Hi Siemens community,

I  have some questions regarding a password protected s7-300 CPU:

1) what will happen when we transfer the MMC from a password protected S7-300 CPU to a new identical CPU? Will the hardware configuration stored on the load memory of the MMC transfer to the new CPU and will it also automatically get password protected? What will be the reaction of the new CPU?

2) Can we, for backup purposes, mirror the password protected MMC with a prommer and just put it in a new CPU and will it work without knowing the password?

3) when we use the existing MMC (or mirror the MMC) and place it into a new CPU, will all retainable variables be loaded into the new CPU? (I guess it will since it's on the load memory thus the MMC?) 

I've been looking in the forum for a appropriate answers but haven't found it yet.

Hope someone can help me out, thank you.

Best regards,
J

Hello,

do you mean the password for F-CPU? In this case I had an issue a few years ago with the MMC. We can´t get access to the CPU and we could not copy the content from one MMC to the next (with a PG unit). So we deleted a MMC inserted it to the CPU and transferred the project with the PG.

Maybe you just try if you can.

Scott

Hello Scott,

thanks for you reply.

However, I mean a regular CPU not a fail-safe.

Best regards

I've found this piece of info on another forum. Can someone confirm this is correct?

Message from other forum

The PLC is S7-313 (313-5BE00-0AB0) and fitted with an MMC (Micro Memory Card)

I received the following in an email from Siemens Singapore:
1) The New CPU does not have a battery and the MMC is alway necessary for the CPU to be in operation.
2) CPU will go to stop mode if the MMC is remove.
3) In any case the system configuration ( hardware configuration + program + network configuration) is stored in the MMC card.
If you insert MMC to another CPU and power up the first action is all the data is loaded from the MMC to the CPU.
Thus the CPU will also be password protected.
In future even all the comment will be save in the MMC thus all documentation will be store digitally.

Hello,

it's from Siemens Singapore Support so why not to believe?