Creating A Password For The Cpu - Siemens Simatic S7-200 System Manual

Basic Concepts for Programming an S7-200 CPU
6.7

Creating a Password for the CPU

All models of the S7-200 CPU provide password protection for restricting access to specific
CPU functions. A password authorizes access to the CPU functions and memory: without a
password, the CPU provides unrestricted access. When password protected, the CPU
prohibits all restricted operations according to the configuration provided when the password
was installed.
Restricting Access to the CPU
As shown in Table 6-1, S7-200 CPUs provide three levels of restricting access to CPU
functions. Each level allows certain functions to be accessible without a password. For all
three levels of access, entering the correct password provides access to all of the CPU
functions. The default condition for S7-200 CPUs is level 1 (no restriction).
Entering the password over a network does not compromise the password protection for the
CPU. Having one user authorized to access restricted CPU functions does not authorize
other users to access those functions. Only one user is allowed unrestricted access to the
CPU at a time.
Note
After you enter the password, the authorization level for that password remains effective for
up to one minute after the programming device has been disconnected from the CPU.
Table 6-1 Restricting Access to the S7-200 CPU
Read and write user data
Start, stop and restart the CPU
Read and write the time-of-day clock
Read the forced data in the CPU
Upload the user program, data, and the configuration
Download to the CPU
Delete the user program, data, and the configuration
Force data or single/multiple scan
Copy to the memory cartridge
1
The "Delete" protection can be overridden by the Clear password, ''clearplc".
Configuring the CPU Password
You use STEP 7-Micro/WIN to create the password for the CPU. Select the menu command
CPU Configure and click the Password tab. See Figure 6-10. Enter the appropriate level
of access for the CPU, then enter and verify the password for the CPU.
6-14
Task
1
S7-200 Programmable Controller System Manual
Level 1 Level 2
Not restricted Not restricted Not restricted
Password
required required
C79000-G7076-C230-02
Level 3
Password
required required