Industrial Automation Power Solution – Allen-Bradley 1771-A2B | PLC-5 Series
Where This Product Is Used
The Allen-Bradley 1771-A2B is a dedicated power supply module engineered for the 1771 I/O chassis platform, widely deployed across heavy industrial environments. Typical application sites include:
- Automotive Assembly Lines – Powers distributed I/O racks controlling robotic welding cells, conveyor indexing, and body-in-white transfer systems.
- Oil & Gas Processing Plants – Supplies stable DC power to remote I/O chassis in hazardous-area control panels managing pump stations and separator skids.
- Water & Wastewater Treatment – Sustains continuous operation of PLC-5 systems governing aeration blowers, chemical dosing, and SCADA telemetry nodes.
- Food & Beverage Packaging – Feeds I/O modules in high-humidity washdown environments where power stability is critical to line OEE.
- Pulp & Paper Mills – Supports legacy PLC-5 architectures managing digester controls, stock preparation, and winder drives.
- Mining & Minerals Processing – Provides reliable power to crusher control panels and conveyor protection systems in dusty, high-vibration settings.
Technical Specifications
- Part Number: 1771-A2B
- Series: Allen-Bradley 1771 I/O Chassis / PLC-5
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Module Type: I/O Chassis Power Supply
- Chassis Compatibility: 1771 Series I/O Chassis (4-slot, 8-slot, 12-slot, 16-slot)
- Input Voltage: 120/240 VAC, 50/60 Hz (auto-ranging)
- Output: Regulated DC backplane power for 1771 I/O modules
- Weight: 1,280 g (approx.)
- Mounting: Left-side chassis slot mount
- Certifications: UL Listed, CE Marked, CSA Certified
Why Engineers Specify This Model
- Proven Legacy Reliability – The 1771-A2B has accumulated decades of field hours in mission-critical installations; its failure modes are well-documented and manageable.
- Direct Drop-In Replacement – No firmware changes or chassis modifications required; swap and restore in minutes to minimize unplanned downtime.
- Broad Chassis Compatibility – A single SKU supports multiple 1771 chassis configurations, simplifying spare-parts inventory management.
- Stable Backplane Voltage – Tight output regulation protects sensitive analog and specialty I/O modules from voltage-induced drift errors.
- Cost-Effective MRO Strategy – Sourcing a tested surplus or refurbished 1771-A2B extends the economic life of existing PLC-5 infrastructure without a full migration project.
Complete System Bill of Materials
For a fully operational 1771 I/O chassis system, engineers typically specify the following alongside the 1771-A2B:
- 1771-A1B / 1771-A2B / 1771-A3B / 1771-A4B – 1771 I/O Chassis (4 / 8 / 12 / 16 slot)
- 1785-Lxx – PLC-5 Processor (e.g., 1785-L40, 1785-L80)
- 1771-IxD / 1771-OxD – Digital Input / Output Modules
- 1771-IFE / 1771-OFE – Analog Input / Output Modules
- 1771-WN – I/O Chassis Wiring Arm
- 1784-KTx – DH+ / Remote I/O Communication Interface Card
Compliance & Industry Standards
- UL 508 – Industrial Control Equipment
- IEC 61131-2 – Programmable Controllers: Equipment Requirements & Tests
- CE Directive 2014/35/EU (Low Voltage Directive)
- CSA C22.2 No. 142 – Process Control Equipment
- RoHS Compliant (where applicable to refurbished units)
Quality Assurance & Sourcing
Every 1771-A2B unit shipped from Konmask.com undergoes a structured inspection process:
- Visual inspection for physical damage, corrosion, and component integrity
- Functional power-on test verifying output voltage regulation within OEM specification
- ESD-safe handling and anti-static packaging throughout storage and fulfillment
- Traceable sourcing from authorized industrial surplus channels and OEM-certified distributors
- 30-day return window with documented test report available on request
How to Source This Part
Konmask.com maintains stock of the Allen-Bradley 1771-A2B for immediate dispatch. To place an order or request a formal quotation:
- Online: Add to cart directly from this page for standard orders
- Email RFQ: support@konmask.com – include quantity, required delivery date, and any test certification requirements
- Phone / WhatsApp: +0086 19859288691 (Mon–Fri, 09:00–18:00 CST)
- Lead Time: In-stock units ship within 1–2 business days; ETA provided at order confirmation
- Export: DDP / DAP terms available for international B2B buyers; HS Code 8537.10 applies
Application-Specific FAQ
Q: Is the 1771-A2B compatible with both 120 VAC and 240 VAC input?
A: Yes. The 1771-A2B accepts auto-ranging AC input (120/240 VAC, 50/60 Hz), making it suitable for both North American and international installations without hardware modification.
Q: Can I use the 1771-A2B in a 1771-A4B 16-slot chassis?
A: Yes, provided the total I/O module current draw does not exceed the power supply’s rated output capacity. Verify the chassis power budget using Rockwell’s I/O chassis power calculator before installation.
Q: What is the difference between 1771-A2B and 1771-A2B Series B?
A: Series revisions typically reflect minor component or firmware updates. For most MRO replacement applications, either series is functionally interchangeable. Contact us if your application requires a specific series revision.
Q: Do you provide a test certificate with the unit?
A: A functional test report is available upon request at no additional charge. Please specify this requirement in your RFQ or order notes.
Q: What is the typical lead time for bulk orders (>5 units)?
A: Bulk availability is confirmed at the time of inquiry. Submit an RFQ to support@konmask.com for a firm lead time and volume pricing.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
