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

Product Overview

The 1794-TB3 is a terminal base unit from the Allen-Bradley Flex I/O platform. It provides 52 screw clamp terminals arranged in three strips. The top strip has 16 I/O terminals. The middle and bottom strips each have 18 terminals for common and supply connections. This unit handles a supply voltage of 120 VAC and a maximum current of 10 Amperes. It draws 640 mA at 5 VDC from the backplane.

Application Scenarios

This terminal base is used in industrial automation systems to connect field devices and power supplies. It works with many Flex I/O modules like the 1794-IA8, 1794-OB16, and 1794-OV16. You can mount it on a DIN rail and daisy-chain it to other terminal bases. It is ideal for control panels requiring a compact and flexible wiring solution.

Technical Specifications

The 1794-TB3 has a voltage rating of 120 VAC and a current capacity of 10 Amperes. The backplane current draw is 640 mA at 5 VDC. It has 52 terminals total. The wire size ranges from 0.34 to 3.3 mm². Terminal screw torque is 0.56-0.79 Nm. Dimensions are 94 x 94 x 69 mm. The unit supports daisy-chaining with dedicated terminals for supply in and out. Isolation voltage is 125V continuous.

Installation & Maintenance Guide

Install the 1794-TB3 on a DIN rail by hooking the top edge over the rail and then pushing down until it locks. Ensure the FlexBus connector engages with the adjacent adapter. For wiring, use screw clamp terminals. Tighten screws to the specified torque. For daisy-chaining, connect the supply out terminals to the next base. No special maintenance is required beyond periodic checks for loose connections.

Packing List

1 x 1794-TB3 Terminal Base Unit
1 x Installation Manual