Allen-Bradley 1794-TB2 1794-TB2/A
Allen-Bradley 1794-TB2 1794-TB2/A
Allen-Bradley 1794-TB2 1794-TB2/A
Allen-Bradley 1794-TB2 1794-TB2/A
Allen-Bradley 1794-TB2 1794-TB2/A
Allen-Bradley 1794-TB2 1794-TB2/A
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1794-TB2 1794-TB2/A

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The Allen-Bradley 1794-TB2 terminal block is part of the Flex I/O 1794 family of products, designed for versatile industrial field applications requiring reliable distributed I/O connectivity.
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Technical specifications for 1794-TB2 1794-TB2/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-TB2 1794-TB2/A
  • Product Family:
    Flex I/O
  • Wire Size Supported:
    0.21 to 1.3 mm² (24 to 16 AWG)
  • Max Current per Terminal:
    10A
  • Number of Terminals:
    18 common and 2 voltage terminals
  • Isolation Voltage:
    125 V continuous
  • Terminal Screw Torque:
    0.56 to 0.79 Nm
  • Supply Voltage Range:
    Max 125 V AC/DC
  • Number of I/O Connections:
    16 I/Os
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    10x8.5x6cm
  • Tariff Code:
    8537101190
  • 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 Specifications Use Cases Operating Environment Safety & Compliance

Features:

  • Electrical Interface Between Field Wiring and Flex I/O Adapter Modules
  • Combines Cage Clamp Termination Technology with High-Density Terminal Configuration
  • Operates in Conjunction with the 1794 Series Flex I/O Adapters and I/O Modules
The 1794-TB2 1794-TB2/A operates as the standard terminal base in a Flex I/O system, providing reliable wire termination for all I/O modules within the station. It continuously secures field wiring connections (0.21 mm² to 1.3 mm², 24 to 16 AWG) and distributes signals through the backplane interface to support steady state operation of all adapters and I/O modules. Stable signal transfer is standard with the 1794-TB2, with its 18 common terminals and 2 dedicated voltage terminals enabling organized termination of multiple field devices. The 1794-TB2/A has made improvements in wiring density and termination security over previous terminal base designs in addition to incorporating standardized cage clamp technology within the Flex I/O architecture.

The 1794-TB2 provides essential termination functions common to the entire I/O station, and is a critical component of the signal path, directly affecting the proper, normal operation of the overall control system. One 1794-TB2 terminal base is required per I/O module in the Flex I/O station depending on the specific configuration requirements. The 1794-TB2 occupies the physical mounting position beneath each I/O module and is always installed in conjunction with the corresponding adapter module.

For expanded I/O applications, the Flex I/O System requires additional 1794-TB2 terminal bases installed for each I/O module in the station. In addition to standard single module termination, the modular configuration also performs organized signal routing. The 1794-TB2/A terminal base configuration executes connectivity using the internal clamping mechanism specified in the terminal specifications. Using this method, the terminal base system continually maintains secure contact with field wiring. If the system detects that a wire connection requires maintenance (outside proper torque or engagement levels), it allows for tool-free retermination and ensures continuous operation of the I/O station.

