The FX0N-3A module is an analog special function block in the Mitsubishi FX series PLC family, offering two analog input channels and one analog output channel. This device enables seamless conversion of analog signals to digital data for PLC processing and vice versa. Below is a detailed breakdown of its features and applications based on the provided manual:

    Analog Conversion: The FX0N-3A supports two analog input channels and one analog output channel, with an 8-bit resolution. Inputs can be configured to receive either voltage or current signals, depending on the user’s wiring setup.
    Compatibility: This module can be connected to the FX2N, FX2NC, FX1N, and FX0N PLC series, making it versatile for integration into various industrial applications.
    Data Communication: Communication between the PLC and the FX0N-3A occurs through TO/FROM instructions, with data protection supported by photo-coupler isolation.

Electrical Specifications

    Voltage and Current Input: The module supports input ranges of 0-10V or 4-20mA, and for current inputs, a 250Ω resistor is used to convert the signal.
    Output Capacity: The analog output is 0-10V or 4-20mA, adjustable with offset and gain calibrations.
    Power Consumption: Consumes 30mA at 5V DC and 90mA at 24V DC. It occupies 8 I/O points on the PLC's expansion bus.

Installation and Wiring

    Wiring Guidelines: The analog channels do not have separate isolation. Care must be taken when wiring to prevent electrical noise; additional capacitors (0.1 to 0.47 µF) may be installed if voltage ripples are observed.
    Current and Voltage Selection: The choice between voltage and current input/output is based on wiring configurations. Ensure proper connections to VIN or IIN for current inputs and avoid connections between VOUT and IOUT when current output is used.

Configuration and Buffer Memory

    Buffer Memory Allocation: Different buffer memories (BFMs) are dedicated to various operations, including input and output value storage, A/D, and D/A process initiation. Adjustments to calibration can be made using BFMs to achieve accurate analog readings and outputs.

Calibration Procedures

    Analog Input Calibration: Calibration for A/D conversion requires setting offset and gain. Users can adjust the A/D OFFSET and GAIN potentiometers to obtain accurate analog readings.
    Analog Output Calibration: Similar adjustments can be made on the D/A side to ensure the output aligns with the required voltage or current values.

Commissioning and Recommendations

To achieve reliable performance, adhere to the following best practices:

    Initial Calibration: Ensure accurate calibration of offset and gain settings during installation.
    Noise Reduction: Use shielded cables and proper grounding to mitigate noise interference, which is especially critical for analog signals.
    Maintenance: Regularly inspect the wiring and verify that all connectors are secure, especially in high-vibration environments.

This module is ideal for applications requiring precise analog input and output control, commonly found in process automation, temperature control, and monitoring applications in the industrial sector.

>> Mitsubishi FX0N-3A User manual (pdf)

----------

+ Mitsubishi Automation Homepage

+ Mitsubishi Electric Contact (for Automation Mall)

+ About Mitsubishi Electric