NI TBX-2808 User manual

INSTALLATION INSTRUCTIONS
NI TBX-2808
Screw Terminal Accessory for the NI SwitchBlock
This installation guide describes how to install and connect signals to the NI TBX-2808 screw
terminal accessory for use with NI SwitchBlock cards.
The NI TBX-2808 is an unshielded, DIN-rail mountable terminal breakout block that consists
of a printed circuit board with screw terminals that provide connections to all channels of a
single NI SwitchBlock card. The NI TBX-2808 includes a safety interlock resistor to engage the
NI SwitchBlock card’s safety relays, allowing connections to the NI SwitchBlock analog bus.
Specifications
Maximum voltage............................................. 100 V, CAT I
(row/column-to-ground)
Maximum current (per screw terminal) ............ 2 A
Maximum current (per terminal block) ............ 64 A
Caution This product is rated for Measurement Category I. Do not use this product
for connection to signals or for measurements within Categories II, III, or IV.
Caution The maximum voltage is limited to the lowest voltage of any component in
the NI SwitchBlock system. Review the specifications of the NI SwitchBlock carrier
and cards.
Caution The NI TBX-2808 must be installed inside a suitably rated enclosure with
proper cable/wire strain relief(s) prior to use. There are no user serviceable parts
inside. Do not change or alter this product in any way.
Caution NI products typically must be operated with shielded cables and accessories
to ensure compliance with Electromagnetic Compatibility (EMC) requirements. To
determine if shielded cables or accessories are required for the product that the
NI TBX-2808 will be used with, refer to the EMC specifications in the product’s user
guide or manual. If shielded cables or accessories are required for EMC compliance,
do not use unshielded cables or accessories unless they are installed in a shielded
enclosure with properly designed and shielded input/output ports, and are connected
to the NI product using a shielded cable. If unshielded cables or accessories are not
properly installed and shielded, the EMC specifications for the product are no longer
guaranteed.

NI TBX-2808 Installation Instructions 2 ni.com
Caution The protection provided by this product may be impaired if it is used in a
manner not described in this document.
Compatible DIN rails........................................DIN EN 50 022
DIN EN 50 035
Dimensions (L ×W ×H) ..................................19.8 ×12.8 ×8.5 cm
(7.8 ×5.0 ×3.4 in.)
Weight ...............................................................398 g (14 oz)
What You Need to Get Started
You need the following items to set up and use your screw terminal accessory:
❑One NI SwitchBlock card and specifications
❑NI TBX-2808 screw terminal accessory
❑SH160F-160M-NI SwitchBlock cable
❑1/10 in. (2.5 mm) flathead screwdriver
❑#1 Phillips-head screwdriver
❑Wire cutters
❑Wire insulation strippers
Signal Connection
Refer to Figure 1 and perform the following steps to connect your signals to your screw terminal
accessory:
1. Unscrew the four cover screws with a Phillips-head screwdriver to remove the cover.
2. Use wire cutters and wire insulation strippers to strip the wire ends as necessary to connect
them to screw terminals.
3. Loosen the screws in the screw terminals with a 1/10 in. (2.5 mm) flathead screwdriver.
4. Insert the stripped wires into the screw terminals, and tighten the screws with a 1/10 in.
(2.5 mm) flathead screwdriver.
5. Allow the signal wires to exit through the cover opening.
Note The NI TBX-2808 screw terminal accessory does not provide strain relief for
signal wires. Add strain relief and insulation for your signal wires, if necessary.
6. Replace the cover and tighten the cover screws.
7. If using a shielded cable, connect the cable shield to the earth ground terminal.

©National Instruments 3 NI TBX-2808 Installation Instructions
Figure 1. NI TBX-2808 Parts Locator Diagram
Installing Your Screw Terminal Accessory
Refer to Figure 2 and perform the following steps to connect the screw terminal accessory to the
NI SwitchBlock card connector:
1. Securely fasten the connector on one end of the cable to the NI SwitchBlock card connector
using the thumbscrews.
2. Securely fasten the connector on the other end of the cable to the screw terminal accessory
connector using the thumbscrews.
To disconnect the cable, unscrew the cable and gently pull on the backshell. Do not pull the
cable.
1CoverScrews
2 Cover
3 Cover Opening
4 Screw Terminals
1
1
3
2
4

