PLC产品已经标准化、系列化、模块化，配备有品种齐全的各种硬件装置供用户选用，用户能灵活方便地进行系统配置，组成不同功能、不同规模的系统。PLC的安装接线也很方便，一般用接线端子连接外部接线。PLC有较强的带负载能力，可以直接驱动一般的电磁阀和小型交流接触器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19959281761
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