Allen Bradley 1794-TBNF Flex I/O Fused Terminal Base

Product Description

The Allen-Bradley 1794-TBNF is a robust FLEX I/O terminal base designed for secure field wiring and modular control system flexibility. Engineered to provide reliable module mounting and safe electrical connections, it simplifies distributed control system installations. Moreover, its fused design ensures protection against overloads, safeguarding connected devices and wiring. Compact and DIN rail-mountable, the 1794-TBNF supports seamless integration into industrial automation panels while maintaining optimal space efficiency. Its versatile compatibility accommodates digital, analog, HART analog, and specialty I/O modules, making it a dependable choice for diverse industrial applications.

Key Features

• Fused Protection: Built-in fuses prevent damage from current overloads, enhancing system safety.

• Modular Flexibility: Supports up to 8 I/O modules per system for scalable distributed architecture.

• Secure Wiring: Screw clamp terminals ensure reliable, long-term field connections.

• Compact Design: Space-saving DIN rail mounting facilitates efficient panel layouts.

• Wide Compatibility: Works with FLEX I/O, FLEX Ex, and FLEX XT modules, including specialty I/O.

• Durable Construction: IP20-rated and NEMA-compliant for industrial reliability.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation (USA)

• Model: 1794-TBNF

• Product Type: Flex I/O Terminal Base (Fused)

• Weight: 0.44 lbs

• Terminal Screw Torque: 1.4 Nm

• Supply Voltage: 24V DC/AC, 120V DC/AC, 230V DC/AC, max 10 A

• Backplane Current Draw: 640 mA @ 5VDC

• Number of Terminal Strips: 2 (Top: I/O terminals / COM; Bottom: I/O terminals / +V)

• I/O Terminals: 16 terminals

• Common / Supply Terminals: 2 each

• Connection Type: Screw clamp

• Wire Size: 0.34–3.3 mm² (22–12 AWG)

• Isolation Voltage: 250V continuous max.

• Mounting: 35 mm DIN rail

Typical Applications

• Industrial automation distributed I/O systems requiring modular expansion.

• Process control panels demanding secure, fused connections for digital or analog signals.

• Integration with Allen-Bradley CompactLogix and ControlLogix controllers for robust system performance.

• Use in hazardous or high-demand electrical environments where circuit protection is critical.

FAQ

Q1: Can the 1794-TBNF be used with both AC and DC modules?
A1: Yes, it supports 24V DC/AC, 120V DC/AC, and 230V DC/AC modules.

Q2: How many I/O modules can be mounted on one 1794-TBNF terminal base?
A2: It can support up to 8 I/O modules in a single system.

Q3: Is daisy-chaining supported with this terminal base?
A3: No, daisy-chaining is not supported on the 1794-TBNF.

Q4: What wire sizes are compatible with the screw clamp terminals?
A4: Wire sizes from 0.34 mm² to 3.3 mm² (22–12 AWG) are supported.

Q5: What type of mounting does the 1794-TBNF use?
A5: It mounts easily on standard 35 mm DIN rails for compact panel installation.