Mitsubishi FX3U-4AD MELSEC-F 4‑Channel Analog Input Module

Mitsubishi Electric FX3U‑4AD is a 4‑channel analog input special function block for FX3U series PLC systems, designed to convert analog signals from sensors and field devices into digital values for process monitoring and control. Supports both voltage and current inputs, with each of the 4 channels individually configurable. High‑speed 500 µs A/D conversion per channel ensures responsive measurement across all inputs. Built‑in digital filter and peak hold functions support stable readings and transient signal capture. Buffered memory (BFM) data transfer speed is up to 4‑5 times faster than conventional models.

Applications:

• Analog signal acquisition from pressure, flow and level sensors

• Process monitoring and control in industrial automation systems

• Data acquisition for packaging machinery, material handling and textile equipment

• Machine automation requiring four mixed signal inputs

Core Specifications:

• Number of analog inputs: 4 (channel‑independent configurable)

• Voltage input ranges: –10 to +10 V DC (input resistance 200 kΩ, absolute max ±15 V)

• Current input ranges: –20 to +20 mA / 4 to 20 mA DC (input resistance 250 Ω, absolute max ±30 mA)

• Digital output resolution (voltage): 15‑bit binary + sign (0.32 mV)

• Digital output resolution (current): 14‑bit binary + sign (1.25 μA)

• A/D conversion time: 500 μs × number of channels used

• Data transfer speed: 4‑5× faster than conventional models

Advanced Specifications:

• Total accuracy (voltage, 25 °C ± 5 °C): ±0.3% (±60 mV) for 20 V full scale

• Total accuracy (voltage, 0 … 55 °C): ±0.5% (±100 mV) for 20 V full scale

• Total accuracy (current, 25 °C ± 5 °C): ±0.5% (±200 μA) for 40 mA full scale

• Total accuracy (current, 0 … 55 °C): ±1.0% (±400 μA) for 40 mA full scale

• Insulation: Photocoupler isolation between analog input area and PLC; DC/DC converter isolation for power supply

• Functions: Digital filter, peak hold, offset/gain adjustment

• Occupied I/O points: 8 (countable as either inputs or outputs, not affecting PLC max I/O)

• Power supply: 5 V DC 110 mA (from main unit), 24 V DC ±10% 90 mA (external)

Compatibility information:

• Compatible controllers: FX3G, FX3GE, FX3GC, FX3U, FX3UC series PLCs

• For connection to FX3UC or FX3GC, use FX2NC‑CNV‑IF or FX3UC‑1PS‑5V adapter

• For connection to FX5U, use FX5‑CNV‑BUS or FX5‑CNV‑BUSC adapter

• Does not require I/O point allocation from PLC’s maximum I/O point count

Physical & Environmental Specifications:

• Dimensions (H × W × D): 90 mm × 55 mm × 87 mm

• Weight: 0.2 kg

• Mounting: DIN rail

• Connection: Screw‑clamp terminal block

• Ambient operating temperature: 0 °C … 55 °C

• Storage temperature: –25 °C … 75 °C

• Certifications: CE, UL/cUL, KC, EMC

Standards & Compliance:
CE, UL/cUL, KC, EMC.

Related Products:

• FX3U‑4AD‑ADP – 4‑channel analog input adapter (0‑10 V / 4‑20 mA, 12‑bit / 11‑bit)

• FX3U‑4DA – 4‑channel analog output module

• FX3U‑4AD‑PT‑ADP – 4‑channel Pt100 temperature input adapter

• FX3U‑4AD‑TC‑ADP – 4‑channel thermocouple input adapter (K, J)