Posted 8 Oct 2021 Hi all, My system is using PLC S7-300. Now, it is being SF fault. I followed the manufacturer's sf error instructions. I replaced the CPU Module, but it is still fault. Diagnostic of Simatic announced I/O can't access for reading and writing. Please give a solution, thanks Sincerely. Share this post Link to post Share on other sites
Posted 14 Nov 2021 Hi, are you sure you assigned the right hardware in the hardware configuration with the cooresponding 6ES7 numbers? Share this post Link to post Share on other sites