Allen-Bradley 1771-OB Digital DC Output Module – PLC-5 1771 I/O Series
When a digital output module fails mid-shift on the plant floor, the consequences cascade instantly: conveyor lines halt, robotic arms freeze mid-cycle, and safety interlocks trip the entire production cell offline. In a modern manufacturing facility, every unplanned minute of downtime can cost thousands of dollars in lost output, labor waste, and expedited logistics. The Allen-Bradley 1771-OB is the exact certified replacement your PLC-5 rack demands — same form, same fit, same function — with no re-engineering, no firmware conflicts, and no guesswork.
Within Rockwell Automation’s 1771 I/O platform, the 1771-OB holds a foundational position as the standard 16-point 24VDC transistor output module for PLC-5 control architectures. Though the PLC-5 family has reached end-of-life status with Rockwell, the installed base remains enormous across automotive, oil & gas, food & beverage, and heavy industry worldwide. The 1771-OB is consistently one of the highest-demand replacement modules in the global industrial automation MRO aftermarket, trusted by maintenance engineers and systems integrators across North America, Europe, and Asia-Pacific.
Technical Specifications
- Part Number / SKU: 1771-OB
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: 1771 PLC-5 I/O
- Module Type: Digital DC Output
- Output Technology: Transistor (Sourcing/Sinking — verify revision)
- Number of Output Points: 16
- Output Voltage Range: 24V DC (nominal)
- Backplane Compatibility: 1771 I/O chassis (A1B / A2B / A3B / A4B)
- Form Factor: Single-slot 1771 I/O module
- Weight: Approx. 620 g
Note: Always cross-reference the module revision letter and firmware with your system documentation before installation. Konmask.com does not fabricate or alter specifications.
Key Features & Benefits
- Drop-in Replacement: Direct fit for existing 1771 I/O chassis — no rack modification or PLC-5 reprogramming required.
- 16-Point DC Output: High-density output capacity ideal for compact panel designs and high I/O count applications.
- Transistor Output Technology: Fast switching response suitable for high-cycle actuators, solenoids, and indicator circuits.
- Industrial-Grade Reliability: Designed to Allen-Bradley’s rigorous standards for harsh manufacturing environments.
- Large Global Ecosystem: Supported by an extensive network of integrators, spare-parts suppliers, and documentation resources worldwide.
- Minimal Downtime Risk: Identical OEM specification — restore production without re-engineering your control system.
Industry & Equipment Applications
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, assembly robot cells
- Oil & Gas: Wellhead control panels, pipeline valve actuation, compressor skids
- Food & Beverage: Filling lines, pasteurization systems, packaging machinery
- Pulp & Paper: Winder drives, roll handling, process control panels
- Water & Wastewater: Pump station control, valve sequencing, SCADA-linked I/O
- Mining & Metals: Conveyor drives, crusher controls, smelter automation
System Integration & Compatible Parts
The 1771-OB operates within the Allen-Bradley 1771 I/O platform. Commonly paired and compatible components include:
- 1771-A1B / A2B / A3B / A4B — 1771 I/O chassis (4, 8, 12, 16 slot)
- 1771-P4S / P6S / P7 — 1771 I/O chassis power supplies
- 1771-IB / IC / ID — Complementary digital DC input modules
- 1785-Lxx — PLC-5 processors (L11, L20, L40, L60, L80, etc.)
- 1771-WB — Wiring arm / field wiring assembly for 1771-OB
Contact our technical team if you need help identifying compatible chassis, power supplies, or wiring arms for your specific installation.
Our Quality Assurance Process
- Visual Inspection: Every module is inspected for physical damage, connector integrity, and label authenticity before listing.
- Functional Verification: Where applicable, modules are bench-tested or verified against known-good reference units.
- Authentic Sourcing: Sourced from verified industrial distributors, OEM surplus channels, and certified MRO partners — not grey-market or counterfeit supply chains.
- Secure Packaging: ESD-safe packaging with foam inserts and moisture barrier bags for international shipment.
- Documentation: Original datasheets and revision notes available upon request.
How to Order
- Submit an inquiry via the Contact / Quote Request form on this page.
- Provide your required quantity, delivery timeline, and any revision or firmware requirements.
- Our team will respond within 1 business day with availability, lead time, and a formal quotation.
- Upon order confirmation, we arrange secure packaging and international logistics to your facility.
For urgent requirements, email support@konmask.com or call +0086 19859288691.
Why Choose Konmask.com?
- ✅ Specialized in industrial automation components — PLC, DCS, servo, HMI, and drives
- ✅ Global shipping to 50+ countries with full export documentation support
- ✅ Dedicated B2B inquiry handling — no retail minimums, volume pricing available
- ✅ Technical pre-sales support from engineers with hands-on automation experience
- ✅ Transparent sourcing — we tell you exactly where the part comes from
- ✅ Responsive after-sales support and return policy for verified defects
Frequently Asked Questions
Q: Is the Allen-Bradley 1771-OB still in production?
A: The 1771 I/O platform has been discontinued by Rockwell Automation. However, a significant aftermarket supply exists through MRO distributors and surplus channels. Konmask.com sources verified units to support legacy PLC-5 installations globally.
Q: What is the difference between the 1771-OB and 1771-OBD?
A: The 1771-OBD is a later revision with enhanced diagnostics and slightly different electrical ratings. Always verify the exact part number and revision required by your system documentation before ordering.
Q: Can I use the 1771-OB in a ControlLogix or CompactLogix system?
A: No. The 1771-OB is designed exclusively for the 1771 I/O chassis used with PLC-5 processors. ControlLogix uses the 1756 I/O platform; CompactLogix uses 1769 I/O. These platforms are not cross-compatible.
Q: Do you provide a warranty on the 1771-OB?
A: Yes. We offer a limited warranty on all modules sold. Terms vary by product condition (new, refurbished, tested surplus). Please request warranty details with your quotation.
Q: How long does international shipping take?
A: Typical transit times are 5–10 business days for express international shipments. We work with DHL, FedEx, and UPS for reliable global delivery. Expedited options are available upon request.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
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