National Instruments TBX-1328 User Manual

National Instruments TBX-1328 Manual

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TBX-1328 High-Accuracy Isothermal
Terminal Block Installation Guide

This guide describes how to install and use the TBX-1328 high-accuracy
isothermal terminal block with the SCXI-1120/D, SCXI-1121, SCXI-1125,
or SCXI-1126 modules. Table 1 shows the signals you can use with each
module.

Table 1. SCXI Module and Signal Compatibility

Module

SCXI-1120 Ye s Ye s Ye s Ye s No Ye s No No No

SCXI-1120D Ye s Ye s Ye s Ye s No No No No No

SCXI-1121 Ye s Ye s Ye s Ye s No Ye s Ye s Ye s Yes

SCXI-1125 Ye s Ye s Ye s Ye s No Ye s No No No

SCXI-1126 Ye s Ye s Ye s Ye s Ye s No No No No

Millivolts/Volts

Medium Voltage (60 V)

High Voltage

(250 V/1,000 V)

Current (4 to 20 mA)

Frequency to Voltage

Thermocouple

RTD/Thermisto r

Strain Gauge

The TBX-1328 high-accuracy isothermal terminal block is a DIN-rail
mountable, shielded terminal block with screw terminals to connect to the
SCXI-1120/D, SCXI-1121, SCXI-1125, or SCXI-1126 front connector.
The TBX-1328 has a high-precision thermistor for precise cold-junction
compensation and isothermal copper planes that minimize the temperature
gradients across the screw terminals when you take thermocouple
measurements. The TBX-1328 mounts on most European standard
DIN EN mounting rails.

The terminal block has 24 screw terminals for easy signal connection. Eight
screw terminals connect to the SCXI chassis ground through the shield of
the SH32-32-A cable. With the SCXI-1120/D, SCXI-1125, or SCXI-1126,
the remaining eight pairs of screw terminals connect signals to the eight

Force, Load, Torque

LabVIEW™, Measurement Studio™, National Instruments™, NI™, ni.com™, NI-DAQ™, and SCXI™ are trademarks of
National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of
their respective companies. For patents covering National Instruments products, refer to the appropriate location:
Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.

ni.com

© 1996–2003 National Instruments Corp. All rights reserved.

February 2003

371207A-01

SCXI module input channels. With the SCXI-1121, four pairs of screw
terminals connect signals to the four SCXI module input channels and four
pairs connect to the SCXI module excitation channels. There are eight
resistor sockets, R<0..7>, for use with the 4 to 20 mA current input.

Conventions

The following conventions are used in this guide:

<> Angle brackets that contain numbers separated by an ellipsis represent

a range of values associated with a bit or signal name—for example,
DIO<3..0>.

» The » symbol leads you through nested menu items and dialog box options

to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.

This icon denotes a note, which alerts you to important information.

bold Bold text denotes items that you must select or click on in the software,

such as menu items and dialog box options. Bold text also denotes
parameter names.

italic Italic text denotes variables, emphasis, a cross reference, or an introduction

to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.

monospace italic Italic text in this font denotes text that is a placeholder for a word or value

that you must supply.

What You Need to Get Started

To set up and use the TBX-1328, you need the following items:

❑ TBX-1328 high-accuracy isothermal terminal block

❑ TBX-1328 High-Accuracy Isothermal Terminal Block Installation

❑ Read Me First: Safety and Radio-Frequency Interference

TBX-1328 Installation Guide 2 ni.com

Guide

❑ SCXI chassis and documentation

❑ One of the following modules and its documentation:

– SCXI-1120/D

– SCXI-1121

– SCXI-1125

– SCXI-1126

❑ SH32-32-A shielded cable assembly that includes the TBX cable

adapter

❑ 3/16 in. wrench

❑ Numbers 1 and 2 Phillips screwdrivers

❑ 1/8 in. flathead screwdriver

❑ Long-nose pliers

❑ Wire cutter

❑ Wire insulation stripper

Note You can download any NI document from ni.com/manuals.

Connecting the Signals

Note Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting or disconnecting any signal wires.

To connect the field signals to the TBX-1328 for use with the SCXI-1120
or SCXI-1121, follow the labeling on the TBX-1328 indicated along with
the appropriate SCXI module type column as shown in Figure 1. For the
SCXI-1120D, SCXI-1125, and SCXI-1126 modules, use the SCXI-1120
label.

To connect the signals, complete the following steps, referring to Figures 1
through 3 as necessary:

1. Remove the TBX-1328 terminal block cover by unscrewing the four
captive cover screws in the cover corners. These screws stay attached
to the cover without falling out.

2. Connect the signal wires to the screw terminals. Refer to the SCXI

© National Instruments Corporation 3 TBX-1328 Installation Guide

module user manual for examples of how to connect to field signals
and loads. The chassis ground terminals are connected to the SCXI

chassis through the cable shield. This connection is not shown in the
SCXI module user manual. Allow the signal wires to exit through the
TBX-1328 cover opening.

Notes When using the SCXI-1121 module to measure current, you must populate

R<0...7>, which corresponds to CH<0...7>. Since the SCXI-1121 can measure a maximum
current of 20 mA, the minimum usable resistor value is R = 10 V ÷ 20 mA = 500 Ω.

This terminal block does not provide strain relief for field signal wires. Add strain relief,
insulation, and padding for the wires, if necessary.

3. Replace the TBX-1328 terminal block cover and tighten the captive
cover screws.

The signal connection is now complete.

4 5 6

3

HIGH VOLTAGE

1

C

2

1

1 Cover Mounting Nut
2 Chassis Ground Screw Terminals
3 Backshell Mounting Kit
4 Cable Connector
5 Assembly Number

250 V CAT II MAX CHANNEL-TO-CHANNEL
250 V CAT II MAX CHANNEL-TO-EARTH

6 Serial Number
7 Current–Receiver Resistor Sockets

R<0..7> = Channel<0..7>
8 Signal Wire Screw Terminals
9 Product Name

3

1

7

8

2

9

1

TBX-1328 Installation Guide 4 ni.com

Figure 1. TBX-1328 Terminal Block Parts Locator Diagram

Installing the Terminal Block and Cable Assembly

After completing the Connecting the Signals section, you can install the
terminal block. Complete the following steps to mount the SH32-32-A
cable assembly and connect the TBX-1328 to the SCXI module while
referring to Figures 2 through 4 as needed.

1. Power off the SCXI chassis.

2. Power off the computer that contains the E Series data acquisition
(DAQ) device or disconnect the device from the SCXI chassis.

3. Connect the TBX cable adapter to the appropriate SCXI module and
secure it by tightening both thumb screws.

4

3

2

1

1 M 2.5 Mounting Screws
2 Cable Assembly
3 Thumb Screws

5
4
3
2
1

ADDRESS

5

3

4 SCXI Chassis
5 TBX Cable Adapter

Figure 2. Connecting the SH32-32-A Cable to the SCXI Module

© National Instruments Corporation 5 TBX-1328 Installation Guide