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

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

The Allen-Bradley 1794-TB3 offers an advanced terminal base solution for complex Flex I/O wiring requirements. This unit features organized terminal strips with dedicated sections for different signal types. 

Terminal Configuration

• Organized top strip with sixteen I/O terminals (positions 0-15)
• Dedicated middle strip with eighteen common terminals (positions 16-33)
• Separate bottom strip with eighteen voltage terminals (positions 34-51)

Daisy-Chain Connectivity

• Flexible daisy-chaining capability for system expansion
• Input connections use C-34 (+) and B-16 (-) terminals
• Output connections use C-51 (+) and B-33 (-) terminals
• The 1794-TB3 supports multiple base units in a single chain
• This feature enables efficient wiring in distributed control systems
• Daisy-chain design reduces overall wiring complexity and costs

Electrical Specifications

• Efficient backplane current of 640 mA at 5VDC for module power
• Multiple voltage ratings including 24V and 120V AC/DC systems
• High maximum voltage range up to 132V AC for various applications
• Safe isolation voltage of 125V continuous for circuit protection
• Substantial current rating up to 10 Amperes per terminal
• Proper terminal screw torque of 0.56–0.79 Nm (5–7 lb-in)

Mechanical Specifications

• Compact dimensions of 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in)
• Standard DIN rail mounting for easy panel installation
• Robust construction ensures long-term reliability in industrial use
• The base unit maintains precise alignment for module connection

Environmental Ratings

• Wide operating temperature from -20°C to 70°C for harsh environments
• Broad storage humidity range of 5-95% non-condensing
• Excellent shock resistance of 30G during operation
• Strong vibration tolerance of 5G at 10-500 Hz
• The 1794-TB3 performs reliably in demanding industrial conditions
• All environmental ratings meet industrial automation standards

Frequently Asked Questions

• How many terminals does this base unit provide? The 1794-TB3 offers fifty-two terminals across three separate strips.
• What is the daisy-chain capability? This base supports daisy-chaining using specific (+) and (-) terminals for expansion.
• What temperature range does it support? It operates from -20°C to 70°C for extreme environment applications.
• What is the backplane current requirement? The base requires 640 mA at 5VDC for proper module operation.