Purchase now: Allen-Bradley 1756-TBSH ControlLogix 20-Point Spring Terminal Block
Atlantechdrives provides you the 1756-TBSH, a 20-pin Removable Terminal Block (RTB) that utilizes spring-clamp technology for the ControlLogix 1756 platform. This module offers a modern, high-speed alternative to the traditional screw-type terminal blocks, specifically designed for applications where vibration resistance and reduced installation time are paramount.
- Pin Count: 20 Points
- Terminal Type: Spring Clamp
- Wire Gauge Range: 22 AWG to 14 AWG
- Compatibility: All standard 20-pin 1756 I/O modules
- Isolation: Backplane-to-field isolation maintained
Technical Superiority: Why Choose Spring Clamps?
The 1756-TBSH is engineered for reliability in environments characterized by continuous vibration, such as on-machine mounting, marine applications, or high-speed manufacturing lines. Unlike screw terminals, which can loosen over time due to mechanical stress or thermal expansion and contraction, the spring clamp in the 1756-TBSH provides a constant, self-adjusting tension on the conductor. This ensures a permanent, gas-tight connection that minimizes electrical noise and signal loss. The time required for wiring a 1756-TBSH is estimated to be up to 50% less than a standard screw block, making it the superior choice for high-volume cabinet builds and fast-track automation projects.
Installation Advice: Tool-less Efficiency and Wiring
To install wires in the 1756-TBSH, simply insert a small tool into the actuator slot to open the clamp, insert the wire, and release. For the best results, use wire with a stripped length of 10mm (0.4 in). While ferrules are optional, they are highly recommended to provide a clean, professional finish and to prevent loose strands from causing inter-pin shorts. When routing the wire bundle, utilize the side-exit channels of the 1756-TBSH housing to ensure the wires do not interfere with the chassis door or adjacent modules. Always perform a «tug test» on each wire after insertion to verify that the spring has firmly captured the conductor.
Maintenance and Hardware Reliability
Maintenance for the 1756-TBSH is remarkably simple. Because there are no screws to re-torque, maintenance cycles are reduced to a visual inspection of the wire integrity and the RTB latching mechanism. If a module needs to be replaced, the 1756-TBSH can be removed by simply pulling the top and bottom tabs, allowing the new module to be snapped in and the RTB re-attached in seconds. This ensures that the wiring remains undisturbed, preserving the original system validation. Keep the module faceplate clean; the 20 status LEDs on the I/O module are clearly visible through the 1756-TBSH housing, providing essential diagnostic data at a glance.
FAQs
Q: Can the 1756-TBSH handle 120V AC signals?
A: Yes, as long as the I/O module it is attached to is rated for that voltage (e.g., 1756-IA16).
Q: Does the 1756-TBSH come with the terminal housing?
A: Yes, it includes the 20-pin spring clamp block and the protective plastic housing cover.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
The 1756-TBSH spring-clamp interface streamlines the commissioning of field sensors connected to 1756-IB16 input cards.
