Allen-Bradley 1756-TBS6H Removable Terminal Block – Obsolete ControlLogix Spare Part

Technical Dossier

Product Details And Specifications

Allen-Bradley 1756-TBS6H Removable Terminal Block – Obsolete ControlLogix Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The Allen-Bradley ControlLogix platform has been the backbone of process automation across heavy industry for over two decades. The 1756-TBS6H is not a peripheral accessory — it is the physical termination point between field wiring and the I/O module. Without it, the associated I/O card is non-functional, regardless of its own condition.

The alternative — replacing the I/O module with a current-generation equivalent — triggers a cascade of engineering work. Field wiring must be re-terminated. The I/O configuration in the Logix Designer project must be updated. Functional testing must be repeated. In a safety-instrumented or regulated environment, re-validation may be required. None of this is fast, and none of it is cheap.

Condition & Reliability Assurance

DriveKNMS applies a 5-step inspection protocol to all obsolete and legacy components before dispatch review:

• Step 1 – Visual and Physical Inspection: Housing integrity, terminal block locking mechanism, and spring-clamp condition are checked against OEM reference standards. Any unit with cracked housing or deformed terminals is rejected.
• Step 2 – Electrolytic Capacitor Assessment: Where applicable on associated electronics, capacitor aging indicators (bulging, leakage, ESR deviation) are evaluated. This is a primary failure mode in components stored beyond 10 years.
• Step 3 – Pin and Contact Corrosion Check: All 36 contact pins are inspected under magnification for oxidation, pitting, or contamination. Corroded contacts are a leading cause of intermittent I/O faults in legacy systems.
• Step 4 – Firmware / Label Verification: Catalog number, revision markings, and date codes are cross-referenced against Rockwell Automation documentation to confirm authenticity and revision compatibility.
• Step 5 – Functional Fit Test: Where test fixtures are available, the RTB is mated and de-mated with a compatible module to verify the locking mechanism and contact engagement meet specification.

Units that do not pass all five steps are not offered for sale.

Key Features for System Maintenance

Q: Is the 1756-TBS6H compatible with all 1756-series I/O modules?
A: No. The 1756-TBS6H is designed for specific 1756-series modules that use the 36-pin spring-clamp RTB format. Verify compatibility against your module's installation instructions or contact us with your module part number before ordering.