Special Functions Of A Cpu 41X-H; Security Levels; Table 6- 1 Security Levels Of A Cpu - Siemens SIMATIC S7-400H System Manual

Special functions of a CPU 41x-H

6.1

Security levels

You can define a security level for your project in order to prevent unauthorized access to
the CPU programs. The objective of these security level settings is to grant a user access to
specific programming device functions which are not protected by password, and to allow
that user to execute those functions on the CPU. When logged on with a password, the user
may execute all PG functions.
Setting security levels
You can set the CPU security levels 1 to 3 under "STEP 7/Configure Hardware".
If you do not know the password, you can clear the set security level by means of a manual
memory reset using the mode selector. No Flash card must be inserted in the CPU when
you perform such an operation.
The following table lists the security levels of an S7–400 CPU.
Table 6- 1
CPU function
Display of list of blocks
Monitor variables
Module status STACKS
Operator control and monitoring
functions
S7 communication
Reading the time
Setting the time
Block status
Load in PG
Load in CPU
Delete blocks
Compress memory
Download user program to
memory card
Controlling selection
Modify variable
Breakpoint
Clear breakpoint
Memory reset
S7-400H
System Manual, 03/2012, A5E00267695-11
Security levels of a CPU
Security level 1
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Access granted
Security level 2 Security level 3
Access granted Access granted
Access granted Access granted
Access granted Access granted
Access granted Access granted
Access granted Access granted
Access granted Access granted
Access granted Access granted
Access granted Password required
Access granted Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
Password required Password required
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