Allen-Bradley 1771-OBN/B – 16-Point 120V AC Digital Output Module | PLC-5 1771 I/O Platform
Engineering Background: The Allen-Bradley 1771-OBN/B is a discrete output module designed for the Rockwell Automation PLC-5 programmable controller family, operating within the 1771 I/O chassis infrastructure. It provides 16 individually isolated output points rated at 120V AC, making it a proven solution for driving solenoids, motor starters, indicator lamps, and other field devices in industrial control systems.
Product Positioning: Targeted at maintenance engineers, system integrators, and procurement specialists managing legacy PLC-5 installations, the 1771-OBN/B delivers reliable discrete output control in process, manufacturing, and utilities environments where the 1771 backplane architecture remains the standard. Konmask.com maintains verified stock of this module to support MRO and capital project requirements globally.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1771-OBN/B |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Module Type | Digital (Discrete) Output |
| Platform | PLC-5 / 1771 I/O |
| Number of Output Points | 16 |
| Output Voltage | 120V AC |
| Output Current per Point | 1.0A maximum |
| Total Module Current | 4.0A maximum |
| Output Type | Triac (solid-state) |
| Isolation | Optical isolation, field side to backplane |
| Backplane Current Draw | 800mA @ 5V DC |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Weight | Approx. 380g |
| Wiring | 1771-WN wiring arm (field-side) |
| Agency Certifications | UL Listed, CSA Certified, CE Marked |
Proven Application Environments
- Discrete Manufacturing: Conveyor control, machine tool sequencing, assembly line actuator control
- Process Industries: Valve actuation, pump motor starter control, alarm annunciator panels
- Utilities & Infrastructure: Water treatment plant I/O, power distribution switching logic
- Oil & Gas: Wellhead control panels, compressor station automation
- Food & Beverage: Packaging line control, filling station sequencing
- MRO Replacement: Direct drop-in replacement for existing 1771-OBN/A installations
Engineering Advantages
- Optical Isolation: Full galvanic separation between field wiring and backplane logic protects the PLC-5 processor from field-side transients and ground loops
- Solid-State Triac Output: No mechanical contacts — eliminates contact wear, reduces maintenance intervals, and supports high-cycle applications
- 16-Point Density: Maximizes chassis slot utilization in space-constrained control panels
- Backward Compatibility: /B revision maintains full backward compatibility with /A revision wiring arms and chassis configurations
- LED Status Indicators: Per-point output status LEDs enable rapid field diagnostics without test equipment
- Proven Field Record: Decades of deployment across global industrial installations with documented MTBF performance
System Architecture & Signal Flow
The 1771-OBN/B occupies a single slot in any 1771 I/O chassis (1771-A1B through 1771-A4B series). The PLC-5 processor communicates output states via the 1771 backplane at the chassis scan rate. Each output point drives a triac output circuit through an optical coupler, switching 120V AC field power to the connected load. The wiring arm (1771-WN) provides the field-side terminal block interface, allowing module replacement without disturbing field wiring.
Signal Path: PLC-5 Processor → 1771 Backplane → Output Image Table → Optical Coupler → Triac → Field Device (120V AC Load)
Sourcing & Quality Verification
- All units sourced through verified industrial distribution channels and authenticated against Rockwell Automation product markings
- Physical inspection performed: catalog label, revision marking (/B), connector integrity, and LED functionality
- Serialization and date codes documented on request for traceability
- Functional test available upon request prior to shipment for critical MRO applications
- Packaging: anti-static bag, foam-lined carton, with inspection report included
Procurement Process
- Confirm Requirement: Verify catalog number 1771-OBN/B and revision (/B) against your existing system BOM or spare parts list
- Request Quote: Contact support@konmask.com with quantity, required delivery date, and destination country
- Order Confirmation: Purchase order accepted via email; proforma invoice issued within 1 business day
- Shipment: DHL / FedEx / UPS international express; tracking provided within 24 hours of dispatch
- Documentation: Commercial invoice, packing list, and certificate of conformance included with every shipment
Technical FAQ
Q: Is the 1771-OBN/B compatible with all PLC-5 processors?
A: Yes. The module is compatible with all PLC-5 processor families (PLC-5/10, 5/12, 5/15, 5/20, 5/25, 5/30, 5/40, 5/60, 5/80) when installed in a 1771 I/O chassis.
Q: Can the 1771-OBN/B replace a 1771-OBN/A?
A: Yes. The /B revision is a direct replacement for the /A revision with no wiring or configuration changes required.
Q: What wiring arm is required?
A: The 1771-WN wiring arm is the standard field-side terminal interface for this module.
Q: Is the module available new or refurbished?
A: Konmask.com supplies both new-surplus and professionally refurbished units. Condition is specified at time of quotation.
Q: What is the lead time?
A: In-stock units ship within 1–3 business days. Contact us for current availability.
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