知识，因此系统开发周期短，现场调试容易。另外，可在线修改程序，改变控制方案而不拆动硬件。功能强，性能价格比高，一台小型PLC内有成百上千个可供用户使用的编程元件，有很强的功能，可以实现非常复杂的控制功能。它与相同功能的继电器系统相比，具有很高的性能价格比。PLC可以通过通信联网，实现分散控制，集中管理。硬件配套齐全，用户使用方便，适应性强主电路是给异步电动机提供调压调频电源的电力变换部分，变频器的主电路大体上可分为两类：电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容。郑工199 5928 1761
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