Allen-Bradley 1794-TBN
Allen-Bradley 1794-TBN
Allen-Bradley 1794-TBN
Allen-Bradley 1794-TBN
Allen-Bradley 1794-TBN
Allen-Bradley 1794-TBN
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1794-TBN

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Allen-Bradley 1794-TBN is a NEMA-style screw-clamp FLEX I/O terminal base for mounting one compatible module and terminating field, common, and supply conductors.
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Technical specifications for 1794-TBN

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-TBN
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O NEMA Screw-Clamp Terminal Base
  • Stock:
    1
  • Terminal Style:
    NEMA screw clamp with terminal cover
  • I/O Terminals:
    16
  • Common Terminals:
    2
  • Positive Supply Terminals:
    2
  • Application Voltage:
    Up to 250 V AC/DC or installed-module limit
  • Maximum V/COM Current:
    10 A
  • Maximum I/O-Terminal Current:
    2 A
  • Terminal Torque:
    1.4 N·m
  • Wire Size:
    0.34…3.3 mm² copper
  • Wire Strip Length:
    9 mm
  • Mounting:
    35 mm DIN rail
  • Operating Temperature:
    -20…70 °C
  • Dimensions:
    9.4 × 9.4 × 6.9 cm
  • Weight:
    0.2 kg
  • Tariff Code:
    8538900000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Screw Terminals Voltage Segments Module Service Application
  • NEMA screw-clamp terminal base with a protective terminal cover
  • Provides 16 I/O connection points and two common terminals
  • Retains field wiring when a compatible FLEX I/O module is exchanged

1794-TBN is the screw-terminal option for FLEX I/O installations that need NEMA-style field termination and a protective cover.

Its removable electronics interface preserves the terminal base and field conductors when a compatible module is exchanged.

Because the terminal arrangement differs from cage-clamp variants, match the module wiring diagram, conductor gauge, torque, voltage class, and supply segmentation before substitution.

Availability, condition, price, and shipping time for 1794-TBN are confirmed during quotation.

Allen-Bradley 1794-TBN FLEX I/O NEMA Screw-Clamp Terminal Base Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • The NEMA base uses screw clamps and includes a protective terminal cover.
  • Sixteen I/O, two common, and two positive-supply connections are provided.
  • Conductor size, strip length, and terminal torque must follow the official limits.
  • Application voltage is limited by both the base and the installed I/O module.
  • Side connectors continue FLEXBUS and field power into adjacent terminal bases.
  • Separate incompatible voltage or isolation groups with the documented segmentation method.
  • Set the rotary key to the position specified for the selected electronics module.
  • Remove field and system power before changing modules or terminal conductors.
  • Inspect screw clamps, side contacts, cover, latch, and DIN-rail ground before reuse.
  • NEMA screw-terminal field wiring for compatible FLEX I/O modules.
  • Higher-voltage FLEX I/O field circuits within the base and installed-module ratings.
  • Modular DIN-rail stations requiring a covered screw-terminal service interface.
Description
Allen-Bradley 1794-TBN provides NEMA screw-clamp termination beneath one compatible FLEX I/O module on a 35 mm DIN rail.

The base supplies 16 I/O connections with two common and two +V terminals, supports higher application voltage than standard cage-clamp bases, and includes a terminal cover.

Before installation, verify module compatibility, terminal voltage and current, wire size, 1.4 N·m torque, field-power segmentation, keying, cover clearance, and DIN-rail grounding.
Revisions

Revision Part #

Also known as

1794-TBN Ser A
1794-TBN/A, Series A, Rev A
Alternative Names
1794-TBN 1794TBN 1794 TBN Allen-Bradley 1794-TBN Allen Bradley 1794-TBN AB 1794-TBN Rockwell Automation 1794-TBN
Technical notes
Before installing 1794-TBN, verify the compatible I/O module, terminal keying, 1.4 N·m tightening torque, voltage limits, and power distribution.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why would an installer choose Allen-Bradley 1794-TBN instead of a cage-clamp base?
It provides NEMA screw-clamp terminals, a broader documented conductor range, and a terminal cover. Confirm the selected I/O module approves the TBN base.
Which I/O modules can be mounted on Allen-Bradley 1794-TBN?
Compatibility is model-specific. Check the official installation instructions for the complete I/O module, its keyswitch position, field voltage, and required terminal arrangement.
What enclosure access is needed for Allen-Bradley 1794-TBN?
Allow sufficient front clearance to remove the terminal cover and reach the NEMA screw terminals for inspection or rewiring without disturbing adjacent FLEX I/O hardware.
Can Allen-Bradley 1794-TBN remain wired during module replacement?
Yes, the compatible electronics module is removable from the base, but hazardous power must be isolated and the base contacts, keying, and retained conductors inspected first.
What should be checked before using Allen-Bradley 1794-TBN at a higher field voltage?
Verify the installed module’s lower limit, insulation and segregation, enclosure rating, conductor voltage rating, terminal cover, branch protection, and local electrical rules.
Why can Allen-Bradley 1794-TBN overheat even when individual I/O currents seem low?
The shared V and common path has a total current limit. Check accumulated load, loose screw terminals, conductor size, ambient temperature, corrosion, and side-contact condition.
Can Allen-Bradley 1794-TBN directly replace Allen-Bradley 1794-TB2?
Not without a wiring review. The terminal style, count, conductor range, strip length, torque, cover, and common or supply arrangement differ between the two bases.

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