Hi, I'm hoping someone here can help me to reset a 1215C CPU (215-1HG40-0XB0).

I had no problems with the CPU to begin with. I configured the devices in TIA portal v19, wrote my program and uploaded successfully. I then noticed the HMI (KTP700 Basic) graphics were not getting values from the PLC tags.

After trying many options I tried changing the access levels/security for the HMI. While following a tutorial I set an access level on the CPU. I know the password I chose was 1234 but when asked for the password to connect to the CPU in TIA portal it states it has to be 8 characters, one upper case, etc. Now I cannot access the CPU.

I have worked through resetting the CPU with a siemens memory card (6ES7954-8LC03-0AA0)  but nothing removes the password request.

I created a new project with the correct CPU (with no access restrictions) in TIA portal v19, inserted the memory card in the PC and set to 'Transfer' mode, in TIA portal. I then dragged the CPU information 'PLC_1' onto the memory card. Removed the card from the PC memory slot. With the CPU powered off I inserted the memory card, powered on the CPU, watched the LEDs until STOP/RUN LED is yellow and on constantly, maintenance LED flashing yellow. Then powered down the CPU and removed the memory card. Restarted the CPU, the only led on is the STOP/RUN indicator which is yellow and on constantly. When I try to connect to the CPU with TIA portal the access level password is still there. Any other ideas to reset the CPU access password?

Any help appreciated.

Hi,

I created a new project with the correct CPU (with no access restrictions) in TIA portal v19, inserted the memory card in the PC and set to 'Transfer' mode, in TIA portal. I then dragged the CPU information 'PLC_1' onto the memory card.

try it again and do it as described in the manual. If the card is used to reset a lost password, there is no need to drag&drop an "empty" cpu to the card. The manual stops at step 4. Delete the files described in the manual in beforehand.

SIMATIC S7 S7-1200 Programmable controller

regards

sancruz