Evaluating the 1756-TBCH for Your ControlLogix System
When building or maintaining a ControlLogix system, selecting the right removable terminal block (RTB) is critical for reliable field wiring. The Allen-Bradley 1756-TBCH offers a proven screw-clamp design that simplifies installation and reduces downtime.
Product Overview
The Allen-Bradley 1756-TBCH is a 36-pin cage-clamp removable terminal block with standard housing, designed for 1756 I/O modules. It provides a modular wiring interface between industrial plant wiring and ControlLogix modules, allowing you to pre-terminate wires and quickly swap modules without re-wiring.
Technical Specifications Breakdown
Key parameters for the 1756-TBCH are listed below for quick reference:
| Feature | Specification |
|---|---|
| Part Number | 1756-TBCH |
| Brand | Allen-Bradley |
| Series | ControlLogix |
| Clamp Type | Screw-Clamp |
| Pins | 36-Pin Connection |
| Screw Torque | 0.5 Nm (4.4 lb/in) |
| Single Wire Connection | 0.33 to 2.1 mm² (22…14 AWG) |
| Double Wire Connection | 0.33 to 1.3 mm² (22…16 AWG) |
| Wire Type | Solid or Stranded Wire |
| Operating Temperature | 32-140 Fahrenheit (0-60 Celsius) |
| Weight | 0.3 pounds (0.1 kilograms) |
| Dimensions | 5.51 x 4.41 x 5.71 inches |
Industry Applications
Its 36-pin capacity supports high-density wiring, reducing panel space. For example, in a packaging line, the 1756-TBCH enables quick module swaps during changeovers, minimizing downtime.
Installation & Setup Guidance
Before installation, ensure the wire insulation is rated for 90 °C (194 °F) or greater with a maximum insulation diameter of 1.2 mm (3/64 in.). Use a 3.2 mm (1/8 in.) screwdriver to tighten each terminal to 0.5 Nm (4.4 lb/in). For single wire connections, use 0.33 to 2.1 mm² (22 to 14 AWG) solid or stranded copper wire. For double wire connections, use 0.33 to 1.3 mm² (22 to 16 AWG). Do not terminate more than two conductors on any single terminal.
Maintenance & Reliability
Periodically inspect the terminal block for loose connections or signs of corrosion. The 1756-TBCH operates reliably in clean, dry industrial environments with a temperature range of 0 to 60 °C (32 to 140 °F). Ensure the module door can close fully after wiring to maintain protection.
Compatibility & Integration
The 1756-TBCH is compatible with most 1756 ControlLogix I/O modules, including 1756-IA16I, 1756-IB16D, 1756-IF8, and 1756-OB16IEF. It plugs directly into the front of the module and is hidden by the module door cover. Always verify module-specific RTB requirements in the user manual.
Selection Guide & Purchasing Advice
When selecting a terminal block, consider the number of I/O points and wire gauge. The 1756-TBCH supports up to 36 connections and accepts 22 to 14 AWG wire. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting & Common Issues
If you experience intermittent signals, check that each wire is fully inserted and the screw is tightened to 0.5 Nm. Loose connections can cause voltage drops. Ensure the RTB is fully seated on the module; a partial connection may cause communication errors. For persistent issues, inspect the module pins for damage.
Availability & Condition at AutoDCSTech
| Part Number | 1756-TBCH |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
