AB 1794-TB3
AB 1794-TB3
AB 1794-TB3
AB 1794-TB3
AB 1794-TB3
AB 1794-TB3
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1794-TB3

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Allen-Bradley 1794-TB3 is a three-wire cage-clamp FLEX I/O terminal base with 16 I/O, 18 common, and 18 +V connections.
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Technical specifications for 1794-TB3

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-TB3
  • Product Family:
    Flex I/O
  • Product Type:
    Three-Wire Cage-Clamp Terminal Base
  • Stock:
    1
  • Termination type:
    Cage clamp
  • I/O connections:
    16
  • Common terminals:
    18
  • Application voltage:
    Up to 125 V AC/DC
  • Maximum V/COM current:
    10 A
  • Maximum I/O-terminal current:
    2 A
  • Wiring category:
    2, 3, or 4
  • Primary documented use:
    Three-wire input proximity switches; also usable with output modules
  • Terminal screw torque:
    0.56...0.79 N·m
  • Wire size:
    0.34...3.3 mm² solid or stranded copper, 75 °C or greater
  • Wire strip length:
    5...6 mm
  • Isolation capability:
    125 V continuous maximum, field terminals to FLEXBUS, or installed-module limit
  • Installed base/module dimensions:
    9.4 × 9.4 × 6.9 cm height × width × depth
  • Operating temperature:
    -20...70 °C
  • 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 Connections Ratings Installation Application
  • The cage-clamp base provides 16 I/O, 18 common, and 18 +V connections
  • It is primarily intended for input modules using three-wire proximity switches
  • The 1794-TB3 can also terminate compatible FLEX I/O output modules

1794-TB3 is an Allen-Bradley FLEX I/O three-wire cage-clamp terminal base for field wiring and module connection.

The base provides sixteen I/O connections, eighteen common terminals, and eighteen +V terminals for applications up to 125 V AC/DC, with primary use in three-wire proximity-input arrangements and support for compatible output modules.

Before installation or replacement, verify Series A, the installed FLEX I/O module, keyswitch position, field voltage, terminal current, wire size, strip length, screw torque, DIN-rail assembly, and the original terminal map.

Availability, condition, price, and shipping time for 1794-TB3 are confirmed during quotation.

Allen-Bradley 1794-TB3 Three-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 terminal base provides sixteen I/O connection points
  • Eighteen common terminals are available for three-wire field-device returns
  • Eighteen positive-voltage terminals are available for field-device supply distribution
  • The documented application range extends to 125 volts AC or DC
  • V and COM terminals are rated for 10 amperes maximum
  • Individual I/O terminals are rated for 2 amperes maximum
  • Cage-clamp terminals accept 0.34 to 3.3 square millimetre copper conductors
  • The documented strip length is 5 to 6 millimetres
  • Terminal screw torque is 0.56 to 0.79 newton-metres
  • Three-wire input proximity-switch termination in FLEX I/O stations
  • Field termination for compatible FLEX I/O output modules
  • Distributed FLEX I/O installations requiring 16 signal, 18 common, and 18 +V connection points
Description
1794-TB3 is an Allen-Bradley FLEX I/O three-wire cage-clamp terminal base for distributed-I/O field wiring.

It provides sixteen I/O, eighteen common, and eighteen +V connections for applications up to 125 V AC/DC and is intended primarily for three-wire proximity inputs while also supporting compatible output modules.

Before installation or replacement, confirm the complete catalog number, Series A base, installed module, keyswitch, voltage, current, wire size, strip length, torque, DIN-rail fit, and recorded terminal assignments.
Revisions

Revision Part #

Also known as

1794-TB3 Ser A
1794-TB3/A, Series A, Rev A
Alternative Names
1794-TB3 1794TB3 1794 TB3 Allen-Bradley 1794-TB3 Rockwell Automation 1794-TB3 AB 1794-TB3 FLEX I/O 1794-TB3
Technical notes
1794-TB3 is the standard cage-clamp three-wire base, not the spring-clamp or conformally coated variant; verify Series A, module compatibility, keyswitch, 125 V limit, terminal current, wiring, and torque.
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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.
Can an I/O module be replaced without removing field wiring from Allen-Bradley 1794-TB3?
Yes. The FLEX I/O module can be removed from the terminal base while the field wiring remains terminated on 1794-TB3. Follow the published power and hazardous-location precautions before removal.
How should Allen-Bradley 1794-TB3 be secured on a DIN rail?
Mount it on the specified DIN rail and install 1492-EA35 end anchors at both ends of the FLEX I/O assembly to prevent lateral movement.
Which terminals are used to continue field power through Allen-Bradley 1794-TB3?
Use terminals C-34 and B-16 for incoming field power and terminals C-51 and B-33 to continue the corresponding supply to the next terminal base, following the module wiring diagram.
Should analog and digital FLEX I/O modules share one field supply on Allen-Bradley 1794-TB3?
Use separate power supplies when required by the installed modules and noise-control design. Confirm each module's wiring diagram, commons, grounding, and isolation before grouping supplies.
How is the keyswitch on Allen-Bradley 1794-TB3 set?
Rotate the terminal-base keyswitch to the position specified for the exact FLEX I/O module before installing the module. An incorrect position prevents the intended module from seating correctly.
What should be checked before adding Allen-Bradley 1794-TB3 to an existing FLEX I/O assembly?
Verify terminal-base compatibility, adapter capacity, FLEXBus current, field-power grouping, key position, DIN-rail space, and the wiring assignments of the adjacent base.
What enclosure protection is required for Allen-Bradley 1794-TB3 in Zone 2 installations?
Install the assembly in an enclosure that meets the applicable hazardous-location requirements; Rockwell instructions specify at least IP54 protection for ATEX Zone 2 use.

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