National Instruments TBX-1328 Manual de usuario

National Instruments TBX-1328 Manual

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February 2003

371207A-01

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.

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

Table 1. SCXI Module and Signal Compatibility

Module

Millivolts/Volts

Medium Voltage (60 V)

High Voltage

(250 V/1,000 V)

Current (4 to 20 mA)

Frequency to Voltage

Thermocouple

RTD/Thermistor

Strain Gauge

Force, Load, Torque

SCXI-1120 Yes Yes Yes Yes No Yes No No No

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

SCXI-1121 Yes Yes Yes Yes No Yes Yes Yes Yes

SCXI-1125 Yes Yes Yes Yes No Yes No No No

SCXI-1126 Yes Yes Yes Yes Yes No No No No

ni.com

TBX-1328 Installation Guide 2 ni.com

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

Guide

❑Read Me First: Safety and Radio-Frequency Interference

©National Instruments Corporation 3 TBX-1328 Installation 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

module user manual for examples of how to connect to field signals

and loads. The chassis ground terminals are connected to the SCXI

TBX-1328 Installation Guide 4 ni.com

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.

Figure 1. TBX-1328 Terminal Block Parts Locator Diagram

1 Cover Mounting Nut

2 Chassis Ground Screw Terminals

3 Backshell Mounting Kit

4 Cable Connector

5 Assembly Number

6 Serial Number

7 Current–Receiver Resistor Sockets

R<0..7> = Channel<0..7>

8 Signal Wire Screw Terminals

9 Product Name

250 V CAT II MAX CHANNEL-TO-CHANNEL

250 V CAT II MAX CHANNEL-TO-EARTH

HIGH VOLTAGE

4 5 6

©National Instruments Corporation 5 TBX-1328 Installation Guide

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.

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

1 M 2.5 Mounting Screws

2 Cable Assembly

3 Thumb Screws

4 SCXI Chassis

5 TBX Cable Adapter

ADDRESS

TBX-1328 Installation Guide 6 ni.com

4. Verify that the four backshell mounting ears on the cable assembly are

in the position shown in Figure 3. If not, remove the backshell

mounting ears and install them in the position shown.

Figure 3. Connecting the SH32-32-A Cable to the TBX-1328 Terminal Block

5. Connect one end of the cable assembly to the SCXI module front

connector and secure the SH32-32-A cable by tightening both

backshell mounting screws.

6. Connect the other end of the cable assembly to the TBX-1328 terminal

block connector and secure the SH32-32-A cable by tightening both

backshell mounting screws.

7. Reconnect the E Series DAQ device to the SCXI chassis.

1 Backshell Mounting Screws and Ears

2 Safety Ground Lugs

3 Captive Cover Screws

4 Terminal Block Connector

5 Signal Wire Entry

©National Instruments Corporation 7 TBX-1328 Installation Guide

Figure 4. The Completed Installation

Rack Mounting

When you have completed the Installing the Terminal Block and Cable

Assembly section, you can mount the TBX assembly in the rack. If you are

using the National Instruments TBX Rack-Mount Assembly, refer to the

TBX Rack-Mount Installation Guide for instructions.

If you are not using this rack-mount assembly, complete the following steps

to mount the TBX assembly directly onto the DIN rail:

1. Snap the TBX terminal block onto the DIN rail with a firm push.

2. Install the SCXI chassis using the appropriate chassis rack-mount kit.

Note To remove the TBX terminal block from the DIN rail, place a flathead screwdriver

into the slot above the terminal block base and pry it from the rail.

ADDRESS

TBX-1328 Installation Guide 8 ni.com

Specifications

All specifications are typical at 25 °C unless otherwise specified.

Electrical

Compatible modules

SCXI-1120/D...................................8 input channels

SCXI-1121.......................................4 input channels,

4 excitation output channels

SCXI-1125.......................................8 input channels

SCXI-1126.......................................8 input channels

Cold-junction temperature-sensor circuitry

Sensor type ......................................Thermistor

Output range ....................................1.91 to 0.65 VDC from 0 to 50 °C

Accuracy1........................................±0.5 °C from 15 to 35 °C

±0.9 °C from 0 to 15 °C

and 35 to 50 °C

Repeatability....................................±0.2 °C from 15 to 35 °C

Coupling .................................................DC2

Current-receiver resistors........................Resistors not included

Resistor sockets are provided

for each channel

Field-wiring connectors

Signal screw terminals.....................16 screw terminals (8 pairs)

Functional earth ground...................8 screw terminals

Terminal spacing .............................0.5 cm (0.2 in.)

center-to-center

Maximum wire gauge......................16 AWG

Strain relief ......................................none

Dimensions of front entrance .................1.2 by 7.3 cm

(0.47 by 2.87 in.)

1 This specification includes the accuracy of the temperature-sensor circuitry itself and the temperature difference between the

thermistor and any screw terminal. The temperature-sensor circuitry accuracy includes manufacturing tolerances in all

component values, effects caused by component-value temperature drift, voltage-divider loading, and thermistor self-heating.

2 In instrumentation terminology, DC coupling means that both DC and AC signals are passed.

©National Instruments Corporation 9 TBX-1328 Installation Guide

Mechanical

Dimensions............................................. 12.7 by 7.62 by 11.16 cm

(5.0 by 3.0 by 4.4 in.)

Weight.................................................... 100 g (3.5 oz)

Compatible DIN rails............................. DIN EN 50 022

DIN EN 50 035

Isothermal construction (with cover attached)

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the

common-mode voltage.

Channel-to-earth..................................... Each channel must remain within

250 Vrms or ±250 VDC of ground,

Installation Category II

Channel-to-channel ................................ Each channel must remain within

250 Vrms or ±250 VDC of the

voltage applied to any other

channel, Installation Category II

Environmental

Operating temperature............................ 0 to 50 °C

Storage temperature ............................... –20 to 70 °C

Humidity ................................................ 10 to 90% RH, noncondensing

Maximum altitude .................................. 2,000 m

Pollution Degree (indoor use only)........ 2

Safety

The TBX-1328 is designed to meet the requirements of the following

standards of safety for electrical equipment for measurement, control and

laboratory use:

• IEC 61010-1, EN 61010-1

• UL 3111-1, UL61010B-1

• CAN/CSA C22.2 No. 1010.1

Note For UL and other safety certifications refer to the product label or to ni.com.

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