In industrial automation, machine builders (OEMs) frequently apply the KNOW_HOW_PROTECT flag to Function Blocks (FBs) and Functions (FCs). This conceals their proprietary control logic from competitors and prevents unauthorized modifications. However, this security measure creates functional challenges for plant operators over time.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. S7 Can Opener - Runmode.com
The software does not permanently destroy protection attributes. It provides distinct and Unprotect buttons. This allows developers to remove a block's protection for immediate testing or code auditing, then safely re-apply the standard KNOW_HOW_PROTECT tag before deploying back to production. 3. Preserved Local Documentation Simatic S7 Can Opener V1.31 33
The Simatic S7 series is designed to automate industrial processes, including control, regulation, and monitoring tasks. These PLCs are equipped with a range of features, such as digital and analog inputs and outputs, communication interfaces, and programming capabilities. The S7 series includes several models, each tailored to specific requirements, such as the S7-1200, S7-1500, and S7-400.
If you work with legacy Siemens S7-300 or S7-400 PLCs, you have likely encountered the dreaded "Know-How Protection" on an FB or FC. Sometimes, you need to modify a parameter, but the original author or the system integrator is long gone. This public link is valid for 7 days
Easily unlock or relock blocks (OB, FB, FC) in S7 projects ( *.s7p ) and libraries ( *.s7l ).
: If the original compiled block retained system comments, they remain readable once unlocked. Technical Operational Workflow Can’t copy the link right now
Whether your protected blocks were originally written in .
S7 Can Opener is a third-party tool and is not an official Siemens product. Its developers specify that it should only be used by the of the software blocks for maintenance and recovery purposes. It is not intended for the reverse engineering of copyrighted software or for use where functional warranties are at risk. S7 Can Opener - Runmode.com
The author is not liable for any use of the software and takes no responsibilities for damages of any kind. Each copy is registered to each user by means of a unique serial code, and illegal copies can be tracked. Uploading the software to the Internet or BBS is strictly forbidden.
: If the original block was compiled with comments, they remain readable once the block is unlocked.