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

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 have 18 terminals each for common and voltage connections. This unit supports daisy-chaining to nearby Flex I/O modules. It draws 640 mA at 5 VDC from the backplane. The voltage rating is 120 VAC with a maximum current of 10 Amperes.

Application Scenarios

Use the 1794-TB3 to mount and wire Flex I/O modules such as 1794-IA8, 1794-OB16D, and others. It is suitable for industrial automation systems that require a compact, modular I/O architecture. The terminal base enables easy field wiring and power distribution. It works in control panels and machine control applications.

Technical Specifications

Rated for 640 mA at 5 VDC backplane current. Voltage rating is 120 VAC, max 132 VAC. Current capacity is 10 Amperes. It has 52 terminals with two terminal rows. Wire size range is 0.34-3.3 mm². Screw torque is 0.56-0.79 Nm. Isolation voltage is 125V continuous. Dimensions are 94 mm x 94 mm x 69 mm. It supports DIN rail mounting.

Installation & Maintenance Guide

Install the 1794-TB3 on a DIN rail. Position it at an angle and hook the top edge over the rail. Slide it tight against the adjacent adapter module. Push the base until it locks onto the DIN rail. Connect I/O wiring to the top terminal strip. Connect common and supply to the middle and bottom strips. For daisy-chaining, use terminals C-34 (+) and B-16 (-) for supply in, and C-51 (+) and B-33 (-) for supply out. No special maintenance is required beyond periodic checking of screw tightness.

Packing List

1x 1794-TB3 Flex I/O Terminal Base Unit
1x Quick Start Guide
Shipping is via Fedex, UPS, or DHL.