Product Overview

The 1794-TB32 serves as the physical mounting and wiring interface for Flex I/O modules. You install the module onto this base after completing field wiring. The base provides 32 I/O terminals for signal connections. It also includes 8 common terminals and 8 voltage terminals. This design simplifies distributed I/O system installation. The base works with any 32-point Flex I/O module requiring this terminal configuration.

Technical Specifications

The 1794-TB32 delivers robust electrical and mechanical performance for industrial environments.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Part Number: 1794-TB32

• Product Type: Flex I/O Terminal Base Unit

• Maximum I/O Connections: 32 terminals

• Common Terminals: 8

• Voltage Terminals: 8

• Supply Voltage Range: 31.2V AC/DC maximum at 50/60 Hz

• Nominal Voltage Rating: 24V AC/DC

• Continuous Current Rating: 10 Amps

• FlexBus Current Rating: 640 mA at 5V DC

• Maximum I/O Terminal Rating: 2 Amps

Electrical Isolation

• Isolation Voltage: 50 Volts continuous maximum

• Insulation Type: Basic Type

• Test Voltage: 2121 Volts DC for 1 minute (Field terminals to FlexBus)

Mechanical Specifications

• Wire Size: 0.21 to 1.3 mm² (16-22 AWG typical)

• Terminal Screw Torque: 0.56 to 0.79 Nm (5 to 7 lb-in)

• Dimensions (with module): 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 inches)

• Enclosure Type: Open style

Environmental Ratings

• Operating Temperature: -20 to 70 °C (-4 to 158 °F)

• Storage Temperature: -40 to 85 °C (-40 to 185 °F)

• Relative Humidity: 5 to 95% non-condensing

• Operating Vibration: 5G

• Operating Shock: 30G

• Temperature Code: IEC T4 and T4A (North America)

Mounting Options

• DIN Rail Mounting: Standard 35mm DIN rail

• Panel Mounting: Direct screw mounting

Status and Compatibility

• Keyswitch Position: Depends on the installed module

• Certifications: c-UL-us, CSA

Compatible Modules

The 1794-TB32 works with any 32-point Flex I/O module. Common compatible modules include:

• 1794-IB32 Digital Input Module

• 1794-OB32 Digital Output Module

• Other 32-channel Flex I/O modules requiring this base type

Installation Guidance

Follow these steps to install the 1794-TB32 correctly.

1. Choose Mounting Method: Select DIN rail or panel mounting for your application.

2. Secure the Base: Snap onto 35mm DIN rail or screw directly to the panel.

3. Terminate Field Wires: Connect sensors or actuators to the 32 I/O terminals.

4. Connect Common and Voltage: Wire the 8 common and 8 voltage terminals as needed.

5. Verify Torque: Tighten each screw to 0.56-0.79 Nm for reliable connection.

6. Insert the Module: Press the Flex I/O module firmly into the 1794-TB32.

7. Attach Adapter: Connect a communication adapter on the left side of the base.

The 1794-TB32 allows module removal and insertion without rewiring. Field wires remain terminated to the base during module replacement. This feature reduces maintenance downtime significantly.

Package Contents

• One (1) Allen-Bradley 1794-TB32 Flex I/O Terminal Base Unit

• Installation instructions leaflet

Frequently Asked Questions (FAQ)

1. What modules work with the 1794-TB32 terminal base?
The 1794-TB32 works with any 32-point Flex I/O module. Compatible modules include digital input and output types that require 32 I/O connections.

2. Can the 1794-TB32 be mounted on a DIN rail?
Yes, the 1794-TB32 supports both DIN rail and panel mounting. The DIN rail option uses a standard 35mm rail for quick installation.

3. What is the wire size range for the 1794-TB32 terminals?
The 1794-TB32 accepts wire sizes from 0.21 to 1.3 mm². This range corresponds to approximately 16 to 22 AWG copper wire.

4. Does the 1794-TB32 provide isolation between field wiring and the bus?
Yes, the 1794-TB32 provides 50 Volts continuous isolation. The base is tested at 2121 Volts DC for 1 minute between field terminals and FlexBus.

5. How many terminal points does the 1794-TB32 have?
The 1794-TB32 has 32 I/O terminals plus 8 common terminals and 8 voltage terminals. This configuration supports complex field wiring requirements.