INSTALLATION INSTRUCTIONS
NI TB-2633
4 × 64 1-Wire Terminal Block for the NI PXI-2533
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This document describes how to install and connect signals to the
National Instruments TB-2633 terminal block. Refer to the NI Switches
Getting Started Guide to determine when to install the NI TB-2633.
Introduction
The NI TB-2633 terminal block installs in front of the NI PXI-2533 switch
module and has screw terminals that provide access to the rows and
columns of the matrix.
1. Unpack the Terminal Block
The terminal block is shipped in an antistatic package to prevent
electrostatic discharge (ESD) that can damage several components on the
terminal block. To avoid such damage when you handle the terminal block,
take the following precautions:
Caution Never touch the exposed pins of connectors.
• Ground yourself using a grounding strap or by touching a grounded
object.
• Touch the antistatic package to a metal part of the chassis before you
remove the terminal block from the package.
Remove the terminal block from the package and inspect the terminal block
for loose components or any sign of damage. Notify NI if the terminal
block appears damaged in any way. Do not install a damaged terminal
block on a switch module.
Store the terminal block in the antistatic package when not in use.
2. Verify the Components
Make sure you have the following:
❑ NI TB-2633 terminal block
❑ PXI chassis
❑ NI PXI-2533 switch module
❑ 1/8 in. flathead screwdriver
3. Connect Signals
To connect signals to the terminal block, complete the following steps
while referring to Figure 1.
1. Loosen the terminal block top cover screw with a flathead screwdriver.
2. Gently lift the terminal block top cover off the terminal block.
3. Loosen the two screws on the strain-relief bar, leaving plenty of space
for the signal cables.
4. Pull the signal wires through the strain-relief opening shown in
Figure 1.
5. Connect the safety earth ground to the safety ground lug.
6. Connect the wires to the terminals by inserting the stripped end of the
wire into the terminal. Secure the wire by tightening the screw for each
terminal. No bare wire should extend past the screw terminal. Exposed
wire increases the risk of a short-circuit and can result in a failure.
7. Remove the slack in the terminal block wiring by pulling the wires
through the strain-relief bar.
8. Tighten the two screws on the strain-relief bar until the signal wires are
secured.
9. Replace the terminal block top cover.
10. Secure the terminal block top cover with the top cover screw.
NI TB-2633 Installation Instructions 2 ni.com
8
7
6
10
1 Strain-Relief Bar
2 Strain-Relief Opening
3 Signal Wires
4 Strain-Relief Screws
5 Jackscrews
9
5
4
5
1
4
3
2
6 Safety Ground Lug
7 Terminal Block Top Cover
8 Top Cover Screw
9 Rear Connector
10 Screw Terminals
© National Instruments Corporation 3 NI TB-2633 Installation Instructions
Figure 1. NI TB-2633 Terminal Block
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