Siemens SIMATIC ET 200AL System Manual page 1190

Basic procedure
1. Creating a SIMATIC memory card with "SET PASSWORD" job
This action creates a folder and file structure following a special pattern and writes a
password for the protection of the confidential PLC configuration data as plain text to a
special file on the SIMATIC memory card. See description below.
2. Insertion of a prepared SIMATIC memory card in the CPU and switch on the CPU.
The PLC reads the password, processes it and stores the result in the internal memory. Any
existing entry is overwritten.
3. Remove the SIMATIC memory card and restart the CPU.
Results (S7-1500): While the CPU is reading the SIMATIC memory card, the LED shows the
same behavior as with a firmware update. The RUN/STOP LED flashes while the CPU is
setting the password. After the process has been completed successfully, the RUN/STOP
LED lights up yellow and the MAINT LED flashes yellow.
The result of the operation is displayed in the diagnostics buffer as success or error message.
If the password could not be set, the error LED flashes together with the other LEDs.
Creating a SIMATIC memory card with "SET PASSWORD" job
1. Create a folder in the root directory named "SET_PWD.S7S".
2. Create a text file named "PWD.TXT" with the password as text-only in the folder just created
on the memory card.
3. Create a text file named "S7_JOB.S7S" in the root directory of the memory card with the
content "SET_PWD".
This file is the "Job file" for assigning a password for the protection of the confidential PLC
configuration data of the PLC.
4. The file structure on the SIMATIC memory card then looks as follows:
Note
Safe storage of the SIMATIC memory card
Store the SIMATIC memory card in a safe location to which only authorized persons have
access.
Communication
Function Manual, 05/2021, A5E03735815-AJ
Communications services
3.6 Secure Communication
69