Allen-Bradley 1769-PA4 Power Supply – Obsolete CompactLogix Spare Part

Technical Dossier

Product Details And Specifications

Allen-Bradley 1769-PA4 Power Supply – Obsolete CompactLogix 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 1769-PA4 is the backbone power module for a generation of CompactLogix installations deployed across discrete manufacturing, food & beverage, water treatment, and material handling lines throughout the 2000s and 2010s. These systems were engineered for 20-year service lives. The hardware outlasted the supply chain.

Rockwell Automation's end-of-life notice for the 1769-PA4 left thousands of facilities in a difficult position: continue operating aging but functional automation infrastructure, or absorb the capital expenditure of a platform migration that delivers no immediate production gain. For most plant managers operating under tight maintenance budgets, the calculus is straightforward — keep the existing system running as long as the hardware can be sourced.

How to extend your CompactLogix asset life by 5–10 years at low cost:

Condition & Reliability Assurance

Sourcing discontinued industrial hardware from the secondary market carries legitimate quality concerns. DriveKNMS applies a structured 5-step inspection protocol to every 1769-PA4 unit before it is offered for sale:

1. Visual and mechanical inspection. Housing integrity, connector pin condition, and label verification against the declared part number.
2. Electrolytic capacitor assessment. Capacitor aging is the primary failure mode in power supplies of this vintage. Units showing visible bulging, electrolyte leakage, or ESR readings outside tolerance are rejected.
3. Pin and terminal corrosion check. Backplane connector pins are inspected under magnification. Oxidation or corrosion that could cause intermittent contact is cause for rejection.
4. Firmware version verification. Where applicable, firmware revision is documented and disclosed to the buyer prior to shipment.
5. Functional power-on test. Output voltage and current capacity are verified under load before units are cleared for sale.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

Key Features for System Maintenance

• Drop-in replacement. The 1769-PA4 installs directly into existing 1769 backplane slots. No wiring changes, no chassis modifications.
• No reprogramming required. The power supply module carries no user-configurable logic. Replacement does not affect PLC program integrity or I/O mapping.
• Avoids engineering re-scoping. A like-for-like swap is a maintenance event. A platform migration is a capital project. The 1769-PA4 keeps the decision in the maintenance budget.
• Preserves validated process configurations. For regulated industries — pharmaceutical, food processing, water utilities — maintaining the existing validated control architecture avoids revalidation costs that can exceed the hardware cost by an order of magnitude.

Can you source other 1769-series modules?
Yes. DriveKNMS specializes in the full Allen-Bradley 1769 Compact I/O range, including digital and analog I/O modules, communication adapters, and end caps. Contact us with your full BOM if you are conducting a broader spare parts audit.