NI TBX-2808 Installation Instructions 4 ni.com
Caution The connectors of both the NI SwitchBlock card and the cable are
polarized. You can attach them in only one way. Tie the ground terminal to an earth
ground to ground the screw terminal end of the cable shield. Do not force the cable
when inserting it into or removing it from the NI SwitchBlock card connector.
Figure 2. Connecting the Cable Assembly
1 NI SwitchBlock carrier
2 Thumbscrews
3 SH160F-160M-NI SwitchBlock cable
4 Cable backshells
5 Ground terminal
6 NI TBX-2808
7 Signal wires
2
3
4
1
5
6
7

©National Instruments 5 NI TBX-2808 Installation Instructions
Refer to Figure 3 for NI TBX-2808 pinouts.
Figure 3. NI TBX-2808 Pinouts
D32W1 E32W0 D31W1 E31W0 B30W1 C30W0 D30W1 E30W0 A30W1 A29W0 B29W1 C29W0 D29W1 E29W0
B28W1
C28W0 D28W1
E28W0 A28W1 A27W0 B27W1
C27W0 D27W1
E27W0 B26W1
C26W0 D26W1
E26W0 A26W1 A25W0
B25W1 C25W0 D25W1 E25W0 B24W1 C24W0 D24W1 E24W0 A24W1 A23W0 B23W1 C23W0 D23W1 E23W0 B22W1 C22W0
D22W1
E22W0 A22W1 A21W0 B21W1
C21W0 D21W1
E21W0 B20W1
C20W0 D20W1
E20W0 A20W1 A19W0 B19W1
C19W0
D19W1 E19W0 B18W1 C18W0 D18W1 E18W0 A18W1 A17W0 B17W1 C17W0 D17W1 E17W0 B16W1 C16W0 D16W1 E16W0
B13W1
C13W0 D13W1
E13W0 A14W1 A13W0 B14W1
C14W0 D14W1
E14W0 B15W1
C15W0 D15W1
E15W0 A16W1 A15W0
A10W1 A9W0 B10W1 C10W0 D10W1 E10W0 B11W1 C11W0 D11W1 E11W0 A12W1 A11W0 B12W1 C12W0 D12W1 E12W0
D6W1
E6W0 B7W1
C7W0 D7W1
E7W0 A8W1 A7W0 B8W1
C8W0 D8W1
E8W0 B9W1
C9W0 D9W1
E9W0
D3W1 E3W0 A4W1 A3W0 B4W1 C4W0 D4W1 E4W0 B5W1 C5W0 D5W1 E5W0 A6W1 A5W0 C6W1 B6W0
NC NC
B1W1
C1W0 D1W1
E1W0 A2W1 A1W0 B2W1
C2W0 D2W1
E2W0 B3W1
C3W0

NI TBX-2808 Installation Instructions 6 ni.com
Mounting the NI TBX-2808
When you have completed signal connections and terminal block installation, you can directly
mount the NI TBX-2808 assembly onto a DIN rail with a firm push.
To unmount the NI TBX-2808 from the DIN rail, place a flathead screwdriver into the slot above
the terminal block base and pry it away from the rail.
Environment
Operating temperature ......................................0 °C to 55 °C
Storage temperature ..........................................–20 °C to 70 °C
Relative humidity..............................................5% to 85%, noncondensing
Pollution Degree ...............................................2
Maximum altitude.............................................2,000 m
Indoor use only.
Compliance and Certifications
Safety
This product is UL Recognized as a component and meets the requirements of the following
standards of safety for electrical equipment for measurement, control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Caution Refer to the Read Me First: Safety and Electromagnetic Compatibility document for
important safety and electromagnetic compatibility information. To obtain a copy of this
document online, visit ni.com/manuals, and search for the document title.
Note For UL and other safety certifications, refer to the product label or the
Environmental Management section.
CE Compliance
This product meets the essential requirements of applicable European Directives as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Environmental Management
NI is committed to designing and manufacturing products in an environmentally responsible
manner. NI recognizes that eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.

©National Instruments 7 NI TBX-2808 Installation Instructions
For additional environmental information, refer to the NI and the Environment Web page at
ni.com/environment. This page contains the environmental regulations and directives with
which NI complies, as well as other environmental information not included in this document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of the product life cycle, all products must be sent to a
WEEE recycling center. For more information about WEEE recycling centers,
National Instruments WEEE initiatives, and compliance with WEEE Directive
2002/96/EC on Waste Electrical and Electronic Equipment, visit ni.com/
environment/weee.
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375891A-01 Jun12
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