Allen-Bradley 1769-PA2 CompactLogix AC Power Supply 2A/0.8A

Allen-Bradley 1769-PA2 AC Power Supply 2A/0.8A – CompactLogix 1769 Series

When a CompactLogix rack loses its power supply, the entire control node goes dark — PLCs stop scanning, I/O modules drop their states, and the production line halts without warning. In process-critical environments such as automotive body shops, water treatment SCADA panels, or pharmaceutical batch reactors, an unplanned power interruption caused by a failed or undersized supply can cascade into hours of downtime and significant requalification effort. The 1769-PA2 is the component that prevents that scenario: a dedicated AC input power supply engineered specifically for the 1769 CompactLogix backplane, delivering stable, regulated DC bus power to every module in the rack.

Within the 1769 family, the PA2 occupies the mid-range power tier — above the entry-level PA4 (1A/0.5A) and below the high-density PB4 DC variant — making it the default choice for standard CompactLogix L3x and L4x controller builds with mixed digital and analog I/O. Rockwell Automation has shipped this module across hundreds of thousands of installed systems globally, and it remains one of the most specified power supplies in North American and European discrete manufacturing automation.

Technical Specifications

Electrical

• Input Voltage: 85–265 V AC, 47–63 Hz (universal input, auto-ranging)
• Output — 5 V DC Bus: 2 A continuous
• Output — 24 V DC Auxiliary: 0.8 A continuous
• Inrush Current: ≤ 20 A peak at 265 V AC
• Hold-up Time: ≥ 20 ms at full load
• Power Dissipation: ≤ 10 W typical

Mechanical

• Form Factor: 1769 single-slot, left-end mount
• Dimensions (H × W × D): 118 mm × 35 mm × 87 mm
• Weight: approx. 0.55 kg
• Connector: 1769 backplane edge connector + 3-pin AC terminal block
• DIN Rail / Panel Mount: compatible with standard 35 mm DIN rail

Environmental

• Operating Temperature: 0 °C to +60 °C (derating may apply above 55 °C)
• Storage Temperature: −40 °C to +85 °C
• Relative Humidity: 5–95% non-condensing
• Vibration: IEC 60068-2-6 compliant
• Shock: IEC 60068-2-27 compliant
• Pollution Degree: 2

Certifications & Standards

• UL Listed (UL 508)
• CE Marked (Low Voltage Directive 2014/35/EU)
• cUL Listed (CSA C22.2 No. 142)
• RoHS Compliant
• Meets IEC 61131-2 power supply requirements for programmable controllers

Key Features & Benefits

• Universal AC Input Range (85–265 V AC) — A single SKU covers both 110 V and 220 V plant environments, eliminating the need to stock separate part numbers for different facility voltages and reducing spare-parts inventory by up to 50% for multi-site operations.
• Dual-Rail Output (5 V / 24 V DC) — Simultaneously powers the 1769 backplane logic bus and provides 0.8 A of 24 V DC auxiliary current for field sensors or indicator circuits, removing the need for a separate auxiliary supply in many panel designs.
• ≥ 20 ms Hold-Up Time — Sustains output through brief AC line sags or interruptions, giving the CompactLogix CPU sufficient time to execute a controlled program shutdown and preserve data integrity rather than experiencing an abrupt power loss.
• IEC 61131-2 Compliant Design — Meets the international standard for PLC power supply performance, ensuring compatibility with global machine safety and functional safety assessments without additional derating calculations.
• Compact Single-Slot Footprint — At 35 mm wide, the PA2 consumes only one slot on the 1769 backplane, maximising the number of I/O slots available in space-constrained control panels.
• Plug-and-Play Backplane Integration — The edge-connector design requires no inter-module wiring; the supply is mechanically keyed to prevent incorrect installation, reducing commissioning time and the risk of wiring errors during field replacement.

Industry & Equipment Applications

• Automotive Manufacturing — Body-in-white welding cells, transfer line PLCs, and end-of-line test stations where continuous 24/7 operation demands a reliable, thermally stable power source.
• Food & Beverage Processing — Filling, capping, and labelling machines operating in washdown-adjacent environments; the PA2’s sealed backplane connection resists airborne moisture ingress.
• Water & Wastewater Treatment — Remote pump station RTU panels and SCADA outstations where universal AC input accommodates variable generator supply voltages during grid outages.
• Pharmaceutical & Life Sciences — Batch reactor control panels and clean-room HVAC systems requiring documented, traceable components for FDA 21 CFR Part 11 and GMP validation packages.
• Oil & Gas Upstream/Midstream — Wellhead control panels and pipeline compressor station PLCs where the wide temperature storage range (−40 °C) suits pre-commissioning storage in outdoor laydown yards.
• Material Handling & Logistics — Conveyor sortation systems, palletising robots, and automated storage/retrieval systems (AS/RS) where the compact footprint allows dense panel layouts in space-limited machine frames.

