to the terminal block, refer to Figures 1 and 2

while completing the following steps:

1. Remove the top cover screw.

2. Gently remove the top cover from the terminal block.

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NI TB-2642 Installation Instructions 2 ni.com

3. Loosen the two screws on the strain-relief assembly and remove the

strain-relief bar.

4. Remove the two screws from the column connection board and retain

the plastic spacer.

5. Disconnect the column connection board from the module interface

board by sliding it toward the front of the terminal block housing.

6. Connect each ribbon cable to the appropriate headers on the column

connection board and the module interface board.

7. Reassemble the terminal block.

Note For information about protection resistance and matrix expansion, refer to the

NI Switches Help.

Figure 1. NI TB-2642 Terminal Block

1 Top Cover Screw

2 Top Cover

3 Strain-relief Screws

4 Strain-relief Bar

5 Column Connection Board Screws

6 Column Connection Board

7 Module Interface Board

8 Column Header

9 Row Headers

10 Housing

©National Instruments Corporation 3 NI TB-2642 Installation Instructions

Figure 2. NI TB-2642 Terminal Block Signal Connections

Accessories

Note For information about using shielded cabling, refer to the NI PXI-2532 Declaration

of Conformity (DoC). To obtain the DoC, visit ni.com/certification, search by

model number or product line, and click the appropriate link in the Certification column.

Table 1. Accessories for the NI TB-2642

Accessory Manufacturer Part Number

NI SCB-264X screw terminal block National Instruments 779341-01

Row and column cable kit for the

NI SCB-264Xterminal blocks

National Instruments 779346-01

Row connection cable for column expansion National Instruments 779325-01

16 Conductor, .05 in. pitch ribbon cable

assemblies

Samtec FFSD-08-01-N

34 Conductor, .05 in. pitch ribbon cable

assemblies

Samtec FFSD-17-01-N

0 (Pin 1)

COLUMN

CONNECTION BOARD

J2 J3 J2

(not used)

ROW

HEADERS

910

13 12

0 (Pin 1)

910

13 12

1415

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ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are

trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate

location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents.

Specifications

This section lists additional specifications for the NI TB-2642 when used

with the NI PXI-2532. All specifications are subject to change without

notice. Visit ni.com/manuals for the most current specifications.

Input Characteristics

All input characteristics are DC, ACpk, or a combination unless otherwise

specified.

Maximum switching voltage

Channel-to-channel..........................100 V

Channel-to-ground...........................100 V, CAT I

Caution This module is rated for Measurement Category I and intended to carry

signal voltages no greater than 100 V. This module can withstand up to 500 V impulse

voltage. Do not use this module for connections to signals or for measurements within

Categories II, III, or IV. Do not connect to MAINs supply circuits (for example, wall

outlets) of 115 or 230 VAC. Refer to the Read Me First: Safety and Electromagnetic

Compatibility document for more information on measurement categories.

When hazardous voltages (>42.4 Vpk/60 VDC) are present on any relay terminal, safety

low-voltage (<42.4 Vpk/60 VDC) cannot be connected to any other relay terminal.

Maximum current (per channel) .............0.5 A

DC path resistance ..................................<1.5 Ω

Column protection

resistors (when used) .............................100 Ω

Bandwidth (–3 dB, 50 Ωtermination)

Typical.............................................≥15 MHz

Crosstalk (50 Ωtermination)

Channel-to-channel

10 kHz ......................................<–75 dB

100 kHz ....................................<–60 dB

1 MHz.......................................<–40 dB

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