断电有过，断电后RAM数据肯定是清除了，我查了保持存储区，没有啥特别设定，换之前MB0-MB15做个记录

保持区设定.bmp

CPU简介 没有flash ROM

Work memory 2048KB; 0.004ms/1000 instructions; PROFINET connection; S7 communication (loadable FBs/FCs);  PROFINET IO-Controller; supports RT/IRT; PROFINET interface and 2 ports; MRP; PROFINET CBA; PROFINET CBA-Proxy; TCP/IP transport protocol; combined MPI/DP connection (MPI or DP master or DP slave); multiline structure up to 32 modules; constant DP bus cycle time; routing; firmware V3.2

感谢yming大师，还有啥需要注意的细节，给与指点，谢谢！