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The 1756-TBNH is a 20-position removable terminal block used with Allen-Bradley ControlLogix 1756 series I/O modules. This component contains 20 individual wiring terminals that accept both solid and stranded copper conductors to complete electrical connections between field devices and the control system. The wiring channels of the 1756-TBNH accommodate wire sizes ranging from 22 to 14 AWG, with each terminal point allowing the simultaneous insertion of up to two conductors for field bridging and signal splitting. To secure the threaded connections and prevent wiring looseness caused by industrial field vibration, the screw-clamp structure specifies a physical fastening torque requirement of 1.36 N·m.
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For mechanical installation and routine field maintenance, the terminal block requires a screwdriver with a blade width of 8 mm or less, allowing technicians to perform wiring and assembly using standard industrial tools. Wires terminated into this component must carry a temperature rating of 90 degrees Celsius or higher to maintain electrical insulation compliance.
As a passive companion peripheral for the ControlLogix 1756 platform, the 1756-TBNH serves strictly as the physical wiring interface to facilitate functional expansion and circuit connection for the associated digital or analog I/O modules.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1756-TBNH TERMINAL BLOCK Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Power and Energy Industry
Connects electrical signals between generator sets, transformer monitoring sensors, and PLC I/O modules.
Oil and Gas Extraction Industry
Collects wiring from pressure and flow transmitters in long-distance pipeline compressor stations and wellhead control panels.
Automotive Manufacturing Industry
Connects digital signals of field limit switches and proximity switches inside control cabinets of body stamping, welding, and final assembly lines.
Metallurgy and Steel Industry
Serves as the physical electrical connection interface for temperature-rated copper conductors in high-temperature blast furnace and steel rolling control systems.
Chemical and Petrochemical Manufacturing Industry
Connects reactor pressure switches and temperature control loops inside explosion-proof enclosures and distributed control cabinets.
Pharmaceutical and Biotechnology Industry
Connects wiring for flow and temperature validation sensors inside control cabinets of cleanroom compounding systems and sterilizers.
When using the 1756-TBNH, the officially recommended screw tightening torque of 1.36 N·m must be strictly enforced to prevent wiring looseness caused by industrial vibration or thread stripping due to excessive force. A standard screwdriver with a blade width of 8 mm or less must be used for wiring.
Conductors must fall within the range of 22 to 14 AWG with a temperature rating of no less than 90 °C. Although this component supports online hot-swapping, the field environment and the energized load status of the module must still be verified before performing entire removal or mechanical keying adjustments to ensure the safety and stability of electrical connections.
1756-TBNH is a 20-position, low-profile screw-clamp RTB designed for Allen-Bradley ControlLogix I/O modules, supporting 22–14 AWG solid/stranded copper wires.
What are the basic specifications of the 1756-TBNH Terminal Block?
It provides secure wiring connections for 1756 I/O modules with standard industrial voltage and current ratings.
Which controllers or I/O modules is the 1756-TBNH compatible with?
It is compatible exclusively with Allen-Bradley ControlLogix 1756 series low-to-medium density (typically 8-point or 16-point) digital and analog I/O modules that feature a 20-pin front interface. It does not connect directly to the chassis backplane.
Can the 1756-TBNH Terminal Block be used in harsh industrial environments?
Yes, it is designed for industrial applications with durable construction and resistance to dust and vibration.
What are the installation guidelines for the 1756-TBNH Terminal Block?
Align and seat the RTB firmly onto the front electronic interface of the 1756 I/O module (not the chassis), tighten the center housing screws, follow specified wiring gauge limits (22–14 AWG), and ensure the clamp screws are torqued precisely to 1.36 N·m.
How does the 1756-TBNH differ from other terminal blocks in the 1756 series?
Unlike the 36-position high-density models (such as the 1756-TBCH), the 1756-TBNH is a 20-position standard-density block. Furthermore, it uses a screw-clamp mechanism for wire retention, distinguishing it from spring-clamp variations like the 1756-TBSH.
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