Allen Bradley 1794-TB2 Flex Terminal Block Base Ser A

Overview

The Allen-Bradley 1794-TB2 is a versatile terminal block base designed for the Flex I/O 1794 series, widely deployed in industrial automation and controls. This unit serves as a passive interface for distributing 24–16 AWG field wiring to I/O modules mounted within the Flex I/O ecosystem. With cage clamp termination and 125V DC/AC isolation rating, the 1794-TB2 provides secure, organized electrical connections in demanding industrial environments.

Key Features

• 16 input/output terminals plus 18 common terminals and 2 dedicated voltage terminals for flexible circuit distribution
• Cage clamp termination simplifies wiring and eliminates screw-strip labor while supporting 24–16 AWG solid or stranded copper wire
• 10 amp maximum current capacity per terminal with 0.56–0.79 Nm screw torque specification
• 125V continuous isolation voltage rating for safe separation between field wiring and system bus
• DIN rail and panel mounting options with open-style enclosure for compact installations
• UL Listed for industrial control equipment (UL File E65584) and certified for US/Canada hazardous locations

Technical Specifications

• Supply Voltage: 125V DC/AC (120V AC, 24V DC nominal), 50/60 Hz
• Isolation Voltage: 125V continuous, 2121V DC tested (field wiring to FLEXBUS)
• Current Capacity: 10A per terminal, maximum
• Wire Size: 0.21–1.3 mm² (24–16 AWG) solid or stranded copper, 1.2 mm (3/64 in.) max insulation
• Terminal Screw Torque: 0.56–0.79 Nm (5–7 lb-in)
• Terminal Configuration: 16 I/O + 18 common + 2 +V terminals
• Mounting: DIN rail and panel mount compatible
• Operating Temperature: 0 to 55 °C
• Storage Temperature: −40 to 85 °C
• Dimensions: 94 × 94 × 69 mm (3.7 × 3.7 × 2.7 in.)
• Operating Shock: 30g; non-operating 50g
• Certifications: UL, CE, CSA, C-TICK, GOST, KC

Typical Applications

• Distributed field I/O wiring in CompactLogix and ControlLogix Flex I/O architectures
• In-cabinet terminal aggregation for analog and discrete input/output modules
• Modular automation systems requiring secure cage clamp connections and open-style terminal distribution
• Factory and process automation where space-efficient DIN rail or panel mounting is required

Compatibility & Replacements

Compatible With

• Allen-Bradley Flex I/O 1794 series remote I/O modules (digital and analog)
• CompactLogix controllers via Flex I/O gateway and EtherNet/IP communication
• ControlLogix systems using local Flex I/O architectures
• FLEXBUS protocol for Flex I/O extension and module communication

Replaces / Drop-In Replacement For

The 1794-TB2 is a specific terminal base configuration. Verify compatibility with your system integrator before ordering to ensure module compatibility and wiring specifications match your application. Alternative terminal base models in the 1794 series (such as 1794-TB3 variants) may have different terminal configurations or voltage ratings.

Works With

• Allen-Bradley Studio 5000 / RSLogix 5000 programming software
• Flex I/O 1794 discrete and analog input/output modules
• EtherNet/IP networks via CompactLogix and ControlLogix gateways
• 1794 series extender cables for split or multi-row I/O configurations