System Integration & Compatible Parts

Compatible CompactLogix Controllers (upstream): 1769-L31, 1769-L32E, 1769-L35E, 1769-L43, 1769-L45 — the PA2 is the factory-recommended power supply for all standard L3x/L4x builds drawing ≤ 2 A on the 5 V bus.

Compatible I/O Modules (downstream, same backplane): 1769-IQ16, 1769-OB16, 1769-IF4, 1769-OF4, 1769-ASCII, 1769-SDN — verify total 5 V bus current draw does not exceed 2 A before finalising the I/O configuration.

Equivalent / Replacement Considerations:

• 1769-PA4 — lower-capacity predecessor (1A/0.5A); suitable only for minimal I/O configurations. Not a drop-in replacement for PA2 in fully populated racks.
• 1769-PB2 — DC input variant (18–32 V DC, 2A/0.8A); functionally equivalent output but requires DC source; use when AC mains are unavailable.
• 1769-PB4 — DC input, higher capacity (4A/1.5A); over-specified for most PA2 applications but acceptable as an upgrade replacement.

Note: Always verify total backplane current budget using Rockwell’s System Power Calculator (available in Studio 5000 or the online configurator) before substituting power supply models.

Our Quality Assurance Process

Every 1769-PA2 unit shipped from Konmask.com passes a four-stage inspection protocol:

1. Visual & Mechanical Inspection — Housing integrity, connector pin condition, label legibility, and date-code verification against known production batches.
2. Functional Power-On Test — Unit is energised at 110 V AC and 220 V AC; output voltages (5 V DC and 24 V DC rails) are measured under load and compared against Rockwell’s published tolerances.
3. Backplane Communication Check — Module is seated in a live 1769 rack and scanned by a CompactLogix controller to confirm backplane identity and fault-free operation.
4. Packaging & Documentation Review — Anti-static packaging, serial number logging, and document pack assembly prior to dispatch.

Available documentation upon request: Inspection report, functional test data sheet, certificate of conformance (CoC), photos of actual unit, Rockwell Automation original datasheet reference.

How to Order

1. Submit Your Inquiry — Email support@konmask.com or use the contact form with your required quantity, delivery timeline, and destination country.
2. Receive Quotation — Our team will respond within 24 hours with pricing, lead time, available stock quantity, and shipping options (DHL / FedEx / sea freight for bulk orders).
3. Confirm & Ship — Upon order confirmation and payment, units are dispatched with full tracking and export documentation.

Why Choose Konmask.com?

• Specialist Industrial Focus — We stock exclusively PLC, DCS, and automation hardware; every team member has hands-on experience with control system components, not general electronics.
• Functional Test Before Shipment — Unlike brokers who ship untested surplus, every unit is powered on and verified in a live 1769 rack before leaving our facility.
• Transparent Traceability — We provide serial numbers, date codes, and inspection records so your maintenance team and auditors have a complete paper trail.
• Global Export Experience — We ship to 60+ countries with full commercial invoice, packing list, and country-of-origin documentation to support customs clearance.
• Responsive B2B Support — Dedicated account handling for MRO buyers, procurement teams, and system integrators; 24-hour quotation turnaround, 7 days a week.

Frequently Asked Questions

Q: Can the 1769-PA2 power supply be used as a direct replacement for the 1769-PA4 in an existing CompactLogix rack?
A: Yes, the PA2 is physically and electrically compatible with any 1769 backplane slot that accepts the PA4. Because the PA2 delivers twice the 5 V bus current (2 A vs. 1 A), it is a safe upgrade replacement. However, the reverse is not true — do not substitute a PA4 into a rack previously running a PA2 without first recalculating the total I/O current budget.

Q: What is the lead time for the Allen-Bradley 1769-PA2 and do you hold stock for urgent MRO orders?
A: We maintain buffer stock of the 1769-PA2 for urgent maintenance, repair, and operations (MRO) requirements. Standard orders typically ship within 1–3 business days. For large-quantity or project orders, contact us for a confirmed lead time and we will advise on availability from our supplier network.

Q: Is the 1769-PA2 compatible with CompactLogix L3x controllers used in CE-marked machinery sold into the European market?
A: Yes. The 1769-PA2 carries CE marking under the Low Voltage Directive (2014/35/EU) and meets IEC 61131-2 requirements, making it suitable for use in CE-marked machine control panels destined for the EU market. Ensure the overall panel design also complies with the Machinery Directive (2006/42/EC) and any applicable EN standards for your specific application.

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