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S7-300and400ladderprogrammingmanual
- 西门子S7-300和S7-400的梯形图编程手册,供需要的人参考-Siemens S7-300 and S7-400 of the ladder programming manual for those who need it for reference
S7-200technical-manual
- 西门子s7-200plc技术手册,对于学习PLC编程者很实用- Siemens s7-200 technical manual