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

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

Key Technical Specifications

• Manufacturer: Allen‑Bradley
• Part Number: 1794-TB3
• Supply Voltage Range: 125V DC/AC, 50/60Hz, 10A (max)
• Backplane Current Draw: 640 mA @ 5V DC
• Terminal Configuration: 52 terminals in three strips (16 I/O, 18 common, 18 supply)
• Wire Size: 0.34 – 3.3 mm² (22–12 AWG), insulation thickness 1.2 mm
• Screw Torque: 0.56–0.79 Nm (5–7 lb‑in)
• Isolation Voltage: 125V continuous (basic insulation)
• Dimensions: 94 x 94 x 69 mm (H x W x D)
• Operating Temperature: -20 °C to 70 °C (-4 °F to 158 °F)
• Relative Humidity: 5–95% non‑condensing
• Shock & Vibration: 30G shock, 5G vibration (10–500 Hz)

Installation & Mounting Guide

• Position the 1794-TB3 at a slight angle over the DIN rail top.
• Hook the base over the rail and slide it firmly against the adjacent adapter.
• Push the base downward until it locks securely onto the DIN rail.
• Ensure the FlexBus connector engages properly with the adapter module.
• Use the screw‑clamp terminals for reliable field wiring connections.

Compatible I/O Modules (Partial List)

• 1794-IA8, 1794-IA8I, 1794-IA16 – AC input modules
• 1794-OA8, 1794-OA8I, 1794-OA16 – AC output modules
• 1794-IB8, 1794-IB16XT, 1794-IB10XOB6 – DC input/combo
• 1794-OB8, 1794-OB8EP, 1794-OB16 – DC output modules
• Full compatibility with over 30 Flex I/O modules – refer to the manual.

Electrical & Environmental Ratings

• Voltage Rating: 120V AC / 125V DC (max 132V AC)
• Current Capacity: 10 Amperes (continuous)
• FlexBus Draw: 640 mA @ 5V DC
• Isolation: 125V continuous (basic insulation type)
• Temperature Code: T4A (North America) / T4 (IEC)
• Certifications: c‑UL‑us, UL, CSA, CE

Wiring & Terminal Assignment

• Top strip (16 terminals): I/O signal connections (0–15).
• Middle strip (18 terminals): Voltage common (B‑16 to B‑33).
• Bottom strip (18 terminals): Supply voltage + (C‑34 to C‑51).
• Daisy‑chain support: use C‑34 (+) and B‑16 (-) for supply in, C‑51 (+) and B‑33 (-) for supply out.
• Use stranded copper wire (24‑16 AWG) for optimal performance.

Package Contents

• 1 x 1794-TB3 Flex I/O Terminal Base Unit
• Pre‑installed screw‑clamp terminal blocks
• Mounting hardware and DIN rail clips
• Quick‑start guide (printed)

Shipping & Logistics

• We ship via FedEx, UPS, or DHL – fast and trackable.
• All orders dispatch within 5 business days from our warehouse.
• We maintain plenty of stock – no long lead times.
• 30‑day return policy applies – hassle‑free process.

Frequently Asked Questions (FAQ)

• Q: Is the 1794-TB3 brand new and original?
  Yes, we supply only 100% genuine, brand‑new Allen‑Bradley units.
• Q: What is the maximum wire size for the terminals?
  It accepts 12 AWG (4 mm²) max and 22 AWG (0.35 mm²) min.
• Q: Can I daisy‑chain multiple terminal bases?
  Yes, the 1794-TB3 supports daisy‑chaining for power distribution.
• Q: What is the operating temperature range?
  -20 °C to 70 °C (-4 °F to 158 °F) at 5‑95% humidity (non‑condensing).
• Q: How long does delivery take?
  We ship within 5 days via FedEx, UPS, or DHL – delivery varies by region.
• Q: Is the 1794-TB3 compatible with 1794-OW8?
  Yes, it fully supports 1794-OW8 and all listed Flex I/O modules.

Contact Information

• For inquiries, please email sales@nex-auto.com or call +86 153 9242 9628.
• Partner: NexAuto Technology Limited