Allen-Bradley 1756-TBNH ControlLogix Terminal Block

Allen-Bradley 1756-TBNH ControlLogix 20-Position Screw-Terminal Block is a removable terminal block (RTB) with a 20-position NEMA screw-clamp interface for ControlLogix I/O modules. It provides a dedicated terminal point for each of the 20 I/O signals on compatible 1756 modules, enabling field wiring through screw terminals that secure with torque specified at 0.8–1 N·m (7–9 in-lb). The RTB design allows installation and removal without disturbing the mounted I/O module, aiding maintenance and reconfiguration in ControlLogix-based systems. Manufactured by Allen-Bradley (Rockwell Automation), this 20-pin block is used to route sensors, actuators, and other field wiring to the corresponding I/O points in a ControlLogix chassis, supporting robust, organized wiring in industrial automation applications. It is part of the ControlLogix RTB family and is commonly paired with 1756 I/O modules to simplify wiring schemes and improve reliability in harsh environments.