Precision Analog Signal Acquisition Solution — Mitsubishi FX3U-4AD | FX3U Series
The Mitsubishi FX3U-4AD is a dedicated 4-channel analog input expansion module engineered for the Mitsubishi MELSEC FX3U PLC series. Designed for industrial environments where accurate analog signal measurement is critical, this module enables seamless integration of real-world process variables — temperature, pressure, flow, and position — directly into your FX3U control system. Whether you are commissioning a new production line or upgrading an existing automation cell, the FX3U-4AD delivers the signal fidelity and system compatibility that process engineers demand.
Where This Product Is Used
The FX3U-4AD is specified across a broad range of industrial applications where analog signal acquisition is essential:
- Process Manufacturing: Monitoring pressure transmitters (4–20 mA) and temperature sensors (0–10 V) in chemical, pharmaceutical, and food processing plants.
- HVAC & Building Automation: Reading airflow, humidity, and temperature sensors in intelligent building management systems.
- Machine Tool & CNC: Capturing spindle load feedback and servo drive analog outputs for adaptive machining control.
- Water & Wastewater Treatment: Interfacing with level transmitters, pH sensors, and flow meters in pump station control panels.
- Packaging & Conveyor Systems: Monitoring tension, speed, and weight signals from load cells and encoders with analog outputs.
- Energy Monitoring: Acquiring current transformer (CT) outputs for real-time power consumption tracking in factory energy management systems.
- Plastics & Rubber Extrusion: Reading melt pressure and barrel temperature signals for closed-loop extrusion control.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FX3U-4AD |
| Manufacturer | Mitsubishi Electric |
| Series | MELSEC FX3U |
| Number of Channels | 4 (independent) |
| Input Signal Type | Voltage: DC 0–10 V / DC ±10 V; Current: DC 4–20 mA / DC 0–20 mA |
| Resolution | 12-bit (1/4000 of full scale) |
| Conversion Speed | 6 ms / 4 channels (15 ms max) |
| Input Impedance | Voltage: 200 kΩ; Current: 250 Ω |
| Accuracy | ±0.5% of full scale (at 25 °C) |
| Isolation | Photocoupler isolation between channels and PLC bus |
| Power Consumption | 5 VDC, 30 mA (from FX3U main unit) |
| External Power Supply | 24 VDC ±10%, 40 mA (user-supplied) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | −25 °C to +75 °C |
| Humidity | 5% to 95% RH (non-condensing) |
| Weight | 180 g |
| Dimensions (W × H × D) | 40 × 90 × 87 mm |
| Applicable PLC | FX3U, FX3UC (with adapter) |
| Wiring | Removable terminal block |
| Certifications | CE, UL, cUL |
Why Engineers Specify This Model
- Dual-mode input flexibility: Each channel is individually configurable for voltage or current input via software — no hardware jumpers required — reducing wiring errors and commissioning time.
- High-resolution 12-bit conversion: Provides 4,000 discrete steps across the full input range, delivering the measurement granularity required for tight closed-loop process control.
- Fast scan cycle: 6 ms total conversion time for all 4 channels ensures analog data is refreshed within a single PLC scan, critical for responsive control loops.
- Galvanic isolation: Photocoupler isolation protects the FX3U CPU from ground loops and electrical noise common in industrial field wiring environments.
- Plug-and-play expansion: Connects directly to the FX3U main unit via the dedicated expansion bus — no special programming adapters or communication modules needed.
- GX Works2 / GX Developer compatible: Full parameter configuration and channel monitoring available through Mitsubishi’s standard engineering software.
Complete System Bill of Materials
A typical FX3U analog input application requires the following components:
- FX3U-32MR/ES (or equivalent FX3U CPU): Main PLC unit providing power bus and expansion connector
- FX3U-4AD (this module): 4-channel analog input expansion
- FX3U-232-BD or FX3U-USB-BD: Communication board for programming and SCADA connectivity
- FX3U-ENET: Ethernet module for CC-Link IE Field or SLMP communication (optional)
- 24 VDC Power Supply (e.g., Mitsubishi PS-5R-D24): External 24 V supply for FX3U-4AD field power
- Shielded twisted-pair cable: For analog signal wiring to transmitters and sensors
- DIN rail and terminal blocks: For panel mounting and field wiring termination
Compliance & Industry Standards
- CE Marking: Compliant with EU Low Voltage Directive (LVD) and EMC Directive — suitable for European machinery installations.
- UL / cUL Listed: Recognized for use in North American industrial control panels per UL 508A.
- IEC 61131-2: Programmable controller hardware conformance for analog input modules.
- RoHS Compliant: Manufactured without restricted hazardous substances per EU Directive 2011/65/EU.
- IP20 Enclosure Rating: Suitable for installation inside control cabinets; external enclosure required for harsh environments.
Quality Assurance & Sourcing
At Konmask.com, every Mitsubishi FX3U-4AD unit is sourced through verified supply channels and undergoes pre-shipment inspection:
- Authenticity verification against Mitsubishi Electric factory markings and date codes
- Functional power-on check and channel continuity test
- Anti-static packaging with humidity indicator card
- Traceable documentation available upon request (test report, COO)
- Minimum 90-day warranty on all units; extended warranty available for volume orders
How to Source This Part
- Add to Cart directly on this page for standard stock orders.
- Request a Quote for volume pricing (5+ units) — email support@konmask.com.
- Urgent / Emergency Orders: Call or WhatsApp +0086 19859288691 for same-day shipping confirmation.
- Custom Kitting: Need the FX3U-4AD bundled with a CPU, power supply, or communication module? Contact us for a complete BOM quote.
Application-Specific FAQ
Q: Can the FX3U-4AD read a 4–20 mA pressure transmitter directly?
A: Yes. Set the channel to current input mode (4–20 mA) in GX Works2. The module provides the 250 Ω burden resistor internally — no external shunt resistor is required.
Q: How many FX3U-4AD modules can I connect to one FX3U CPU?
A: Up to 8 special function modules can be connected to a single FX3U main unit, allowing a maximum of 32 analog input channels using FX3U-4AD modules alone.
Q: Is the FX3U-4AD compatible with the FX3UC CPU?
A: Yes, with the FX2NC-CNV-IF bus conversion adapter. Direct connection is not possible without this adapter due to the different expansion connector on the FX3UC.
Q: What is the difference between FX3U-4AD and FX2N-4AD?
A: The FX3U-4AD offers faster conversion (6 ms vs. 15 ms), higher accuracy, and is designed exclusively for the FX3U/FX3UC platform. The FX2N-4AD is for the older FX2N series and is not cross-compatible.
Q: Can I use this module with GX Developer instead of GX Works2?
A: Yes. GX Developer supports FX3U-4AD parameter configuration via the special function module setup wizard, though GX Works2 provides a more intuitive interface.
Q: Do you provide the FX3U-4AD manual or wiring diagram?
A: Yes. Contact support@konmask.com and we will provide the official Mitsubishi FX3U-4AD User’s Manual (JY997D16601) in PDF format.
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