普通的高炉卷扬用无编码器矢量控制也可以，具体看实际工艺要求，另外在PLC里做闭环行吗/西门子有替代方案但没实践过，
For CU240S application that encoder is essential ?????????CU240S???:

x S110 of CU305 can be the replaceable solution, please contact MC APC for further application help.
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Ё??http://support.automation.siemens.com/CN/view/zh/57106848