Allen-Bradley 1771-OA – AC Digital Output Module | POINT I/O Platform
Engineering Background: The Allen-Bradley 1771-OA is a discrete AC digital output module designed for the POINT I/O modular I/O system by Rockwell Automation. It provides reliable interface between the PLC control system and field-side AC-powered actuators, solenoids, motor starters, and control relays in industrial automation environments.
Product Positioning: Engineered for process control, machine automation, and panel-builder applications where compact, high-density AC output capability is required. The 1771-OA integrates seamlessly into Allen-Bradley PLC-5 and 1771 I/O chassis systems, making it a proven choice for both greenfield installations and legacy system maintenance.
Complete Technical Specifications
- Part Number: 1771-OA
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series / Platform: POINT I/O / 1771 I/O
- Module Type: Digital Output Module (Discrete AC Output)
- Output Voltage Range: 85–265 VAC
- Output Frequency: 47–63 Hz
- Output Current per Point: 1.0 A continuous
- Number of Output Points: 16 outputs
- Output Type: Triac (solid-state AC switch)
- Isolation: Optical isolation between field and backplane
- Backplane Current Draw: 800 mA @ 5 VDC
- Operating Temperature: 0°C to +60°C (32°F to 140°F)
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5–95% non-condensing
- Weight: 680 g (approx.)
- Certifications: UL Listed, CE Marked, CSA Certified
- Mounting: 1771 I/O chassis slot (half-slot or full-slot compatible)
Proven Application Environments
- Discrete manufacturing lines — motor starter and contactor control
- Process plants — solenoid valve actuation in fluid/gas systems
- Material handling — conveyor drive enable/disable sequencing
- HVAC and building automation — fan and pump control via AC outputs
- Water/wastewater treatment — pump station control panels
- Food & beverage — hygienic process line control with AC actuators
- Legacy PLC-5 system maintenance and spare-parts replenishment
Engineering Advantages
- Solid-State Triac Output: No mechanical wear, extended service life vs. relay output modules
- Wide AC Voltage Range: 85–265 VAC accommodates global power standards without re-engineering
- Optical Isolation: Protects PLC backplane from field-side voltage transients and noise
- High-Density 16-Point Design: Minimizes chassis slot consumption and panel footprint
- Drop-in Compatibility: Direct replacement for existing 1771 I/O chassis installations
- Proven Field Reliability: Decades of deployment in mission-critical industrial environments
System Architecture & Signal Flow
The 1771-OA receives discrete ON/OFF commands from the PLC-5 processor via the 1771 I/O chassis backplane. Each output point drives an internal triac gate through an optical isolator, switching the field-side AC load circuit. The module’s LED status indicators provide real-time per-point output state visibility for commissioning and fault diagnosis. Field wiring connects via the removable terminal block (RTB) on the module face, enabling wiring pre-termination before module insertion.
Sourcing & Quality Verification
- Source: Surplus new, refurbished-tested, or factory-reconditioned stock — condition specified at time of quotation
- Testing: Each unit undergoes functional power-on verification and output continuity testing prior to shipment
- Authenticity: All modules are verified against Allen-Bradley catalog markings, date codes, and label integrity
- Warranty: 12-month replacement warranty against defects in materials and workmanship
- Packaging: Anti-static bag + foam-lined carton for safe international transit
Procurement Process
- Submit your RFQ or place order directly on Konmask.com
- Receive order confirmation with lead time and shipping estimate within 24 hours
- Unit inspected, tested, and packaged to order specifications
- Shipped via DHL / FedEx / UPS with full tracking — worldwide delivery available
- Post-delivery technical support available via email or phone
Technical FAQ
Q: Is the 1771-OA compatible with PLC-5 processors?
A: Yes. The 1771-OA is designed for the 1771 I/O chassis used with Allen-Bradley PLC-5 family processors.
Q: Can this module switch DC loads?
A: No. The 1771-OA is an AC output module (triac-based). For DC loads, use the 1771-OD or 1771-OW series.
Q: What is the maximum load current per output point?
A: 1.0 A continuous per output point. Consult the Allen-Bradley 1771-OA installation manual for derating curves at elevated temperatures.
Q: Do you provide the Removable Terminal Block (RTB)?
A: RTB availability is confirmed at quotation. Please specify if required when placing your order.
Q: Can I order a single unit?
A: Yes. Konmask.com supports single-unit and bulk orders with no minimum order quantity.
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