因为变频器本身不具有PROFIBUS-DP通讯的功能，需要外加通讯板卡，这样变频器才能支持PROFIBUS-DP协议
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S7-1200/.../DEMO Project S7-1200.ap10 S7-1200/.../Settings.xml S7-1200/.../PEData.idx S7-1200/.../Siemens.Automation.DomainModel.xml S7-1200/.../Main.xml S7-1200/.../PEData.plf
