Allen-Bradley 1769-OA8 8-Point AC Solid State Output Module – CompactLogix 1769 Series
When a CompactLogix system loses its output module, the consequences are immediate and measurable. Conveyor lines stop mid-cycle, motor starters fail to energize, and solenoid valves freeze in position — halting production and triggering costly unplanned downtime that, in high-throughput manufacturing environments, can exceed $10,000 per hour. The 1769-OA8 is the output interface between the controller’s logic and the physical world; without it, the PLC has no voice on the plant floor.
The Allen-Bradley 1769-OA8 resolves this directly. As an 8-point, 120/240VAC solid-state (triac) output module in the CompactLogix 1769 series, it delivers zero-crossing switching, electrical isolation between field and backplane, and a compact form factor that slots directly into any 1769 bus without additional hardware. Engineers specify it because it eliminates the mechanical wear and contact bounce inherent in relay-based alternatives, extending mean time between failures in high-cycle applications by an order of magnitude.
Technical Specifications
Electrical
- Output Type: Solid-state (triac), AC
- Number of Outputs: 8 points
- Output Voltage Range: 74–265V AC (47–63 Hz)
- Output Current: 0.5A per point continuous; 1A per point for ≤1 second
- Surge Current: 6A for 16.7ms (one half-cycle)
- Leakage Current: ≤10mA at 265V AC
- Minimum Load Current: 10mA
- Output Grouping: 2 groups of 4 (commons isolated between groups)
- Backplane Current Draw: 100mA at 5V DC
- Power Dissipation: 2.5W maximum
Mechanical
- Module Width: 1 slot (CompactLogix 1769 bus)
- Wiring: Removable terminal block (RTB), cage clamp
- Wire Size: 14–22 AWG solid or stranded
- Weight: Approx. 300g
Environmental
- Operating Temperature: 0–60°C (32–140°F)
- Storage Temperature: -40–85°C (-40–185°F)
- Relative Humidity: 5–95% non-condensing
- Vibration: 2g @ 10–500Hz (IEC 68-2-6)
- Shock: 30g operational (IEC 68-2-27)
Certifications
- UL Listed (UL 508)
- CE Marked (EN 61131-2)
- CSA Certified
- RoHS Compliant
Complies with IEC 61131-2 programmable controller I/O module standard.
Key Features & Benefits
- Zero-crossing switching — Triacs fire at the AC zero-crossing point, eliminating inrush transients that degrade inductive loads and reducing EMI emissions by up to 40% compared to random-fire switching.
- Dual-group isolated commons — Two independent 4-point groups allow simultaneous control of 120VAC and 240VAC field devices from a single module, reducing panel footprint and wiring cost.
- 0.5A continuous per point — Sufficient for the majority of solenoid valves, pilot lights, and small motor starters without external amplification, covering >80% of typical discrete output applications.
- Removable terminal block (RTB) — Field wiring stays connected to the RTB during module replacement, reducing maintenance time from hours to minutes and eliminating rewiring errors.
- Solid-state reliability — No moving contacts means no mechanical wear; MTBF exceeds relay-based equivalents by 10× in high-cycle applications (>1 million operations/year).
- IEC 61131-2 compliant — Meets international PLC I/O standards, satisfying CE marking requirements for machinery exported to EU markets under the Machinery Directive 2006/42/EC.
Industry & Equipment Applications
Automotive Manufacturing
- Body welding lines: controls weld gun solenoids and clamp cylinders in high-cycle (≥500 cycles/hour) environments where relay contacts would fail within weeks
- Paint shop conveyors: switches 120VAC conveyor drive contactors with zero-crossing to protect VFD input circuits
- Assembly torque stations: energizes indicator lights and part-present solenoids in mixed 120/240VAC panels
Food & Beverage Processing
- Filling and capping machines: drives pneumatic valve solenoids (120VAC) in washdown environments where solid-state construction resists moisture ingress better than relay sockets
- Pasteurization systems: controls heating element contactors with precise on/off timing required by HACCP process validation
- Packaging lines: switches reject gate solenoids at rates exceeding 200 cycles/minute
Water & Wastewater Treatment
- Pump station control panels: energizes motor starter coils (120VAC control voltage) for submersible pumps in remote, unattended installations
- Chemical dosing systems: controls metering pump solenoids with the leakage current spec (≤10mA) critical for avoiding false actuation of sensitive dosing valves
- UV disinfection systems: switches UV lamp ballasts requiring the surge current rating (6A/16.7ms) to handle lamp ignition inrush
Oil & Gas
- Wellhead control panels: drives ESD (emergency shutdown) valve solenoids in Class I Div 2 enclosures (module mounted in purged panel)
- Pipeline compressor stations: controls lube oil pump motor starters and auxiliary equipment in 120VAC control circuits
- Separator skids: switches level control valve solenoids in continuous-duty service requiring solid-state longevity
Pharmaceutical Manufacturing
- Cleanroom HVAC: controls damper actuator solenoids in 21 CFR Part 11 validated systems where module change history must be documented
- Bioreactor systems: switches agitator motor starters and sparger valve solenoids in GMP environments
- Lyophilizer (freeze dryer) control: drives vacuum valve solenoids requiring reliable switching across the full 74–265VAC range
Material Handling & Logistics
- Sortation conveyors: controls divert gate solenoids at high cycle rates in distribution centers operating 24/7
- Automated storage and retrieval (AS/RS): switches aisle car motor contactors and brake solenoids in multi-level rack systems
- Palletizing robots: drives gripper solenoids and safety gate interlocks in collaborative robot cells
System Integration & Compatible Parts
Compatible Controllers (upstream)
- 1769-L23E-QB1B, 1769-L23E-QBFC1B — CompactLogix L23 controllers with embedded I/O expansion
- 1769-L24ER-QB1B, 1769-L27ERM-QBFC1B — CompactLogix L2x series
- 1769-L30ER, 1769-L33ER, 1769-L36ERM — CompactLogix L3x series
- Any controller using the 1769 bus (left-side or right-side expansion)
Companion I/O Modules (same bus)
- 1769-IQ16 — 16-point 24VDC sink/source input module (typical pairing for discrete control loops)
- 1769-IA8I — 8-point 120VAC isolated input module (matched input for 120VAC field devices)
- 1769-OF4 — 4-channel analog output module (for mixed discrete/analog panels)
- 1769-ECR / 1769-ECL — Right/left end caps (required to terminate the 1769 bus)
Power Supply
- 1769-PA2 — 120/240VAC input, 2A at 5V DC backplane power supply
- 1769-PB2 — 24VDC input, 2A at 5V DC backplane power supply
Alternative / Equivalent Models
- 1769-OA16 — 16-point version; specify when point count exceeds 8 or panel density is a priority. Direct drop-in replacement in terms of bus compatibility.
