用编程软件诊断，也可以利用相关的特殊存储器SMB 在程序中检测
https://www.ad.siemens.com.cn/productportal/prods/s7-200-smart-portal/200smarttop/communication/Ethernet/PROFINET/diag1.htm
更多关于 PROFINET
S7-200 SMART PROFINET通信
http://www.ad.siemens.com.cn/productportal/prods/s7-200-smart-portal/200smarttop/smartsms/076.html
1、SMART 200 PLC可以和ET200 SP模块走PN通讯
《S7-200 SMART 作 PROFINET 控制器带“标准”IO设备》
https://www.ad.siemens.com.cn/productportal/prods/s7-200-smart-portal/200smarttop/communication/Ethernet/PROFINET/SMART_ET200SP/ProfinetIODevice.html
2、《PROFINET通信诊断》
https://www.ad.siemens.com.cn/productportal/prods/s7-200-smart-portal/200smarttop/communication/Ethernet/PROFINET/diag1.htm