Discrete AC Output Solution — Allen-Bradley 1746-OA8 | SLC 500 Series
The Allen-Bradley 1746-OA8 is an 8-point 120/240V AC triac output module designed for the SLC 500 modular chassis. It delivers reliable, isolated AC switching for demanding industrial environments where precise load control and system uptime are non-negotiable.
Where This Product Is Used
Engineers and system integrators deploy the 1746-OA8 across a wide range of industrial applications, including:
- Conveyor & Material Handling Systems — Controlling AC solenoids, motor starters, and pilot lights along production lines.
- Packaging Machinery — Sequencing actuators, sealing elements, and reject gates in high-cycle environments.
- HVAC & Building Automation — Switching contactors, damper actuators, and fan starters in commercial and industrial facilities.
- Water & Wastewater Treatment — Operating pump starters, valve actuators, and alarm outputs in wet, corrosive environments.
- Food & Beverage Processing — Driving AC loads in washdown-rated panels where hygiene and reliability are critical.
- Automotive Assembly — Coordinating fixture clamps, weld timers, and transfer mechanisms on body-in-white lines.
- Oil & Gas Utilities — Activating field devices in remote pump stations and compressor control panels.
Technical Specifications
- Module Type: Discrete AC Output
- Catalog Number: 1746-OA8
- Series: SLC 500 Modular
- Number of Outputs: 8 points
- Output Voltage Range: 85–265V AC, 47–63 Hz
- Maximum Load Current: 1.0A per point; 4.0A per module (continuous)
- Surge Current: 10A for 43ms (one cycle)
- Output Device: Triac (solid-state, no moving contacts)
- Isolation: Optical isolation between field side and backplane
- Backplane Current Draw: 125mA @ 5V DC
- 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
- Wiring: Removable terminal block (RTB), 22–14 AWG
- Indicators: Per-point output status LEDs
- Weight: Approx. 360g
- Compatible Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13
Why Engineers Specify This Model
- Solid-State Reliability: Triac outputs eliminate contact wear, reducing maintenance intervals in high-cycle applications.
- Wide Voltage Tolerance: 85–265V AC range accommodates global line voltage variations without module substitution.
- Optical Isolation: Protects the SLC 500 backplane from field-side transients and ground loops.
- Per-Point LED Diagnostics: Instant visual confirmation of output state accelerates fault-finding during commissioning and maintenance.
- Removable Terminal Block: Enables module swap without rewiring, minimizing downtime during replacement.
- Proven SLC 500 Ecosystem: Seamless integration with existing SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors.
Complete System Bill of Materials
A typical SLC 500 control panel using the 1746-OA8 may include:
- Processor: 1747-L532 (SLC 5/03) or 1747-L542 (SLC 5/04)
- Chassis: 1746-A7 (7-slot) or 1746-A10 (10-slot)
- Power Supply: 1746-P2 (5A) or 1746-P4 (10A)
- Input Module: 1746-IA16 (120V AC, 16-point) or 1746-IB16 (24V DC)
- Output Module: 1746-OA8 (this module) — AC loads
- Analog I/O (optional): 1746-NI4 or 1746-NO4I
- Programming Cable: 1747-UIC (USB-to-DH-485)
- Programming Software: RSLogix 500 / Studio 5000 Logix Designer
- Removable Terminal Block: 1746-RT25 (included or sold separately)
Compliance & Industry Standards
- UL Listed: UL 508 (Industrial Control Equipment)
- CE Marked: Compliant with EU Low Voltage and EMC Directives
- CSA Certified: CSA C22.2 No. 142
- RoHS Compliant: Restriction of Hazardous Substances (EU Directive 2011/65/EU)
- IEC 61131-2: Programmable Controllers — Equipment Requirements and Tests
- ATEX / Class I Div 2: Consult factory for hazardous location suitability
Quality Assurance & Sourcing
Konmask.com sources the 1746-OA8 through verified industrial distribution channels. Every unit undergoes incoming inspection including visual examination, label verification, and functional continuity checks before dispatch. We supply both new-in-box (NIB) and factory-refurbished units, clearly identified at point of sale. Traceability documentation is available upon request for MRO and OEM procurement teams.
How to Source This Part
- Add to Cart — Select quantity and proceed to checkout directly on this page.
- Request a Quote — For orders of 5+ units or project-based procurement, email support@konmask.com for volume pricing.
- Expedited Availability — Call or WhatsApp +0086 19859288691 for urgent lead-time confirmation.
- Cross-Reference Check — Need to verify compatibility with your existing chassis or processor revision? Contact us with your full BOM and we will confirm fit.
Application-Specific FAQ
Q: Can the 1746-OA8 drive 240V AC motor starters directly?
A: Yes. The module supports 85–265V AC loads up to 1.0A per point. For motor starters drawing more than 1A, use an interposing relay or contactor rated for the full motor load.
Q: Is the 1746-OA8 compatible with SLC 5/05 Ethernet processors?
A: Yes. All 1746-series I/O modules are compatible with any SLC 500 processor (5/01 through 5/05) in a standard 1746 chassis.
Q: What is the difference between 1746-OA8 and 1746-OA16?
A: The OA8 provides 8 output points; the OA16 provides 16 points. Both are 120/240V AC triac outputs. Choose OA8 for smaller I/O counts or when chassis slot density is a priority.
Q: Can I hot-swap the 1746-OA8 without powering down the chassis?
A: Rockwell Automation does not officially support hot-swap on standard SLC 500 I/O modules. Power down the chassis before removing or inserting modules to prevent backplane damage.
Q: Do you supply the removable terminal block (RTB) with the module?
A: New-in-box units include the RTB. Refurbished units may or may not include the RTB — confirm at time of order. Replacement RTBs (1746-RT25) are available separately.
Q: What firmware or software is required to configure this module?
A: No firmware configuration is required for the 1746-OA8. Output addressing is handled automatically by RSLogix 500 based on chassis slot position. No additional licensing is needed beyond your existing RSLogix 500 installation.
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