上比200更加丰富些，通信上采用了集成PN接口，不在需要特殊的编程线。
2、S7-1200集成以太网口，如果是做以太网通讯一个S7 1200比S7200+CP243成本低，性能介于200和300之间；S7 1200编程方式与300相似，熟悉S7-300的技术员使用S7-1200很快就能上手。
SIEMENS伺服电动机定子的构造基本上与电容分相式单相异步电动机相似.其定子上装有两个位置互差90°的绕组，一个是励磁绕组Rf，它始终接在交流电压Uf上；另一个是控制绕组L，联接控制信号电压Uc。所以交流伺服电动机又称两个伺服电动机。
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