Overview
The Allen-Bradley 1794-TBN is a standard terminal base unit from the Flex I/O 1794 series, designed to provide secure I/O and power termination in distributed automation systems. This unit interfaces Flex I/O output modules with field wiring and supports both DIN rail and panel mounting configurations for flexible installation in industrial control cabinets.
Key Features
- 16 I/O Terminal Points: Includes 2 common terminals and 2 +voltage terminals for complete signal routing
- NEMA-Style Screw Clamps: Secure wire termination for 0.34–3.3 mm² (22–12 AWG) copper wire with 1.4 Nm (12 lb-in) terminal torque
- 250V AC/DC Rated: Handles up to 250V DC/AC at 50–60 Hz with 10A maximum current capacity
- Dual Mounting: Compatible with both DIN rail and panel-mount installations
- Open-Style Enclosure: Compact design suitable for in-cabinet applications
Technical Specifications
- I/O Connections: 16 I/O terminals, 2 common (COM), 2 +voltage (+V)
- Voltage Rating: 250V AC/DC at 50–60 Hz
- Maximum Current: 10A per terminal base
- FLEXBUS Supply: 5V DC at 640 mA
- Wire Size: 0.34–3.3 mm² (22–12 AWG) solid or stranded copper
- Insulation: 1.2 mm (3/64 in) maximum thickness, rated 75 °C (167 °F) or greater
- Operating Temperature: -20 to 70 °C (-4 to 158 °F)
- Storage Temperature: -40 to 85 °C (-40 to 185 °F)
- Dimensions: Approximately 94 × 94 × 69 mm
- Weight: 0.42 lb (0.19 kg)
- Termination Type: NEMA-style screw clamp
- Mounting Options: DIN rail, panel
- Isolation Voltage: 250V continuous (module-dependent)
- Certifications: CE, CSA, CUL, UL, C-TICK, GOST, KC, MARINE
Typical Applications
The 1794-TBN terminal base is ideal for:
- Distributed I/O systems in manufacturing and process control
- Machine automation and assembly line control
- HVAC and building automation termination points
- Industrial cabinet-mounted control wiring
- General-purpose industrial automation where signal isolation is required
Compatibility & Replacements
Compatible With
- Allen-Bradley Flex I/O 1794 series output modules (1794-OA8, 1794-OA8I, 1794-OW8, 1794-OW8XT)
- Rockwell Automation ControlLogix and CompactLogix systems with Flex I/O networking
- FLEXBUS distributed I/O networks
- Studio 5000 and RSLogix software environments
Replaces / Drop-In Replacement For
- 1794-TBN /A (original revision A00 and A01)
- Earlier Flex I/O terminal bases in retrofit applications (verify module compatibility)
Works With
- Studio 5000 Logix Designer (RSLogix 5000 / Studio 5000)
- FLEXBUS communication protocol
- EtherNet/IP networks (via Flex I/O gateway modules)
- Rockwell Automation industrial control systems
