Detailed analysis of Mitsubishi FX3UPLC 3 kinds of output wiring

For the Mitsubishi FX3U PLC, the output module is categorized into three types: relay output, transistor output, and thyristor output. Among these, the transistor output can be further divided into two configurations: source type and sink type. Understanding the differences between these output types is crucial for proper wiring and system design. 1. **Relay Output Wiring**: When working with a relay output PLC, it's essential to pay attention to the voltage range during wiring. For DC applications, a maximum of 30V DC should be used, while for AC applications, a power supply of up to 240V AC is typically required. The wiring configuration for relay outputs is straightforward but must be done carefully to avoid damaging the PLC or connected devices. A typical wiring diagram is shown below:

2. **Transistor Output**: The transistor output of the FX3U operates on a DC voltage range of 5V to 30V. To determine whether an output is a source or sink type, you can look at the direction of current flow. In a **sink output**, the current flows from the load to the PLC output, whereas in a **source output**, the current flows from the PLC output to the load. This distinction is important when connecting external devices such as sensors or actuators. To help visualize the difference, the following diagrams illustrate both configurations:

**Sink Wiring Configuration**: In this setup, the PLC output acts as a "drain," allowing current to flow out through the load. This is commonly used when the external device requires a common ground connection.

**Source Wiring Configuration**: Here, the PLC output functions as a "source," providing current to the load. This configuration is often used when the load is connected to a separate power supply.

3. **Thyristor Output**: The thyristor output type is designed for AC applications and typically supports voltages of 100V or 200V AC. Unlike DC outputs, thyristor outputs do not require polarity consideration due to the nature of AC power. This makes them ideal for controlling AC loads such as lamps or motors. The thyristor output type is usually labeled as S/ES in the FX3U series.

Understanding the differences between these output types allows users to make informed decisions when selecting and wiring their PLC systems, ensuring safe and efficient operation.

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