Posted 15 Oct 2016 Have forgot the password for S7300 plc in simatic manager step7 , thus i am not able to go online or upload any changes . Share this post Link to post Share on other sites
Posted 16 Oct 2016 The CPU use MMC card or it is an old version of CPU? Share this post Link to post Share on other sites
Posted 17 Oct 2016 Contact Siemens technical support. They may have a way to allow you to erase the PLC and start over. But if you need to get online and keep the program that's in it, you will need to know the password. Share this post Link to post Share on other sites