- 1769-OB8 — 8-point 24VDC sourcing output; specify instead of OA8 when field devices operate on 24VDC rather than 120/240VAC. Not interchangeable without field wiring changes.
- 1769-OW8I — 8-point relay output with isolated contacts; specify when load types are mixed (AC/DC) or when galvanic isolation per point is required. Relay version has lower cycle life.
Our Quality Assurance Process
Every 1769-OA8 unit sourced through Konmask.com passes a documented 4-step inspection before shipment:
- Source Verification — Units are sourced from authorized distributors, OEM surplus channels, or verified secondary market suppliers with traceable purchase records. Counterfeit screening begins at the procurement stage.
- Physical Inspection — Label authenticity, catalog number, series letter, firmware revision markings, and connector condition are verified against Rockwell Automation reference standards. Housing integrity and RTB locking mechanism are checked.
- Functional Test — Where test equipment is available, modules are bench-tested on a live 1769 bus: backplane communication verified, output points individually actuated and confirmed with a calibrated load, and LED status indicators validated.
- Packaging & Documentation — Units are packed in anti-static bags with foam protection. Inspection records are retained and available upon request.
Available Documentation (on request):
- Inspection report / test record
- Certificate of conformance
- Supplier traceability documentation
- Rockwell Automation original datasheet (1769-OA8 User Manual, publication 1769-UM011)
How to Order
- Submit your inquiry — Email support@konmask.com or use the contact form with your required quantity, delivery timeline, and destination country. Include your project context if lead time is critical.
- Receive a quote within 24 hours — Our team confirms stock availability, unit condition (new/surplus/refurbished), and provides a firm price with shipping options. We respond to all inquiries within one business day.
- Confirm and ship — Upon order confirmation, units are inspected, packed, and dispatched. Global shipping is available; we handle export documentation for international orders. Tracking is provided upon dispatch.
Contact: support@konmask.com | +0086 19859288691
Why Choose Konmask.com?
- Specialist focus — We stock Allen-Bradley CompactLogix and ControlLogix components as a core category, not as an afterthought. Our team understands the 1769 ecosystem at a system level.
- Documented sourcing — Every unit comes with traceable sourcing records. We do not sell modules of unknown origin.
- Global fulfillment — We ship to manufacturing facilities across Asia, Europe, the Middle East, and the Americas. Export documentation and customs support are included.
- Technical pre-sales support — Not sure if the OA8 is the right module for your application? Our engineers will review your panel design and confirm compatibility before you order.
- Responsive communication — 24-hour inquiry response, with direct engineer-to-engineer communication for complex requirements. No call centers, no ticket queues.
Frequently Asked Questions
Q: Can the 1769-OA8 control 240VAC motor starters in a compressor station application?
A: Yes. The 1769-OA8 is rated for 74–265V AC, covering both 120VAC and 240VAC control circuits. For compressor station motor starters, verify that the starter coil inrush current does not exceed the 6A surge rating (16.7ms). For large starters with high inrush, an interposing relay or solid-state relay with higher surge rating may be required between the module output and the starter coil.
Q: What is the minimum load current requirement, and does it affect solenoid valve applications?
A: The 1769-OA8 requires a minimum load current of 10mA per output point. Most industrial solenoid valves (120VAC, 5–20VA coil rating) draw well above this threshold and are fully compatible. For very low-power pilot lights or indicator lamps (<10mA), a bleeder resistor wired in parallel with the load is required to maintain minimum current and prevent false triggering from triac leakage.
Q: Is the 1769-OA8 suitable for use in a pharmaceutical cleanroom HVAC control panel under 21 CFR Part 11?
A: The module itself is hardware; 21 CFR Part 11 compliance is a system-level requirement governed by the software and validation procedures, not the I/O module. The 1769-OA8 is compatible with CompactLogix controllers running FactoryTalk software, which supports audit trail and electronic records functionality. Your validation team will need to document the module’s catalog number, series, and firmware revision as part of the hardware configuration record (HCR). We can provide a certificate of conformance and inspection report to support your IQ/OQ documentation.
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Contact: support@konmask.com | +0086 19859288691
