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1794-TB2

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Allen-Bradley 1794-TB2 is a two-wire cage-clamp FLEX I/O terminal base that mounts one compatible module and terminates field, common, and supply wiring.
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Ships by Wednesday, October 28
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Technical specifications for 1794-TB2

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-TB2
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O Two-Wire Cage-Clamp Terminal Base
  • Stock:
    1
  • Terminal Style:
    Cage clamp
  • Wiring Arrangement:
    Two-wire
  • I/O Terminals:
    16
  • Common Terminals:
    18
  • Positive Supply Terminals:
    2
  • Maximum V/COM Current:
    10 A
  • Maximum I/O-Terminal Current:
    2 A
  • Terminal Torque:
    0.56…0.79 N·m
  • Wire Size:
    0.34…1.3 mm² stranded copper
  • Wire Strip Length:
    5…6 mm
  • Mounting:
    35 mm DIN rail
  • Operating Temperature:
    -20…55 °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 Terminal Layout Power Distribution Mechanical Checks Application
  • Cage-clamp terminal base for compatible FLEX I/O modules
  • Provides 16 I/O terminals for two-wire field connections
  • Keeps field conductors landed while the electronics module is removed or replaced

1794-TB2 forms the mechanical, electrical, and field-wiring interface beneath one FLEX I/O module.

Its cage-clamp terminals retain the field wiring when the removable electronics module is changed, reducing the need to disturb individual conductors.

Select it only after checking the module’s approved base list, conductor type, terminal capacity, application voltage, and required common or power distribution.

Availability, condition, price, and shipping time for 1794-TB2 are confirmed during quotation.

Allen-Bradley 1794-TB2 FLEX I/O Two-Wire Cage-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 two-wire base provides 16 I/O, 18 common, and two positive-supply terminals.
  • Cage-clamp terminals retain field conductors independently from the removable electronics module.
  • Terminal numbering must be matched to the installed module’s official wiring diagram.
  • FLEXBUS and field-power connections continue through the side connectors of adjacent bases.
  • Keep V and common current within the documented terminal-base limit.
  • Start a separate field-power segment when voltage, current, or isolation requirements change.
  • Mount the base squarely on grounded 35 mm DIN rail before attaching adjacent units.
  • Set the keyswitch to the position required by the selected I/O module.
  • Inspect side contacts, latch, terminal clamps, and module seating before energizing.
  • Two-wire field termination for compatible FLEX I/O input or output modules.
  • DIN-rail distribution of FLEXBUS, field supply, and common connections across a modular station.
  • Maintenance installations where electronics are replaced without removing the retained field conductors.
Description
Allen-Bradley 1794-TB2 is a DIN-rail terminal base with cage-clamp connections for one compatible FLEX I/O module.

The two-wire base provides 16 I/O terminals, 18 common terminals, and two +V terminals while continuing FLEXBUS and field-power connections through the station.

Before installation, confirm module compatibility, voltage and current limits, wire size, strip length, terminal torque, DIN-rail grounding, keying, and power-segmentation requirements.
Revisions

Revision Part #

Also known as

1794-TB2 Ser A
1794-TB2/A, Series A, Rev A
Alternative Names
1794-TB2 1794TB2 1794 TB2 Allen-Bradley 1794-TB2 Allen Bradley 1794-TB2 AB 1794-TB2 Rockwell Automation 1794-TB2
Technical notes
1794-TB2 must match the selected FLEX I/O module, voltage class, cage-clamp conductor range, keying, current distribution, and power segmentation; a three-wire base is not a wiring-equivalent substitute.
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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.
How can a buyer confirm that Allen-Bradley 1794-TB2 suits the selected I/O module?
Check the module’s official compatible-terminal-base list, required keyswitch position, field voltage, conductor count, isolation arrangement, and any special shield or power terminals.
Can Allen-Bradley 1794-TB2 field wiring remain in place when the I/O module is changed?
The electronics module can separate from the base while conductors remain terminated, but all hazardous power must be removed and terminal condition and keying should be verified.
What conductor preparation is important for Allen-Bradley 1794-TB2?
Use copper conductors within the documented size range, strip only the specified length, avoid damaged strands, and tighten the cage-clamp mechanism to the official torque.
Why should power segmentation be reviewed before adding Allen-Bradley 1794-TB2?
A FLEX I/O row carries field supply and common connections between bases. Verify voltage class, current, isolation, and the point where a new supply segment must begin.
What should be checked if field signals become intermittent after wiring Allen-Bradley 1794-TB2?
Verify conductor strip length and seating, cage-clamp torque, terminal assignments, side-bus engagement, module seating, DIN-rail alignment, supply continuity, and vibration before replacing the electronics module.
Can Allen-Bradley 1794-TB2 replace a three-wire terminal base without rewiring?
Not automatically. The terminal counts and power distribution differ, so compare every conductor, sensor return, common, shield, module compatibility, and enclosure layout before changing base style.
Why might a module mounted on Allen-Bradley 1794-TB2 lose communication intermittently?
Check full module seating, DIN-rail alignment, side FLEXBUS contacts, base-to-base connection, power continuity, terminal damage, and vibration or contamination around the base.