Siemens Simatic S7 Series System Manual

PLC device configuration
6.1 Configuring the operation of the PLC system
S7-200 SMART
124 System Manual, 09/2015, A5E03822230-AC
6.1.6
Configuring system security
Click the Security node of the system block (Page 115) 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.

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.