S7-312 backup

[ConTexas 0]

Dear All, I need to perform a backup of CPU 312 6E67-312-1AE13-0AB0 V2.6.4. My Step7 is V5.4 (about the mentioned CPU I have only V2.6, not V2.6.4). So, as usually, I create a new project, then I try to transfer the program from PLC to PC. Obviously, the connection is working, I see the CPU, but after few seconds of connection I receive the message "D241 function not allowed in the actual protection level" (Message is in Italian). The help to message, 33:53825, refers to password protection (but I know that there isn't password) or key switch not in STOP, but it is in STOP. Other remarks: - actually the CPU is in fault state, not in run. - I am sure that the direction of transfer is PLC->PC - I see as loaded in EPROM all the program blocks, but trying to open OB1 online, I receive a message like "not possible to open". But the strange is that I only wish to read PLC, not write! Any suggestion will be appreciated. Thanks.

[JesperMP 2]

Maybe the MMC is corrupted. Investigate the diagnostics buffer. Apart from that, it does sound as the program as been password protected. I think the firmware version does not have to match exactly, but why not download the latest firmware from Siemens ?

[ConTexas 0]

Thanks for your answer. The CPU was working with the actual firmware, then it has stopped, so before to change the unit, I had to recover the program and the configuration inside the faulted CPU. But there was not way to perform the operation, due the reported error. I think that the CPU is damaged, I will try to investigate more. Regards.

[JesperMP 2]

Move the MMC card to the other CPU. If you need the program for backup, you can then try to upload from the other CPU.

[ConTexas 0]

Thanks JesperMP, but an other my target was to understand if, based on the described symptoms, I can say to my customer that the CPU is damaged. Now I cannot try nothing more, because the CPU was delivered to service. When the unit will be returned, I will communicate you what happened. Thanks again for your suggestions.