德国西门子（SIEMENS）公司生产的可编程序控制器在我国的应用也相当广泛，在冶金、化工、印刷生产线等领域都有应用。西门子（SIEMENS）公司的PLC产品包括LOGO、S7-200、S7-1200、S7-300、S7-400、S7-1500等。 西门子S7系列PLC体积小、速度快、标准化，具有网络通信能力，功能更强，可靠性高。S7系列PLC产品可分为微型PLC（如S7-200），小规模性能要求的PLC（如S7-300）和中、高性能要求的PLC（如S7-400）等。
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