There are various series of Siemens PLCs, and the wiring methods may differ between models. In this article, I'll focus on the S7-200 series. The S7-200 has different power supply options depending on the CPU model, such as CPU 221, CPU 222, CPU 224, CPU 224XP, and CPU 226. These models typically support either DC or AC power supply, and you can usually identify the type by the markings next to the terminal blocks.
For transistor output PLCs, there are generally two types of input and output configurations: sink type and source type. Understanding these is essential for correct wiring, as improper connections can cause current conflicts and potentially damage components.
1. **Sink Input**: The 1M terminal is connected to the negative side (-), while the input signal terminal is connected to the positive (+). This configuration allows current to flow from the input signal through the load to the 1M terminal.
2. **Source Input**: The 1M terminal is connected to the positive side (+), and the input signal terminal is connected to the negative (-). In this case, current flows from the 1M terminal through the load to the input signal.
3. **Sink Output**: The 1M terminal is connected to the negative side (-), and the load is connected between the input signal terminal and the positive side (+). This setup ensures that current flows through the load to the 1M terminal.
4. **Source Output**: The 1M terminal is connected to the negative side (-), while the 1L terminal is connected to the positive (+). The input signal terminal is connected to one end of the load, and the other end is connected to the negative side (-).
It's important to note that in some models, the common terminals (such as 1M and 2M) can have the same polarity. Always refer to the specific PLC manual for detailed wiring diagrams and instructions. Proper understanding of these configurations ensures safe and reliable operation of your Siemens S7-200 system.
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