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Allen-Bradley 1794-TB3S FLEX I/O Terminal Base Unit

1. Product Description

The 1794-TB3S is a removable terminal base unit designed for Allen-Bradley’s FLEX I/O system, providing a secure interface for field wiring connections to FLEX I/O modules. It supports hot-swapping (RIUP – Removal and Insertion Under Power), allowing module replacement without system shutdown, which reduces downtime in industrial automation systems .

2. Key Features

Tool-less Wiring – Uses spring-clamp terminals for quick and secure connections, supporting 0.34–3.3 mm² (22–14 AWG) solid or stranded copper wire .
Hot-Swappable (RIUP) – Enables module replacement without disrupting field wiring or system power .
High Current Capacity – Supports 10A maximum current on voltage/COM terminals and 2A on I/O terminals .
Wide Voltage Compatibility – Works with 24V DC/AC and 120V DC/AC systems .
Industrial Durability – Operates in -20°C to +70°C environments with IP20 protection and resists vibration (2G) and shock (30G) .
Modular Flexibility – Compatible with FLEX I/O modules (e.g., 1794-IB16, 1794-OB16P) and adapters (e.g., 1794-ADN, 1794-AENT) .

3. Technical Specifications

Parameter	Specification
Terminal Type	Spring-clamp (tool-less)
Wire Size	0.34–3.3 mm² (22–14 AWG)
Voltage Rating	24V DC/AC, 120V DC/AC
Max Current	10A (voltage/COM), 2A (I/O)
Isolation Voltage	125V continuous (field-to-FLEXbus)
Operating Temp.	-20°C to +70°C
Dimensions	94 × 94 × 69 mm
Certifications	UL, CSA, CE, RoHS

4. Applications

Manufacturing Automation – Connects sensors and actuators in assembly lines .
Process Control – Interfaces with valves and pumps in chemical plants.
Material Handling – Used in conveyor and packaging systems .

5. Installation & Precautions

Wiring Compliance – Use shielded cables in high-noise environments .
Environmental Limits – Avoid condensation or extreme temperatures .
Compatibility Check – Ensure proper alignment with FLEX I/O modules (e.g., 1794-IB16) .