Allen‑Bradley 1756‑TBNH/A 20‑Position Screw‑Clamp Removable Terminal Block for ControlLogix I/O Module

Product Description

1756‑TBNH/A is A‑revision removable terminal block (RTB) for Rockwell ControlLogix 1756‑series I/O modules. It adopts NEMA‑standard screw‑clamp terminal structure, directly plugs onto the 

front face of compatible 1756 I/O cards, realizing physical connection between field instrument cables and PLC I/O channels. Detachable RTB design allows field wiring pre‑assembly, convenient for 

module replacement without removing field wires. Widely used in manufacturing, water‑treatment, metallurgy and power‑plant ControlLogix PLC control cabinets.

3. Technical Specifications

• Full Model: 1756‑TBNH/A
• Brand: Allen‑Bradley (Rockwell Automation), Origin: Mexico
• Series: ControlLogix 1756 PLC system
• Terminal Count: 20‑position NEMA screw‑clamp terminals
• Recommended Screw Torque: 1.36 Nm
• Screwdriver Requirement: 8 mm (5/16 inch) flat‑blade screwdriver
• Applicable Wire: 0.33‑2.1 mm² (22‑14 AWG) solid / stranded copper wire, 90℃ rated insulation
• Installation: Plug‑in to front of compatible 1756 I/O module
• Operating‑Temperature: 0℃ ~ +60℃
• Storage‑Temperature: ‑40℃ ~ +85℃
• Ambient Humidity: 5%‑95% non‑condensing industrial‑grade
• Net Weight: Approx. 0.136 kg
• Dimension: 134.11 × 54.1 × 44.96 mm

• Certifications: UL Listed, CE, industrial EMC certification

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4. Key Features

1. 20‑position NEMA screw‑clamp removable terminal block, dedicated for ControlLogix 1756 I/O modules
2. Detachable RTB structure, pre‑wire on bench, replace I/O module without disconnecting field cables
3. Standard screw‑clamp terminals guarantee stable contact for long‑term industrial vibration environment
4. Clear terminal number marking, easy field wiring inspection and troubleshooting
5. Compact plug‑in form factor, no extra cabinet mounting space required
6. Strict wire‑gauge specification supports common industrial field copper‑cable sizes
7. A‑hardware revision, backward compatible with most 1756 I/O modules supporting TBNH series RTB
8. Factory standardized test, reliable accessory for continuous‑run PLC automation systems