PLC 1756-TBNH 20-position removable terminal block

Description

The PLC 1756-TBNH provides the field wiring connection point between external devices and the I/O module, allowing input and output signals to be connected through a detachable screw terminal interface. The terminal block uses a NEMA screw-clamp design and is mounted on the front of the ControlLogix I/O module. With its removable structure, the 1756-TBNH allows field wiring to remain connected when the terminal block is separated from the module, which simplifies module replacement and maintenance work in existing control systems. The 1756-TBNH provides 20 pin connections for industrial wiring applications and supports connection requirements commonly found in ControlLogix installations. The screw-clamp termination method allows wires to be secured directly at the terminal position, providing a practical interface for signal connection in automation panels and control cabinets.

Parameter

Model: 1756-TBNH 20-position removable terminal block
Backplane Current (5Volts): 1,200 milliamps
Backplane Current (24 Volts): 2.5 milliamps
Power Dissipation (Max): 6.19 Watts
Wire Size: 20 AWG
Operating Temperature: 32-140 Fahrenheit (0-60 Celsius)
Wire Size Capacity (Solid/Stranded): 0.33 mm² to 2.1 mm² (22 AWG to 14 AWG) max

Frequently asked questions

Q:Can the 1756-TBNH be removed during maintenance?
A:Yes. As a removable terminal block, the 1756-TBNH can be separated from the I/O module, which helps simplify module replacement and maintenance procedures without removing every field connection.

Q:How many terminals are available on the 1756-TBNH?
A:The terminal block provides 20 pin positions, allowing multiple field wiring connections to be made through a single removable interface.

Q:Where is the 1756-TBNH installed?
A:The 1756-TBNH is installed on the front of compatible 1756 ControlLogix I/O modules. The removable terminal block connects the module terminals with the plant wiring system.

Application areas

• Power Distribution and Interlocking: Configured in automation systems to terminate field power supplies, line filters, and safety interlocking contacts directly to the corresponding input or output channels.
• Control Cabinet Marshaling: Installed inside industrial control panels and motor control centers (MCCs) where structured, point-to-point terminations are required between field terminal strips and the local PLC rack.
• Removal and Insertion Under Power (RIUP): Enables maintenance personnel to separate the terminal block from the I/O module while keeping all field wiring intact. This allows live module replacement without powering down the entire system or disconnecting individual wires.

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