最佳答案
MM440与PROFIBUS-DP通讯控制说明及例程下载——
http://www2.ad.siemens.com.cn/Download/Upload/AS/application/A0049.pdf
http://www2.ad.siemens.com.cn/download/Upload/MC/faq/8894584.zip
http://www2.ad.siemens.com.cn/download/Upload/AS/application/A0279.pdf
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