The 1794-TB2 1794-TB2/A Allen-Bradley Flex I/O Terminal Base may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-TB2 1794-TB2/A Flex I/O Terminal Base Manuals,Datasheets,Link 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.
Allen-Bradley 1794-TB2 1794-TB2/A Flex I/O Terminal Base Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-TB2 1794-TB2/A
  • Condition New Original ready stock
  • Product Family 1794-TB3,1794-TB3K,1794-TB32
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.
  • Distributed Industrial Control: Used in modular control systems where space-saving rack-based functionality is needed.
  • Direct Field Wiring: Allows for 2-wire field device connections (e.g., limit switches, proximity sensors) directly to the terminal base, reducing the need for external terminal blocks.
  • Module Compatibility: Primarily used with 1794-OB16 digital output modules and various analog/specialty modules. Note: It is not compatible with 1794-IB16 modules.
  • Power Daisy-Chaining: Features two separate connection terminals to daisy-chain field power to adjacent terminal bases within the same system.
  • Temperature: Operating range of 0…55 °C (32…131 °F).
  • Humidity: 5% to 95% non-condensing.
  • Shock: 30 g peak acceleration (operating). Vibration: Tested at 5 g @ 10…500 Hz.
  • Altitude: Rated for use up to 2000 m (6562 ft) without derating.
  • Marine: Certified by ABS (American Bureau of Shipping) and RINA.
  • General Standards: CE, UKCA, RCM (Australia), KC (Korea), and CCC (China).
  • Voltage Limits: Must be used at or below 60V AC or 75V DC in specific configurations.
  • Isolation: Provides basic insulation (tested @ 850V AC) between field and system sides.
  • Hazardous Locations: North America: UL/CSA listed for Class I, Division 2, Groups A, B, C, and D. European/Global: ATEX (Zone 2) and IECEx certified for explosive atmospheres.
Description
The 1794-TB2 terminal base from Allen-Bradley is part of the Flex I/O 1794 series, engineered for versatile industrial field applications requiring reliable distributed I/O connectivity. This 1794-TB2 unit utilizes cage clamp termination technology to secure wiring efficiently, accommodating conductor sizes ranging from 0.21 mm² to 1.3 mm² (24 to 16 AWG). Each terminal on the 1794-TB2 can manage continuous currents of up to 10A, delivering dependable connectivity for demanding industrial operations.

This 1794-TB2/A terminal base houses a total of 18 common terminals alongside 2 dedicated voltage terminals, with the capability to handle supply voltages of up to 125 V AC/DC. The isolation voltage for the 1794-TB2 is rated at 125 V continuous, ensuring safe electrical separation and operational integrity in industrial environments.

The 1794-TB2 demonstrates robust environmental resilience, capable of operating within temperature ranges from -20 to 55 °C, while storage conditions can extend from -40 to 85 °C. The 1794-TB2/A exhibits impressive mechanical durability, withstanding operational shock levels of up to 30 g and non-operational shock resistance of up to 50 g. For comprehensive safety assurance, the 1794-TB2 is fully compliant with UL, CSA, and Ex certification standards, confirming its reliability and safety qualifications across diverse industrial applications.

This 1794-TB2 terminal base is specifically designed for handling distributed I/O termination challenges in modular automation systems, solving the critical problem of establishing secure, standardized connections between field devices and Flex I/O adapters in space-constrained industrial environments.
Revisions

Revision Part #

Also known as

1794-TB2 Ser A
1794-TB2/A, Series A, Rev A
Alternative Names
1794-TB3 1794-TB2 1794-TB2/A 1794-TB3K 1794-TB32
Technical notes
The Allen-Bradley 1794-TB2 Flex I/O Terminal Base Unit has a 0.56-0.79 Nm Terminal Screw Torque, a 125V DC/AC, 50/60Hz, 10A Supply Voltage Range max., and a 125V Continuous Isolation Voltage. It also operates with a 0.21-1.3 mm^2 Wire Size and a 94x94x69 mm Dimensions.
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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.
What is the Allen-Bradley 1794-TB2 terminal base used for?
The Allen-Bradley 1794-TB2 terminal base is designed for distributed I/O systems in industrial automation. It provides a reliable interface between field devices and Flex I/O adapters, ensuring stable and standardized signal connections in modular control architectures.
What wiring technology does the 1794-TB2 use?
The 1794-TB2 utilizes cage clamp termination technology, which allows secure and efficient wiring. It supports conductor sizes from 0.21 mm² to 1.3 mm² (24 to 16 AWG), making it suitable for a wide range of industrial wiring requirements.
What problem does the 1794-TB2 solve in automation systems?
The 1794-TB2 addresses the challenge of secure and space-efficient I/O termination in distributed systems, enabling consistent and reliable connections between field devices and control systems in compact industrial installations.

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