Product Overview

The Allen-Bradley 1756-TBCH is a 36-position Removable Terminal Block (RTB) designed specifically for high-density ControlLogix I/O modules. It provides the critical interface between field wiring and the PLC hardware, allowing for seamless connection of sensors, actuators, and power sources. We supply this unit as 100% Brand New and Original in factory packaging. This component is essential for any 1756-series module requiring a 36-pin connection, ensuring a gas-tight, vibration-resistant termination for industrial environments.

Technical Specifications

Engineering Advantages

• Zero-Downtime Maintenance: The 1756-TBCH allows users to replace I/O modules without disconnecting a single field wire. Technicians simply unlock the RTB, swap the module, and re-seat the block, reducing Mean Time to Repair (MTTR) from hours to minutes.

• Mechanical Keying Protection: This terminal block supports mechanical keying to prevent accidental insertion into the wrong type of I/O module. This safeguard eliminates the risk of applying high-voltage signals to low-voltage logic circuits during maintenance.

• Superior Connection Stability: The cage clamp design applies constant pressure to the wire, which compensates for thermal expansion and mechanical vibration. Unlike standard screw terminals that may loosen over time, the 1756-TBCH maintains a low-resistance path in high-vibration machinery applications.

• High-Density Wiring Management: The low-profile housing organizes 36 distinct wires within a 35mm width. This density enables high-point-count I/O configurations while maintaining a clean, professional appearance inside the control panel.

FAQs

What is the difference between the 1756-TBCH and the 1756-TBS6H?

The 1756-TBCH uses a Cage Clamp (screw-actuated clamp) which requires a screwdriver to tighten the wire. The 1756-TBS6H uses a Spring Clamp (push-in style). Both feature 36 pins and fit the same modules, but the TBCH is preferred for applications where specific torque settings must be documented for compliance.

Which Allen-Bradley modules require the 1756-TBCH?

This RTB is required for high-density digital and analog modules, such as the 1756-IB32, 1756-OB32, and certain 1756-series analog modules. Standard 16-point modules typically use the 20-pin 1756-TBNH instead. Always check your I/O module's user manual to confirm pin count.

Can I reuse a 1756-TBCH when upgrading my PLC?

Yes, as long as the terminal block is in good physical condition and the new module supports 36-pin RTBs. However, we recommend inspecting the clamps for fatigue or oxidation. Given the critical role of the RTB, many engineers install a Brand New 1756-TBCH during system overhauls to ensure maximum connection reliability.

Does the 1756-TBCH include the housing?

Yes, this part number includes the 36-pin terminal block and the standard low-profile housing that protects the wiring and provides the locking latch for the I/O module.