Know-How Protection - Siemens S7-1200 System Manual

If you want to allow access to CPU data from the client side, that is, you do not want to
restrict the communication services of the CPU, follow these steps:
1. Configure the protection access level to be any level other than "No access (complete
2. Select the "Permit access with PUT/GET communication" check box.
When you download this configuration to the CPU, the CPU permits PUT/GET
communication from remote partners
6.6.2

Know-how protection

Know-how protection allows you to prevent one or more code blocks (OB, FB, FC, or DB) in
your program from unauthorized access. You create a password to limit access to the code
block. The password-protection prevents unauthorized reading or modification of the code
block. Without the password, you can read only the following information about the code
block:
● Block title, block comment, and block properties
● Transfer parameters (IN, OUT, IN_OUT, Return)
● Call structure of the program
● Global tags in the cross references (without information on the point of use), but local
When you configure a block for "know-how" protection, the code within the block cannot be
accessed except after entering the password.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
protection)".
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Programming concepts
6.6 Protection
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