一般交流电压波动在+10%(+15%)范围内，可以不采取其它措施而将 PLC 直接连接到交流电网上去。初研制生产的 PLC 主要用于代替传统的由继电器接触器构成的控制装置，但这两者的运行方式是不相同的：继电器控制装置采用硬逻辑并行运行的方式
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