Allen-Bradley 1746-P1 Power Supply – Obsolete SLC 500 Spare Part

Technical Dossier

Product Details And Specifications

Allen-Bradley 1746-P1 Power Supply – Obsolete SLC 500 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

Note: Electrical parameters such as input voltage range and output current ratings are not listed here to avoid inaccuracy. Please contact us directly for verified datasheet documentation.

Solving the Discontinued Hardware Crisis

The Allen-Bradley SLC 500 platform was the backbone of North American and global discrete manufacturing automation from the late 1980s through the 2000s. Tens of thousands of SLC 500 installations remain in active production service today — in automotive stamping lines, food and beverage packaging, water treatment facilities, and chemical processing plants. Rockwell Automation has formally discontinued the SLC 500 product line, including the 1746-P1 power supply, and no longer provides manufacturing support or new inventory.

The power supply is the single most failure-prone module in any PLC chassis. It operates continuously under thermal and electrical load, and its electrolytic capacitors degrade over time regardless of usage cycles. A failed 1746-P1 does not merely halt one machine — it halts every I/O module seated in that chassis. In a just-in-time production environment, that means the entire line stops.

The 1746-P1 is not interchangeable with higher-wattage SLC 500 power supplies such as the 1746-P2 or 1746-P4 without verifying chassis load calculations. Substitution without engineering review is a documented cause of field failures. DriveKNMS supplies the correct part number — not a substitute — to eliminate that risk.

Condition & Reliability Assurance

Every 1746-P1 unit processed through DriveKNMS undergoes a structured five-step inspection protocol before it is offered for sale:

• Step 1 – Visual and Mechanical Inspection: Housing integrity, connector pin condition, and label verification against the original Rockwell Automation part number.
• Step 2 – Electrolytic Capacitor Assessment: Capacitor bodies are inspected for bulging, leakage, and electrolyte residue — the primary failure mode in aged power supply modules.
• Step 3 – Pin and Terminal Corrosion Check: All backplane connector pins and terminal blocks are examined under magnification for oxidation, pitting, and mechanical deformation.
• Step 4 – Firmware and Label Version Verification: Where applicable, firmware revision markings are documented and cross-referenced against known compatible SLC 500 processor firmware versions.
• Step 5 – Functional Bench Test: Units are powered and output stability is verified prior to packaging.

Units that do not pass all five steps are not offered for sale. Condition grade (New Surplus, Refurbished, or Used-Tested) is disclosed on every order confirmation.

Key Features for System Maintenance

Q: Can the 1746-P1 be repaired rather than replaced?
A: Board-level repair is technically possible but requires specialized capacitor replacement and calibration equipment. For most facilities, the labor cost of repair exceeds the cost of a tested replacement unit. DriveKNMS recommends replacement over repair for production-critical applications.