Mitsubishi A0J2-E28AR Output Composite Unit | Replacement, Equivalent & Selection Guide
The Mitsubishi A0J2-E28AR is a relay output composite unit designed for the A0J2 series programmable logic controller (PLC) platform. It integrates both input and output functions in a single compact module, making it ideal for space-constrained control panels and small-to-medium automation systems. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams make informed decisions.
Technical Specifications
- Model: A0J2-E28AR
- Manufacturer: Mitsubishi Electric
- Series: A0J2 (MELSEC-A Series)
- Module Type: Output Composite Unit (I/O Combined)
- Output Type: Relay (R)
- I/O Points: 28 points (composite input/output)
- Rated Voltage: AC/DC (refer to system configuration)
- Output Rated Current: 2A per point (relay contact)
- Max Switching Voltage: 250V AC / 30V DC
- Operating Temperature: 0°C to 55°C
- Storage Temperature: -25°C to 75°C
- Weight: Approx. 740 g
- Communication Interface: A0J2 backplane bus
- Compliance: CE, UL (verify with current datasheet)
Compatible Replacement & Equivalent Models
When the A0J2-E28AR is discontinued or unavailable, the following models may serve as functional replacements or equivalents. Always verify electrical and mechanical compatibility before substitution.
- Mitsubishi A0J2-E28DR – Transistor sink output variant; same form factor, different output type
- Mitsubishi A0J2-E28DT – Transistor source output; suitable for NPN/PNP load switching
- Mitsubishi A1SY10 – Relay output module for MELSEC-A1S series; requires adapter or rewiring
- Mitsubishi QY10 – Q-series relay output module; requires Q-series CPU and base unit migration
- Mitsubishi FX3U-32MT/ES – FX3U series compact PLC with built-in I/O; suitable for system redesign
- Third-party equivalents: Consult Konmask technical team for verified cross-reference options
Note: Cross-series replacements may require software migration, wiring changes, or base unit upgrades. Contact our engineers for a compatibility assessment.
Why Choose the Original A0J2-E28AR
- Proven reliability in legacy A0J2 PLC installations with decades of field deployment
- Direct plug-in compatibility with A0J2 base units — no wiring or software changes required
- Relay output durability suitable for inductive loads, motors, solenoids, and contactors
- Compact composite design reduces panel space and simplifies wiring compared to separate I/O modules
- Genuine Mitsubishi Electric quality with full OEM traceability and warranty support
Typical Applications
- Factory automation and production line control
- Conveyor and material handling systems
- HVAC and building management control panels
- Packaging machinery and filling lines
- Water treatment and pump station control
- Legacy system maintenance and spare parts replenishment
System Compatibility
The A0J2-E28AR is designed exclusively for the Mitsubishi MELSEC A0J2 series PLC platform. It is not directly compatible with A1S, A2, Q, or iQ-R series base units without hardware adaptation.
- Compatible CPU: A0J2CPU, A0J2HCPU
- Compatible Base Units: A0J2-B5, A0J2-B8
- Programming Software: GX Developer (SW8D5C-GPPW) or GX Works2 (legacy mode)
- Bus Interface: A0J2 proprietary backplane bus
Selection Guide
Use the following criteria to determine whether the A0J2-E28AR is the right module for your application:
- Output load type: Choose relay (AR) for AC/DC mixed loads, inductive loads, or high-voltage switching. Choose transistor (DR/DT) for high-speed switching or DC-only loads.
- I/O point count: The E28 designation indicates 28 composite I/O points. Verify your I/O budget against your control program.
- System generation: If upgrading from A0J2 to Q or iQ-R series, a full system migration is recommended rather than module substitution.
- Spare parts strategy: For long-term maintenance of existing A0J2 systems, stocking 1–2 spare A0J2-E28AR units is advisable given end-of-life supply constraints.
- Budget vs. performance: If cost is a priority and the application allows, a refurbished or equivalent third-party module may be evaluated with engineering sign-off.
Quality Assurance & Sourcing
At Konmask.com, all Mitsubishi PLC modules are sourced through verified supply channels. Each unit undergoes:
- Visual and physical inspection upon receipt
- Functional verification testing where applicable
- Secure anti-static packaging for safe transit
- Full traceability documentation available on request
We supply both new original and refurbished tested units. Please specify your requirement when ordering.
How to Order
- Confirm your A0J2 base unit model and available slot count
- Verify the required output type (relay AR vs. transistor DR/DT)
- Add the A0J2-E28AR to your cart or contact us for bulk pricing
- Provide your delivery timeline — we offer standard and expedited shipping
- Request a proforma invoice or technical datasheet if needed
📧 Email: [email protected]
📞 Phone/WhatsApp: +0086 19859288691
🌐 Website: https://Konmask.com
Replacement & Compatibility FAQ
Q: Can I replace the A0J2-E28AR with a Q-series module?
A: Not directly. Q-series modules use a different backplane and bus architecture. A full system migration to Q-series hardware and software would be required.
Q: Is the A0J2-E28AR still in production?
A: The A0J2 series has reached end-of-life status. Availability depends on remaining stock from authorized distributors and secondary market sources. Contact Konmask for current stock status.
Q: What is the difference between A0J2-E28AR and A0J2-E28DR?
A: The AR suffix denotes relay output; the DR suffix denotes transistor (sink) output. Relay outputs support higher voltage and mixed AC/DC loads; transistor outputs offer faster switching for DC loads.
Q: Can Konmask source refurbished A0J2-E28AR units?
A: Yes. We offer refurbished tested units with inspection reports. Please contact our team for availability and pricing.
Q: Do you provide a warranty?
A: Yes. New original units carry the manufacturer warranty. Refurbished units carry a Konmask 90-day functional warranty. Terms available on request.
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