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ET200M***大可以扩展 8 或 12 个 S7-300 的模块；ET200M中接口模块后允许***多插入8个300输入模块。
<ET200M能扩展多少个模块》
http://www.ad.siemens.com.cn/productportal/prods/published/PCS7_TOP_V2/PROFIBUS/ET200M/ET200M_Extend.htm
《CP342-5 (M)与ET200M(S)之间的DP主从通信（STEP7）》
http://www.ad.siemens.com.cn/productportal/prods/published/Comm/Comm_2.10/Comm_2.10.html
<S7-300集成PN口作为Profinnet控制器使用（STEP7）>
http://www.ad.siemens.com.cn/productportal/prods/published/Comm/Comm_10.9/Comm_10.9.html
<Profinet通信>
http://www.ad.siemens.com.cn/productportal/prods/published/300list/Comm_list10.html
<300通信>
http://www.ad.siemens.com.cn/productportal/prods/published/300list/comm_list0.html
ET200M导轨的订货号参考文档
<ET200M订货号与备件兼容性>
http://www.ad.siemens.com.cn/productportal/prods/published/PCS7_TOP_V2/PROFIBUS/ET200M/ET200M_Order_Compatibility.htm
http://www.ad.siemens.com.cn/productportal/prods/published/Comm/Comm_10.9/Comm_10.9.html
<Profinet通信>
http://www.ad.siemens.com.cn/productportal/prods/published/300list/Comm_list10.html
<300通信>
http://www.ad.siemens.com.cn/productportal/prods/published/300list/comm_list0.html
ET200M导轨的订货号参考文档
<ET200M订货号与备件兼容性>
http://www.ad.siemens.com.cn/productportal/prods/published/PCS7_TOP_V2/PROFIBUS/ET200M/ET200M_Order_Compatibility.htm
