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

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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.
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