Mitsubishi FX3U-8AV-BD Analog Setpoint Board for MELSEC-F FX3U Series

The Mitsubishi FX3U-8AV-BD is an analog setpoint expansion board designed for Mitsubishi Electric MELSEC-F series programmable logic controllers, specifically the FX3U series PLC main units. This compact function expansion board integrates eight rotary trimmer potentiometers, allowing operators, engineers, and maintenance personnel to perform direct, manual parameter adjustments without requiring an external programming tool, PC interface, or dedicated human-machine interface. Operating entirely on a 5 V DC power supply drawn internally from the connected PLC main unit, the FX3U-8AV-BD converts the physical wiper positions of the eight onboard potentiometers into internal digital values accessible by PLC application logic. These variable inputs are typically used to regulate timer settings, counter presets, speed references, calibration offsets, and threshold limits across automation processes. Engineered for seamless integration, the board installs directly into the front expansion slot of the FX3U base unit in standard DIN-rail control enclosures. Typical applications include packaging machinery, conveyor routing systems, assembly automation, and general manufacturing equipment where quick, field-level tuning of machine parameters is required during production and commissioning.