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National Instruments TBX-68 Unshielded screw-terminal block
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National Instruments · NI Data Acquisition

TBX-68

The National Instruments TBX-68 is an unshielded terminal block for connecting field I/O to compatible 68-pin NI DAQ devices. It provides 68 screw terminals, a male SCSI connector, and DIN-rail mounting.

ManufacturerNational Instruments
ModelTBX-68
Part Number777141-01
Product TypeUnshielded screw-terminal block
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Free Shippingfull policy linked
30-Day Warrantystandard coverage
30-Day Returnspolicy applies
Technical Supportmodel & compatibility help
Field connections68 screw terminals
Cable interfaceOne 68-pin male SCSI connector
MountingStandard DIN rail
Signal mappingDirect mapping to DAQ connector pins
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Overview

Product overview

Key product information and technical features.

The TBX-68 provides a screw-terminal interface between field wiring and a compatible NI DAQ device. Its protective plastic base supports installation on a standard DIN rail.

Terminal numbers map directly to the DAQ connector pins. Use the connected device's pinout to identify each terminal's signal function rather than assuming a universal analog or digital channel assignment.

  • Screw-terminal access to 68 field I/O connections.
  • Male 68-pin SCSI interface for cable connection.
  • Protective plastic base with DIN-rail mounting hardware.
  • Direct pin mapping simplifies reference to the connected DAQ device's wiring documentation.
Verified specifications

Technical data

Verified product specifications.

Screw terminals68
I/O connectorOne 68-pin male SCSI
ShieldingUnshielded
DIN-rail width35 mm
Dimensions12.8 × 12.5 × 6.0 cm
Weight251 g
Wire gauge12–30 AWG
Terminal tightening torque0.8 N·m
Operating temperature0 to 70 °C
Storage temperature−20 to 70 °C
Operating and storage humidity5–90, noncondensing % RH
Maximum altitude2000 m
Condition & included items

What the actual unit includes

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Condition

Confirmed per unit.

Included

Device / accessories confirmed in quote.

Revision

Exact revision confirmed when relevant.

Compatibility

Complete the measurement chain

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National Instruments

Manufacturer

68-pin NI DAQ

Host device interface

TBX-68

DIN-rail field-wiring terminal block

Pin assignments

Determine signal functions from the connected DAQ device's pinout.

Use the device-specific cable. Do not exceed 30 Vrms/42 Vpk/60 VDC; do not use for Measurement Categories II, III, or IV.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI TBX-68 Product PageProduct Page · ni.com
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NI TBX-68 User Guide, 373987A-01User Guide And Specifications · docs-be.ni.com
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TBX-68 Dimensional DrawingsDimensional Drawings · ni.com
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TBX-68 Pinout DetailsTechnical resource
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Shipping, warranty & returns

Commercial terms

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Shipping
Free Shipping. Full policy terms apply.
Warranty
30-Day Warranty. Standard coverage applies.
Returns
30-Day Returns. Return policy applies.
Price / Availability
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Lifecycle services

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

How are TBX-68 terminals assigned to signals?

Each terminal maps directly to its corresponding DAQ connector pin. Refer to the connected DAQ device's pinout for signal names and functions.

Is the TBX-68 shielded?

No. NI identifies it as an unshielded screw-terminal accessory.

Which cable should be used?

Select the correct cable for the specific DAQ device; the TBX-68 has a 68-pin male SCSI connector.

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