Overview
The Allen-Bradley 1794-TBN is a standard Flex I/O terminal base unit engineered for signal distribution and wiring termination in distributed I/O systems. This Series A module provides a proven, rugged foundation for FLEX I/O adapter and scanner modules, supporting up to 16 I/O connection points with robust screw clamp terminals rated for 10A continuous current at 250V AC/DC.
Key Features
- 16 I/O terminals with 2 common and 2 +voltage dedicated terminals
- NEMA style screw clamp termination for 22–12 AWG solid or stranded wire
- 10A continuous current capacity at 250V AC/DC, 50/60 Hz
- DIN rail and panel-mount design with open-style enclosure
- FLEXBUS 5V DC, 640mA internal supply
- UL, CSA, CE certified; ATEX/IECEx hazardous location compatible (Class I, Division 2)
Technical Specifications
- Voltage Rating: 250V AC/DC, 50/60 Hz
- Maximum Current (I/O): 10A continuous
- Terminal Type: Screw clamp (NEMA style)
- I/O Count: 16 terminals (configurable signal/power)
- FLEXBUS Supply: 5V DC, 640mA
- Isolation Voltage: 250V continuous
- Wire Size Range: 22–12 AWG (0.34–3.3 mm²) solid or stranded, 75°C rated insulation
- Terminal Torque: 1.4 Nm (12 lb-in)
- Mounting: DIN rail and panel mount
- Operating Temperature: 0–55°C (32–131°F)
- Enclosure Style: Open (no cover)
- Dimensions: 94 × 94 × 69 mm
- Weight: 150 g
- Certifications: UL, CSA, CE, C-TICK, GOST, KC, MARINE; ATEX II 3 G / IECEx
Typical Applications
- Factory automation and discrete process control
- Motor control and pump station wiring hubs
- Sensor signal distribution in packaging and materials handling
- Hazardous location installations (Class I, Div 2 with appropriate scanner/adapter)
- Retrofit and modernization of legacy distributed I/O panels
Compatibility & Replacements
The 1794-TBN is designed to work with all standard FLEX I/O scanner and adapter modules (1794-AENT, 1794-ASPC, 1794-ACN15, etc.) and supports the native FLEXBUS protocol. Direct substitutes include the 1794-TBNK (conformal coated version for harsh environments) and 1794-TBNF (foil-shielded for EMI mitigation). Ensure module firmware and RSLogix 5000/Studio 5000 library support before installation. Compatible with Compact Logix, ControlLogix, and GuardLogix platforms via appropriate FLEX I/O adapters.
