Using The User Program To Set Additional Access Protection; Know-How Protection - Siemens Simantic ET200SP System Manual

Access levels for F-CPUs
For the fail-safe CPUs, there is an additional access level in addition to the four described
access levels. For additional information on this access level, refer to the description of the
fail-safe system SIMATIC Safety Programming and Operating Manual SIMATIC Safety -
Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126).
8.3

Using the user program to set additional access protection

Access protection via user program
You can also restrict access to a password-protected CPU in STEP 7 via the ENDIS_PW
operation. You can find a description of this block in the online help under the keyword
"ENDIS_PW: Limit and enable password legitimation".
8.4

Know-how protection

Application
You can use know-how protection to protect one or more OB, FB or FC blocks as well as
global data blocks in your program from unauthorized access. Enter a password to restrict
access to a block. The password offers high-level protection against unauthorized reading or
manipulation of the block.
Readable data
If a block is know-how protected, only the following data is readable without the correct
password:
● Block title, comments and block properties
● Block parameters (INPUT, OUTPUT, IN, OUT, RETURN)
● Call structure of the program
● Global tags without information on the point of use
Further actions
Further actions that can be carried out with a know-how protected block:
● Copying and deleting
● Calling in a program
● Online/offline comparison
● Load
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
8.3 Using the user program to set additional access protection
Protection
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