How to lock the PLC block - Database & Sql Blog Articles

SMD aluminum electrolytic capacitor

Programmable Package SG-8018CA(SG7050C) 0.67M~170M

RF cable can be customized for other specifications

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

How to lock the plc block
FB, FC block A: First, open the protection protection option of the CPU in the hardware configuration, select the third setting (read-write protection), save the compiler after setting the password and re-download the hardware configuration.
Second, in Step7, you can open a piece arbitrarily, select "GenerateSource" or shortcut "Ctrl+T" in "file", pop up a screen, fill in "objectname" like "tt", then press OK to confirm, it will Then another screen pops up. On the left is all the blocks in your program. If you need to protect which blocks, move them to the right, then exit all the blocks and enter the SIMATICManager.
Find the file tt in S7ProgramSources, double-click tt to open, add "Know_How_Protect" in the fourth line, then compile, save the file without error. In this way, FB1 and FB2 are protected. If you want to remove the protection, you can remove the "Know_How_Protect" compiled and saved in tt.

Note: Do not lose or delete the source file (such as tt), otherwise the program is protected, the user can save it to another directory, or ExportSource to the hard disk, and then delete the source file, so that others can only see unprotected blocks.
1. Open the program editing window LAD/FBD/STL;
2. Convert the block generation to be cryptographically protected to a source code file (generated by selecting menu File->Generatesource);
3. Close your program block in the LAD/FBD/STL window and open the source file generated in the previous step in the source folder of the SIMATICManager project management window;
4. In the declaration section of the block, enter "KNOW_HOW_PROTECT" in the line below the TITLE line;
Compile);?Save, File?5. Save and compile the source file (select menu File
6. Now complete the encryption protection of your block;
The following figure shows how to encrypt the STLsource file:

Unencrypted block protection
1. Open the Source file of the program block;
2. Delete KNOW_HOW_PROTECT in the file;
3. Save and compile the source file;
4. The encryption protection of the block has now been canceled.