Configuring System Security - Siemens SIMATIC S7 System Manual

6.1.6

Configuring system security

Click the Security node of the system block (Page 133) dialog to configure a password and
security settings for the CPU.
The password can be any combination of letters, numbers, and symbols and is case-
sensitive.
Password-protected privilege levels
The CPU offers four levels of password protection, with "Full Privileges" (Level 1) providing
unrestricted access and "Disallow Upload" (Level 4) providing the most restricted access.
The default condition for the S7-200 SMART CPU is "Full Privileges" (Level 1).
A CPU password authorizes access to CPU functions and memory. With no CPU password
downloaded ("Full privileges" (Level 1)), the S7-200 SMART CPU allows unrestricted
access. If you have configured higher than "Full Privileges" (Level 1) access and
downloaded a CPU password, the S7-200 SMART CPU requires password entry for access
to CPU operations as defined in the table below.
The "Disallow Upload" (Level 4) password restriction protects the user program (your
intellectual property) even if the password becomes known. You can never upload in Level 4
and can only change the privilege level if there is no user program present in the CPU. As a
result, you can always protect your user program, even if someone discovers your password.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
6.1 Configuring the operation of the PLC system
PLC device configuration
143