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Password for Blocks

Created by: mehrdad.a at: 5/11/2008 6:30 AM (7 Replies)

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5/11/2008 6:30 AM	Rate (0)
mehrdad.a Posts: 39 Rating: (0)	Hi how can i consider password for blocks(OB,FC,FB) in the ladder,FDB program? thanks
mehrdad.a Posts: 39 Rating: (0)
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5/11/2008 7:12 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 12/25/2025 Posts: 12474 Rating: (2722)	Hello mehrdad.a; Blocks that have the Know-How Protect attribute activated cannot be opened by the user (not even by the person that programmed it). But that is the official story, there are ways to crack the protection. So you must consider carefully the reasons that you need this protection. Siemens usually uses them to ensure standard operation of the blocks they provide. If anyone could modify the code for SFC20 (BLKMOV) then how could they state that it can be used speciffically for a certain type of application, and not for others? If you need to password protect the whoe program, for commercial issues, better to look iinto password protecting the CPU (and keep the password handy!). This being said, to Know-How protect a certain block, you must generate a source file for this block using the "Generate Source File" function in the program editor. You will then find this source in the Source subfolder of the Programs folder. Open it with any word processor, add the words Know-How Protect on a line after the block number save the file, right click the file in the Source folder and compile it. It will now be available as a protected block in the Blocks subfolder. Remember to keep a copy of the unprotected source, as the protected block cannot (theoretically) be opened, not even by you. Any further modification would mean opening the unprotected source, modifying this, and recompiling under the same block name to overwrite the protected block. Hope this helps, Daniel Chartier.

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7/12/2012 6:03 AM	Rate (0)
A Shah Advanced Member Joined: 11/12/2011 Last visit: 7/2/2025 Posts: 29 Rating: (0)	Hello, Thanks for information. Do u have any idea, if i want to unprotect the block which was locked by other andi dont have Source file. Please help!!

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7/12/2012 9:18 AM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 10/16/2025 Posts: 10239 Rating: (1183)	A Shah Hello, Thanks for information. Do u have any idea, if i want to unprotect the block which was locked by other andi dont have Source file. Please help!! OFT Why do you want to do it? Is not enough just to use the block? Best regards, Hristo Mihalev

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7/12/2012 10:07 AM	Rate (0)
A Shah Advanced Member Joined: 11/12/2011 Last visit: 7/2/2025 Posts: 29 Rating: (0)	Friends, i have a program with protected block, and now i want see inside how is the operation is carried out. so i can made some changes as per my requirement. And this blocks are protected by programmer only, not siemens protected block.
	Last edited by: A Shah at: 7/12/2012 10:08 AM
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7/12/2012 11:04 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 12/25/2025 Posts: 12474 Rating: (2722)	Hello A.Shah; I am afraid that whoever inserted the Know-How-Protect keyword into the original sourcefile, whether it be Siemens or a subsequent programmer, you cannot open a protected block.There is no legal way to do so... Remember to keep a copy of the unprotected source, as the protected block cannot (theoretically) be opened, not even by you Hope this helps, Daniel Chartier

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7/13/2012 5:07 AM	Rate (0)
A Shah Advanced Member Joined: 11/12/2011 Last visit: 7/2/2025 Posts: 29 Rating: (0)	Thanks a lot

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11/23/2018 3:18 PM	Rate (0)
javiermorales Bronze Member Joined: 12/13/2011 Last visit: 10/1/2024 Posts: 146 Rating: (6)	hi i use the block privacy https://support.industry.siemens.com/cs/ww/en/view/45632073
	Last edited by: Jen_Moderator at: 11/24/2018 9:34:25 PM Optimized link.
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