Configured for physical wiring termination and overcurrent fuse protection of 16 digital or analog I/O channels, the Allen-Bradley 1794-TBNF (1794-TBNF Fused Terminal Base) provides direct physical/electrical execution within distributed FLEX I/O control systems. The hardware acts as the primary mounting infrastructure, routing field electrical currents directly to the active module interface while establishing local circuit protection boundaries.

Functional Coding Profile

• 1794: Catalog series designation for the modular distributed FLEX I/O platform.

• TB: Terminal Base structural hardware platform.

• N: Narrow/compact chassis connection geometry.

• F: Integrated individual fuse holders for channel protection.

Hardware Specifications

Backplane Integration & Density Scaling

The device features an integrated side-mounted pass-through plug assembly that establishes electrical connections between the host adapter and the distributed network infrastructure. Field measurements are converted locally and broadcast across Profinet / EtherNet/IP deterministic networks without drawing upon additional backplane bus communication velocity licenses. The passive backplane plane architecture ensures seamless I/O density scaling while maintaining full firmware flash compatibility for all mounted operational processing modules.

Logistics Packaging Contents

• 1 Allen-Bradley 1794-TBNF Fused Terminal Base

• 1 Terminal Marker Identification Strip

• 1 Base Interlock Protection Insert

Field Installation Guidelines

• Mechanical Rail Alignment

  Snap the base assembly horizontally onto a standard 35 mm DIN rail. Slide the unit securely to the left to fully mate the side-locking bus connectors.

• Terminal Screw Tensioning

  Strip conductor wires (22 to 12 AWG) to a standard depth of 10 mm. Secure each conductor within the terminal screw clamps, tightening to the specified torque rating.

• Fuse Socket Allocation

  Insert appropriate fast-acting or time-delay industrial fuses into the designated front-facing sockets to match specific field circuit overload parameters.

Frequently Asked Questions

• Does this passive base assembly require internal logic programming or a firmware flash update?

  No, this component functions as a passive electrical termination unit and does not contain any microprocessor firmware or software logic registers.

• Can active operational modules be safely hot-swapped while this base is powered?

  Yes, the terminal base design permits the insertion and removal of compatible I/O modules while the underlying system backplane remains active.

• What is the absolute continuous current rating for each individual fuse circuit terminal path?

  The terminal base is structurally rated to handle a maximum continuous current distribution ceiling of 10 A across its passive bus line.

• Does this device consume any data throughput allocations or backplane bus communication velocity licenses?

  No, because it does not contain an active processing chipset, it operates independently of software communication velocity licenses.

• What happens if a different functional module is inserted into this terminal base slot accidentally?

  A physical keyswitch on the base must be turned to match the specific structural coding of the target module to prevent incorrect insertion.

• What is the continuous electrical isolation capability between the terminal arrays and backplane connections?

  The internal routing tracks are designed to maintain galvanic and physical isolation parameters up to a maximum rating of 250 VAC / VDC.

• Can the base accommodate different sizes of stranded wire conductors simultaneously within the same clamp?

  The internal screw clamps are designed to secure single solid or stranded conductors spanning from 22 AWG down to 12 AWG per node.

• How is electrical ground continuity established for the field instrument shields?

  Instrument shield drain wires must be routed to an independent internal copper ground busbar within the primary system cabinet enclosure.