Allen-Bradley 1771-OAD – AC Digital Output Module | PLC-5 I/O Platform
Engineering Background
The Allen-Bradley 1771-OAD is a 16-point AC digital output module designed for the PLC-5 programmable controller family, one of Rockwell Automation’s most widely deployed industrial control platforms. Engineered for high-density discrete output control in demanding manufacturing environments, the 1771-OAD delivers reliable 120VAC switching across 16 isolated output channels, making it a cornerstone component in legacy and hybrid automation architectures still operating across process, discrete, and batch industries worldwide.
Product Positioning
Konmask.com supplies the 1771-OAD to maintenance engineers, MRO procurement teams, and system integrators who require verified, shelf-ready replacement modules for PLC-5 I/O racks. Our inventory is sourced through traceable industrial channels, inspected prior to dispatch, and supported by responsive technical pre-sales consultation — ensuring your line stays running with minimal downtime exposure.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1771-OAD |
| Module Type | AC Digital Output |
| Output Points | 16 (isolated) |
| Output Voltage Range | 85–132 VAC, 47–63 Hz |
| Output Current (per point) | 1.0 A continuous |
| Output Current (per module) | 8.0 A maximum |
| Output Device | Triac (solid-state) |
| Leakage Current (OFF state) | ≤ 10 mA |
| Voltage Drop (ON state) | ≤ 1.5 VAC |
| Backplane Current Draw (5VDC) | 800 mA |
| Isolation | 1500 VAC (field side to backplane) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% non-condensing |
| Keying | User-configurable module keying |
| Wiring Style | Screw terminal (via 1771-WN wiring arm) |
| Compatible Rack | 1771 I/O Chassis (all sizes) |
| Compatible Controller | PLC-5 family (5/10, 5/12, 5/15, 5/20, 5/25, 5/30, 5/40, 5/60, 5/80) |
| Certifications | UL Listed, CSA Certified, CE Marked |
| Weight | Approx. 600 g |
Proven Application Environments
- Automotive Manufacturing: Solenoid valve control, conveyor motor starters, and fixture clamping actuators in body-in-white and powertrain lines.
- Food & Beverage Processing: Pump and agitator control in CIP (clean-in-place) systems where 120VAC field devices are standard.
- Water & Wastewater Treatment: Valve actuation and pump sequencing in SCADA-integrated PLC-5 control panels.
- Oil & Gas Upstream/Midstream: Remote I/O rack expansion for wellhead and pipeline control stations.
- Pharmaceutical Batch Processing: Discrete output control in validated PLC-5 systems where module replacement requires traceable sourcing documentation.
- Material Handling & Packaging: Sortation gate control, reject actuators, and conveyor zone management.
Engineering Advantages
- Solid-State Triac Output: No mechanical contacts — eliminates contact bounce, arc erosion, and wear-related failure modes common in relay output modules.
- High Isolation Voltage: 1500 VAC field-to-backplane isolation protects the PLC-5 processor and backplane from field-side transients and ground faults.
- 16-Point Density: Maximizes I/O rack utilization, reducing the number of slots required versus lower-density alternatives.
- User-Configurable Keying: Prevents accidental installation of incorrect module types in multi-module racks — critical for validated and safety-adjacent applications.
- Direct PLC-5 Compatibility: Native 1771 backplane protocol — no adapter, bridge, or gateway required for integration into existing PLC-5 architectures.
- Proven Field Longevity: Modules from this series have demonstrated 15–25+ year service lives in climate-controlled industrial environments.
System Architecture & Signal Flow
The 1771-OAD occupies a single slot in any 1771 I/O chassis. The PLC-5 processor communicates with the module via the 1771 parallel backplane, writing output image table data at each scan cycle. The module’s internal logic latches the output state and drives the corresponding triac gate, switching the 120VAC field circuit. Each output channel is individually fused at the field wiring level (external fusing recommended per Rockwell publication 1771-6.5.12). The wiring arm (1771-WN or equivalent) connects field wiring to the module’s screw terminals without disturbing the module’s backplane seating.
Recommended companion components: 1771-WN Wiring Arm · 1771-A1B/A2B/A3B/A4B I/O Chassis · 1771-P4S/P7 Power Supply · 1785-Lxx PLC-5 Processor
Sourcing & Quality Verification
- Traceability: All 1771-OAD units are sourced through documented industrial supply channels. Catalog number, revision, and date code are verified against the physical module label prior to listing.
- Inspection Protocol: Modules undergo visual inspection for connector pin integrity, label legibility, housing condition, and absence of field modification or repair indicators.
- Functional Testing: Available upon request for high-quantity orders — contact our technical team to arrange pre-shipment bench verification.
- Packaging: Anti-static bag + foam-lined carton. Conforms to IEC 61340-5-1 ESD packaging requirements.
- Documentation: Rockwell Automation publication 1771-6.5.12 (module installation data) available upon request.
Procurement Process
- Confirm Compatibility: Verify your PLC-5 processor series and 1771 chassis revision. Contact us if you need assistance cross-referencing your existing rack configuration.
- Request a Quote: For orders of 2+ units or urgent MRO requirements, email support@konmask.com for volume pricing and lead time confirmation.
- Place Order: Add to cart and proceed through checkout. HKD pricing displayed; multi-currency checkout available.
- Shipping: Standard dispatch within 1–3 business days. Express DHL/FedEx options available for critical downtime situations — specify at checkout or contact us directly.
- Post-Delivery Support: Our technical team is available for installation guidance, rack configuration questions, and compatibility verification after receipt.
Technical FAQ
Q: Is the 1771-OAD compatible with the PLC-5/250 processor?
A: The PLC-5/250 uses the 1771 I/O platform and is compatible with the 1771-OAD. Verify chassis slot addressing and I/O image table mapping in your processor configuration.
Q: Can the 1771-OAD be used in a Remote I/O (RIO) rack?
A: Yes. The 1771-OAD is compatible with 1771 I/O chassis used as remote racks via 1771-ASB Remote I/O Adapter, provided the rack is within the RIO network’s addressing capacity.
Q: What is the maximum inrush current the triac outputs can handle?
A: The 1771-OAD triacs are rated for resistive and inductive loads up to 1.0 A continuous. For loads with high inrush (e.g., lamp loads, motor starters), consult Rockwell publication 1771-6.5.12 for derating guidelines.
Q: Do you supply the 1771-WN wiring arm separately?
A: Yes. Contact support@konmask.com to request availability and pricing for the 1771-WN and other 1771 I/O accessories.
Q: Is a certificate of conformance (CoC) available?
A: Available upon request for orders requiring traceability documentation. Specify at time of order.
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