Mitsubishi FX3U-32MR/DS – Compact PLC CPU Unit | FX3U Series
Engineering Background
The Mitsubishi FX3U-32MR/DS is a high-performance compact PLC CPU unit from Mitsubishi Electric’s flagship FX3U series — the most advanced generation of the FX family. Designed for demanding industrial automation environments, the FX3U platform delivers exceptional processing speed, expanded I/O capacity, and robust communication capabilities in a compact DIN-rail form factor. The “/DS” designation indicates a dual DC power supply configuration (24 VDC input power + 24 VDC I/O), making it ideal for installations requiring clean, stable power separation.
Product Positioning
The FX3U-32MR/DS targets automation engineers and system integrators who require a reliable, mid-range PLC CPU with relay output capability, dual DC power architecture, and seamless integration into Mitsubishi’s broader iQ and MELSEC ecosystems. It is a proven workhorse across manufacturing, packaging, material handling, and process control applications globally.
Complete Technical Specifications
- Model: FX3U-32MR/DS
- Series: MELSEC FX3U
- Manufacturer: Mitsubishi Electric
- CPU Type: Compact PLC CPU Unit
- I/O Points: 32 total (16 inputs + 16 outputs)
- Input Type: DC sink/source (24 VDC)
- Output Type: Relay (MR)
- Output Rated Load: 2A per point, 8A per common
- Power Supply: Dual DC – 24 VDC (DS designation)
- Power Consumption: ≤ 30W
- Program Memory: 64,000 steps (with memory cassette)
- Basic Instruction Speed: 0.065 μs/step
- Internal Relay (M): M0–M7679 (7,680 points)
- Data Register (D): D0–D7999 (8,000 points)
- Timer (T): T0–T511 (512 points)
- Counter (C): C0–C255 (256 points)
- High-Speed Counter: 6 channels, up to 100 kHz
- Built-in Communication: RS-422 (programming port)
- Expandable I/O: Up to 256 points (with expansion modules)
- Special Function Modules: Up to 8 units
- Operating Temperature: 0°C to 55°C
- Storage Temperature: -25°C to 75°C
- Humidity: 5% to 95% RH (non-condensing)
- Vibration Resistance: 10–57 Hz: 0.075 mm; 57–150 Hz: 9.8 m/s²
- Shock Resistance: 147 m/s² (3 times each direction)
- Enclosure Rating: IP20
- Mounting: DIN rail or direct screw mount
- Dimensions (W×H×D): 150 × 90 × 86 mm
- Weight: Approx. 650 g
- Certifications: CE, UL, cUL
- Programming Software: GX Works2 / GX Developer
Proven Application Environments
- Packaging Machinery: Conveyor sequencing, filling line control, label applicators
- Material Handling: Palletizers, sorters, automated storage and retrieval systems (ASRS)
- Machine Tools: CNC auxiliary control, tool changers, coolant management
- Food & Beverage: Batch processing, temperature sequencing, hygienic relay output compatibility
- Building Automation: HVAC control, access control panels, elevator auxiliary systems
- Water Treatment: Pump sequencing, level control, dosing systems
- Automotive Assembly: Fixture control, torque sequencing, end-of-line test stations
Engineering Advantages
- Dual DC Power Architecture (/DS): Separates logic power from I/O power, reducing noise coupling and improving system reliability in electrically noisy environments.
- Relay Output (MR): Supports AC and DC loads up to 240 VAC / 30 VDC, providing maximum output circuit flexibility without external relays.
- High-Speed Processing: 0.065 μs basic instruction cycle — among the fastest in the compact PLC class — enables precise motion and timing control.
- Scalable Architecture: Expand from 32 to 256 I/O points with standard FX3U expansion modules; add analog, temperature, positioning, and communication modules without changing the CPU.
- Built-in High-Speed Counters: 6 channels up to 100 kHz support encoder feedback and pulse counting without additional hardware.
- Broad Communication Options: Via optional BD boards and special adapters — RS-232C, RS-485, Ethernet, CC-Link, PROFIBUS, DeviceNet, and more.
- Battery-Backed Memory: Retains program and data during power loss; optional EEPROM cassette for non-volatile storage.
- GX Works2 Compatibility: Full support for Ladder, SFC, and Structured Text programming with simulation and diagnostics.
System Architecture & Signal Flow
The FX3U-32MR/DS operates on a cyclic scan architecture. The CPU reads all 16 DC input states into the input image register at the start of each scan cycle. The user program (up to 64,000 steps) is then executed sequentially, updating the output image register. At the end of the scan, all 16 relay output states are written simultaneously to the physical output terminals. High-speed counter interrupts and pulse catch inputs bypass the scan cycle for time-critical events. Expansion modules connect via the right-side bus connector, extending the I/O image transparently. Communication adapters attach to the left-side BD board slot, enabling network integration without consuming I/O points.
Sourcing & Quality Verification
- Origin: Genuine Mitsubishi Electric product, sourced through authorized distribution channels.
- Inspection: Each unit undergoes incoming inspection including label verification, firmware version check, and functional power-on test before shipment.
- Packaging: Ships in original Mitsubishi anti-static packaging with all factory accessories (terminal block cover, manual, mounting hardware).
- Traceability: Serial number and date code recorded at time of dispatch; available upon request for warranty and audit purposes.
- Warranty: 12-month Konmask quality guarantee covering manufacturing defects; Mitsubishi Electric standard warranty terms apply.
Procurement Process
- Step 1 – Inquiry: Submit your BOM or part number via the product page or email support@konmask.com with quantity and required delivery date.
- Step 2 – Quotation: Receive a formal quotation within 1 business day including unit price, lead time, and shipping options (DHL / FedEx / sea freight).
- Step 3 – Order Confirmation: Confirm the order via purchase order or online checkout. Payment terms: T/T, PayPal, or credit card.
- Step 4 – Inspection & Dispatch: Unit inspected, packed, and dispatched within 1–3 business days of payment confirmation.
- Step 5 – Tracking & Support: Tracking number provided upon shipment. Post-delivery technical support available via email or WhatsApp.
Technical FAQ
Q: What is the difference between FX3U-32MR/DS and FX3U-32MR/ES?
A: The /DS variant uses a 24 VDC dual power supply (logic + I/O both DC). The /ES variant uses a 100–240 VAC power supply. Choose /DS for all-DC panel designs; choose /ES for AC-powered control cabinets.
Q: Can the FX3U-32MR/DS communicate with Mitsubishi HMIs (GOT series)?
A: Yes. Connect via RS-422 (built-in port) or add an RS-232C/RS-485 BD board for GOT1000/GOT2000 series HMIs using Mitsubishi protocol or MODBUS RTU.
Q: Is Ethernet communication supported?
A: Not natively. Add the FX3U-ENET-ADP Ethernet adapter to enable TCP/IP communication, SLMP protocol, and remote monitoring via GX Works2.
Q: What programming software is required?
A: GX Works2 (recommended) or GX Developer. GX Works2 supports Ladder Diagram (LD), Sequential Function Chart (SFC), and Structured Text (ST) with built-in simulation.
Q: Can I expand the I/O beyond 32 points?
A: Yes. Connect FX3U/FX2N series expansion modules to the right-side bus to reach up to 256 total I/O points. Up to 8 special function modules are also supported.
Q: What is the maximum program size?
A: 64,000 steps with an optional FX3U-FLROM-64L memory cassette. Without a cassette, the built-in RAM supports up to 64,000 steps with battery backup.
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