1794-TB3G Allen-Bradley Flex I/O Terminal Base Unit

1794-TB3G Flex I/O Terminal Base Unit by Allen-Bradley

Key Technical Specifications

• Manufacturer: Allen‑Bradley
• Part Number: 1794-TB3G
• Supply Voltage Range: 31.2V DC/AC, 50/60Hz, 10A (max)
• Backplane Current Draw: 640 mA @ 5V DC
• Terminal Configuration: 36 I/O terminals + 2 common + 2 voltage + 10 chassis ground
• Wire Size: 0.21 – 1.3 mm² (24–16 AWG) stranded copper, 75°C rated
• Insulation Thickness: 1.2 mm (3/64 in) minimum
• Screw Torque: 0.56–0.79 Nm (5–7 lb‑in)
• Isolation Voltage: 50V continuous (basic insulation, tested at 2121V DC for 60s)
• Dimensions: 94 x 94 x 69 mm (H x W x D)
• Operating Temperature: -20 °C to 70 °C (-4 °F to 158 °F), no de‑rating required
• Storage Temperature: -40 °C to 85 °C (-40 °F to 185 °F)
• Humidity: 5–95% non‑condensing (operation and storage)
• Shock & Vibration: 30G shock, 5G vibration (10–500 Hz)

Installation & Mounting Guide

• Mount the 1794-TB3G on a standard DIN rail for quick and secure installation.
• For permanent setups, use panel mounting as an alternative method.
• Hook the base over the top of the rail and slide it against the adjacent adapter.
• Push downward until the base locks firmly onto the DIN rail.
• Ensure the FlexBus connector engages properly with the host module.
• Use the grounded screw‑clamp terminals to connect field wiring with confidence.

Terminal Assignment & Wiring Details

• I/O terminals (36 points): connect input or output signals from field devices.
• Common terminals (2 points): provide shared return paths for circuits.
• Voltage terminals (2 points): distribute 24V DC/AC power to the module.
• Chassis ground terminals (10 points): offer dedicated grounding for noise reduction.
• Use 0.21–1.3 mm² stranded copper wire with 1.2 mm insulation for best results.
• All terminals use screw‑clamp technology for vibration‑resistant connections.

Environmental & Safety Ratings

• Voltage Rating: 24V AC/DC (max 31.2V)
• Current Capacity: 10 Amperes (continuous)
• FlexBus Draw: 640 mA @ 5V DC
• Isolation: 50V continuous (basic insulation, 2121V DC test)
• Temperature Code: T4A (North America) / T4 (IEC)
• Certifications: c‑UL‑us, CSA
• Functions without derating across the full operating temperature range.

Frequently Asked Questions (FAQ)

• Q: Is the 1794-TB3G a genuine Allen‑Bradley product?
  Yes, we supply 100% original, brand‑new units direct from Rockwell Automation.
• Q: What is the maximum wire gauge for this base?
  It accepts 16 AWG (1.3 mm²) max and 24 AWG (0.21 mm²) min with 1.2 mm insulation.
• Q: Does this base support both DIN rail and panel mounting?
  Yes, the 1794-TB3G supports both installation methods.
• Q: What are the operating and storage temperature limits?
  Operation: -20 °C to 70 °C; Storage: -40 °C to 85 °C – no derating needed.
• Q: How quickly do you ship orders?
  We ship within 5 days via FedEx, UPS, or DHL – delivery varies by region.
• Q: What does the "G" in 1794-TB3G indicate?
  The "G" denotes grounded screw‑clamp terminals for enhanced noise immunity.

Contact Information

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