Siemens SIMATIC S7-400H, Системное руководство

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S7-400H
System Manual, 03/2012, A5E00267695-11
77
Special functions of a CPU 41x-H
6
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 Security levels of a CPU
CPU function Security level 1 Security level 2 Security level 3
Display of list of blocks Access granted Access granted Access granted
Monitor variables Access granted Access granted Access granted
Module status STACKS Access granted Access granted Access granted
Operator control and monitoring
functions
Access granted Access granted Access granted
S7 communication Access granted Access granted Access granted
Reading the time Access granted Access granted Access granted
Setting the time Access granted Access granted Access granted
Block status Access granted Access granted Password required
Load in PG Access granted Access granted Password required
Load in CPU Access granted Password required Password required
Delete blocks Access granted Password required Password required
Compress memory Access granted Password required Password required
Download user program to
memory card
Access granted Password required Password required
Controlling selection Access granted Password required Password required
Modify variable Access granted Password required Password required
Breakpoint Access granted Password required Password required
Clear breakpoint Access granted Password required Password required
Memory reset Access granted Password required Password required