Flex I/O Terminal Base Unit Allen-Bradley 1794-TB3

Product Overview

The 1794-TB3 is a terminal base unit for the Allen-Bradley Flex I/O platform. It uses three screw clamp terminal strips. The top strip has 16 I/O terminals. The middle and bottom strips have 18 terminals each for common and supply connections. This unit provides 52 connection points total. It supports daisy-chaining to nearby modules. The 1794-TB3 is rated for 120 VAC and 10 A.

Application Scenarios

Use the 1794-TB3 in industrial control cabinets. It hosts digital and analog I/O modules from the 1794 series. Common modules include 1794-IA8, 1794-OB16D, and 1794-IB16XT. The terminal base works with 24 VDC and 120 VAC systems. Daisy-chain multiple bases to build a flexible I/O network. It is ideal for factory automation, process control, and material handling systems.

Technical Specifications

• Voltage rating: 120 VAC (max 132 VAC)
• Current rating: 10 A
• Backplane current: 640 mA @ 5 VDC
• Wire size: 0.34 - 3.3 mm² (22 - 12 AWG)
• Screw torque: 0.56 - 0.79 Nm
• Number of terminals: 52
• Dimensions: 94 x 94 x 69 mm
• Isolation voltage: 125 V continuous
• Compatible modules: 1794-IA8, 1794-OB16D, and many others

Installation & Maintenance Guide

Install the 1794-TB3 on a DIN rail. Hook the base over the top of the rail. Push it down until it locks. Ensure the FlexBus connector engages with the adjacent adapter. Tighten screws to the specified torque. Use copper conductors only. Keep wire insulation thickness at 1.2 mm or less. The unit is keyed to prevent incorrect module insertion. No regular maintenance is required beyond periodic inspection of connections.

Packing List

Each package contains one 1794-TB3 terminal base unit. No additional accessories are included. The unit ships in Anti-static packaging. It is ready for immediate installation.