Download Siemens S7-200PLC Specifications

Basic Concepts for Programming an S7-200 CPU
4.8
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 4-12, 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 the S7-200 CPU 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. If another user immediately connects to the CPU
within this time, he may have access to the programming device.
Table 4-12 Restricting Access to the S7-200 CPU
Task
Read and write user data
Start, stop and restart the CPU
Level 1
Not
restricted
ti t d
Level 2
Not
restricted
ti t d
Level 3
Not
restricted
ti t d
Read and write the time-of-day clock
Upload the user program, data, and the
configuration
Download to the CPU
Delete the user program, data, and the
configuration
Password
required
Password
required
i d
Force data or single/multiple scan
Copy to the memory cartridge
Write outputs in STOP mode
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
4-27