Allen-Bradley 1756-TBSH Spring Terminal Block – ControlLogix 1756 Series
When a ControlLogix I/O module loses its field-wiring interface, the entire control loop goes dark. Sensors stop reporting, actuators lose command signals, and production lines halt — sometimes without a clear fault code to guide the maintenance team. The 1756-TBSH spring terminal block is the critical last-mile connector between your field devices and the ControlLogix backplane, and its absence or failure is never a minor inconvenience on the plant floor.
The Allen-Bradley 1756-TBSH is a 20-pin spring-clamp terminal block designed exclusively for the ControlLogix 1756 series I/O modules. Within Rockwell Automation’s broad portfolio of wiring accessories, the TBSH variant occupies the premium tier: its tool-free spring-clamp termination mechanism eliminates the torque variability that plagues screw-type blocks, making it the preferred choice for high-vibration environments and installations where long-term connection integrity is non-negotiable. Globally, the ControlLogix platform powers critical infrastructure across automotive, oil & gas, food & beverage, and semiconductor manufacturing — and the 1756-TBSH is the wiring backbone that keeps those systems running.
Technical Specifications
- Part Number: 1756-TBSH
- Catalog Prefix: AB / Allen-Bradley (Rockwell Automation)
- Series: ControlLogix 1756
- Terminal Type: Spring-clamp (tool-free insertion)
- Pin Count: 20 pins
- Compatible Module Form Factor: 1756 series I/O modules with 20-pin RTB interface
- Weight: 140 g
- Mounting: Direct plug-in to compatible 1756 I/O module RTB connector
- Wiring Method: Spring-clamp termination (TBSH) — no screwdriver required
- RoHS Compliance: Refer to Rockwell Automation product certification documentation
Note: All specifications are sourced from Rockwell Automation official documentation. Contact Konmask.com for the latest revision data sheet.
Key Features & Benefits
- Tool-Free Spring Termination: The spring-clamp design allows conductors to be inserted and secured without a screwdriver, dramatically reducing installation time and eliminating under- or over-torque errors that cause intermittent faults.
- Vibration-Resistant Connection: Spring-clamp contacts maintain consistent clamping force under mechanical vibration, making the 1756-TBSH ideal for press rooms, compressor skids, and mobile equipment panels.
- Hot-Swap Ready: Designed to support ControlLogix’s live-insertion capability — field wiring can be disconnected and reconnected without powering down the I/O module, minimizing process interruption during maintenance.
- 20-Pin Density: Accommodates the full I/O channel count of compatible 1756 modules in a compact footprint, keeping panel layouts clean and cable management straightforward.
- OEM-Grade Reliability: Manufactured to Rockwell Automation’s stringent quality standards, ensuring compatibility and long service life in 24/7 continuous-process environments.
- Direct Replacement: Drop-in replacement for worn or damaged terminal blocks on existing 1756 I/O modules — no re-engineering required.
Industry & Equipment Applications
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, and powertrain assembly cells running ControlLogix PLCs.
- Oil & Gas: Wellhead control panels, pipeline SCADA RTUs, and compressor station automation where vibration resistance is critical.
- Food & Beverage: Filling lines, pasteurization systems, and packaging machines requiring frequent washdown and maintenance access.
- Semiconductor & Electronics: Cleanroom process equipment and wafer-handling systems with strict uptime requirements.
- Water & Wastewater: Pump station control panels and SCADA-integrated treatment plant automation.
- Discrete Manufacturing: Any production cell using Allen-Bradley 1756 I/O modules for digital or analog field-device interfacing.
System Integration & Compatible Parts
The 1756-TBSH is part of the broader ControlLogix 1756 wiring accessories ecosystem. Commonly paired components include:
- 1756-IB16 / 1756-OB16E — 16-channel digital I/O modules using 20-pin RTB interface
- 1756-IF8 / 1756-OF8 — Analog I/O modules compatible with spring-clamp terminal blocks
- 1756-TBS6H — 36-pin spring terminal block for higher-density modules
- 1756-TBCH — 20-pin cage-clamp variant (screw-type alternative)
- 1756-BP / 1756-A series — ControlLogix chassis and backplanes
- 1756-L series CPUs — ControlLogix controllers (L71, L73, L85, etc.)
When sourcing replacement terminal blocks, always verify the pin count and termination style (spring vs. cage-clamp) against your specific I/O module catalog number.
Our Quality Assurance Process
- Source Verification: All Allen-Bradley components are sourced from authorized distributors or verified surplus channels with full traceability documentation.
- Visual & Mechanical Inspection: Each unit is inspected for physical integrity — connector pins, spring-clamp mechanisms, housing condition, and label legibility — before dispatch.
- Authenticity Checks: Holographic labels, date codes, and part markings are cross-referenced against Rockwell Automation’s published standards to screen for counterfeit parts.
- Secure Packaging: Components are packed in anti-static, cushioned packaging to prevent transit damage to the spring-clamp contacts.
- Documentation: Certificate of conformance and inspection records available upon request for MRO and OEM procurement teams.
How to Order
- Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity and delivery timeline.
- Receive a Quote: Our team will respond within 1 business day with pricing, lead time, and availability confirmation.
- Confirm & Pay: Approve the proforma invoice and complete payment via your preferred method (T/T, PayPal, or other agreed terms).
- Shipping & Tracking: Orders are dispatched via DHL, FedEx, or UPS Express with full tracking. Export documentation provided for international shipments.
- After-Sales Support: Our technical team is available post-delivery to assist with installation questions or compatibility verification.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and automation hardware — our team speaks the language of control engineers, not generalist resellers.
- Global Reach, Local Expertise: Serving customers across North America, Europe, Southeast Asia, and the Middle East with competitive lead times and export-compliant documentation.
- Hard-to-Find Parts: We stock and source obsolete, long-lead, and high-demand components that mainstream distributors cannot supply on short notice.
- Transparent Sourcing: Full traceability on every part — we disclose the supply chain so your procurement team can make informed decisions.
- Responsive Technical Support: Pre-sale compatibility checks and post-sale installation guidance from engineers who understand ControlLogix architecture.
Frequently Asked Questions
Q: What is the difference between the 1756-TBSH and the 1756-TBCH?
A: Both are 20-pin terminal blocks for the same ControlLogix I/O modules. The 1756-TBSH uses a spring-clamp (tool-free) termination, while the 1756-TBCH uses a cage-clamp (screw) termination. Spring-clamp is preferred in high-vibration environments; cage-clamp is common in standard panel builds where torque verification is part of the commissioning process.
Q: Is the 1756-TBSH compatible with all 1756 I/O modules?
A: No — it is designed for 1756 I/O modules with a 20-pin RTB (Removable Terminal Block) interface. Modules requiring 36-pin blocks (e.g., 1756-TBS6H) are not compatible. Always verify the RTB pin count in your module’s installation instructions before ordering.
Q: Can I replace the terminal block while the I/O module is powered?
A: ControlLogix supports live-insertion of I/O modules, and the RTB is designed to be disconnected from a powered module. However, always follow your site’s safety procedures and the relevant Rockwell Automation safety guidelines before performing any live-wiring work.
Q: Do you provide a certificate of conformance?
A: Yes. A certificate of conformance and inspection report are available upon request. Please specify this requirement when submitting your inquiry.
Q: What is the lead time for the 1756-TBSH?
A: Lead time depends on current stock levels. Contact us at support@konmask.com or call +0086 19859288691 for real-time availability.
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