Know-How Protection - Siemens SIMATIC ET 200SP System Manual

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
Global data blocks and array data blocks
You can provide global data blocks (global DBs) with know-how protection. Users who do
not possess the valid password can read the global data block but not change it.
You cannot provide array data blocks (array DBs) with know-how protection.
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF
Protection
8.4 Know-how protection
137