active time for password protection on s7400 plc

hi,

I think it depends on how long you are not accessing the device with your PG. I don´t remember in particular but I think when you are not accessing the PLC with this PG for an hour, you have to type  in the password again.

have a try,

regards,

Ziemens

Kindly, we did as below to have password protection on an s7400 plc program. But, when we access the blocks online, it asks for the password one time only, and then we can work all day on the program.

Is there some time limit, after which the system asks for the password again ?

Or it comes only after a power off on cycle ?

How can you activate the protection level with a password in the HW Config for an S7 CPU

https://support.industry.siemens.com/cs/us/en/view/10154913

1. Double-click the CPU to open the properties of your CPU in the hardware configuration.
2. Switch to the "Protection" tab and parameterize the desired protection level.
3. Close the the dialog with OK and save and compile the HW Config.
4. Load the HW Config into the CPU.

 Hello,

Password protection timeout is not mentioned in manuals and also it is not adjustable.

As per my experience, yes you can enter the password once, and then you can work whole the day. Or to be more accurate, "Once per each access". It means whenever you are asked for a password and enter it, you can access the CPU, monitor, download, upload, but once communication with the CPU is not established, you will be asked once again. 

Communication that is not established may be due to several reasons like closing Simatic Manager, Restart PC, Change settings in Set PG/ PC interface, ....etc. 

Hope this helps.

hi,

now I got it.

first I thougth it depends on the HW. But I had a look into the manuals of Safety Advanced:

Safety Advanced

Validity of access permission for the F‑CPU

Access permission for the F‑CPU remains valid until the project is closed inSTEP 7or access permission is canceled.

 and Distributed Safety:

unknown user

Validity/Revoking the Access Permission for the F-CPU

Access permission for the F-CPU is valid untilSIMATIC Manageris closed, permission is revoked using thePLC > Access Rights > Cancelmenu command, or the last S7 application is closed.

 

But as you see, both SW are acting same.

That means, that each client, who is accessing the CPU, has access until it is closed.

hope this helps,

regards,