Before we discuss how to open the can, we must understand the seal. Siemens TIA Portal offers several protection levels:
An S7 can opener primarily targets Know-How Protection. It’s important to note that these tools do not “crack” passwords via brute force in the traditional sense. Instead, they exploit legacy communication protocols or structural oversights in the compiled code.
The most famous free tool is the S7 Block Tool. Originally developed for Step7 Classic, newer forks support TIA Portal projects.
Implementing an S7 Can Opener in TIA Portal Top style means:
This method allows any TCP-capable device to exchange data with Siemens PLCs without licensed OPC servers or additional gateways.
Note: The term "Can Opener" is not an official Siemens function. It is industrial slang for breaking the closed S7 communication ecosystem. Always ensure proper security measures (VPN, network segmentation) when using raw TCP in production.
The S7 CanOpener (often referred to as S7CanOpener) is a specialized third-party utility designed to unlock protected blocks in Siemens SIMATIC S7 projects. It is primarily used for legacy Step 7 (v5.x) projects rather than modern TIA Portal environments. Core Functionality
According to resources like Runmode.com, the tool serves the following primary purposes:
Unlocking Protected Blocks: It removes the "know_how_protect" keyword from S7 blocks, allowing users to view and edit the code.
Library Support: It is compatible with both S7 programs (*.s7p) and S7 libraries (*.s7l).
Offline Operation: It operates strictly on project files stored on a hard disk. It cannot remove passwords set in the CPU hardware configuration or perform online operations to bypass PLC-level security. TIA Portal Compatibility & Limitations
While TIA Portal is the modern engineering software for SIMATIC S7-1200 and S7-1500 controllers, the S7 CanOpener has significant limitations regarding newer technology:
Block Privacy: It does not support the "Block Privacy" encryption introduced in Step 7 v5.5.
TIA Portal Projects: It is generally intended for legacy Step 7 projects. Modern TIA Portal blocks use different protection mechanisms that are typically not compatible with this specific tool. s7 can opener tia portal top
Reverse Engineering: While it can unlock a block, it may not be able to reconstruct the original source files for SCL or CFC blocks. Security Considerations
Using tools like S7 CanOpener to bypass protection may violate intellectual property agreements. Siemens has integrated more robust security features in TIA Portal, such as central user management and display protection for S7-1500 controllers, to prevent unauthorized access.
Are you trying to recover a lost password for an older project, or are you looking for ways to secure your own code in TIA Portal? S7 Can Opener - Runmode.com
S7 CanOpener is a third-party utility designed to remove the know_how_protect attribute from SIMATIC S7 program blocks www.runmode.com . While originally developed for the classic STEP 7 v5.x
environment, it is frequently used to unlock older blocks before migrating them to TIA Portal Core Functionality
: Unlocks protected blocks (OB, FC, FB) by modifying the project's offline database files on your hard drive www.runmode.com : Operates on (projects) and (libraries) www.runmode.com Limitations
defeat online CPU passwords or "Block Privacy" introduced in newer STEP 7 versions www.runmode.com Compiled Blocks
: For blocks written in SCL or GRAPH, unlocking only reveals the compiled without comments or variable names www.runmode.com Online Operations
: It does not work online; you must have the project files on your PC www.runmode.com Usage Guide: Unlocking Blocks for TIA Portal
Since TIA Portal often handles protected blocks from older projects as "read-only" or "locked," you must use S7 CanOpener on the original STEP 7 v5.x project files migration. 1. Preparation Ensure you have a backup of your original STEP 7 project. Close STEP 7 and TIA Portal to ensure no files are "in use" Download the utility from a reputable source like 2. Unlocking the Blocks Open the Tool S7CanOpener.exe (no installation is typically required) Locate Project Files
: Navigate to your project folder. The target file is usually found at: [ProjectName]\ombstx\offline\0000000x\subblk.dbf Remove Protection The tool will list all blocks in that folder.
Identify blocks with the protection icon or "Yes" under the protected column. button. The tool will typically create a copy of the original file automatically 3. Migrating to TIA Portal TIA Portal Migrate Project tool and point it to the recently unlocked project file Because the know_how_protect
flag was removed, TIA Portal will now treat these blocks as standard, editable code. Alternative: CANopen in TIA Portal If your query actually refers to using hardware (like the CM CANopen Before we discuss how to open the can,
module) within TIA Portal, the process is official and does not require third-party "openers": CM CANopen module for S7-1200 or an ET 200S 1SI CANopen Configuration Studio
to define the network (PDO/SDO) and then import the configuration into TIA Portal from native TIA Portal blocks or configuring CANopen S7 Can Opener - Runmode.com
This report examines S7 CanOpener, a specialized tool used to manage protected software blocks within Siemens SIMATIC environments, and its relationship with the TIA Portal ecosystem. 1. What is S7 CanOpener?
S7 CanOpener is a third-party utility designed to unlock Siemens PLC program blocks protected with the know_how_protect attribute. It is primarily used when original source code is lost or when a machinery supplier no longer supports their software, leaving system integrators with "read-only" blocks that cannot be troubleshot or modified.
Primary Function: It toggles the protection keyword on-the-fly for program blocks (OB, FC, FB) and User Data Types (UDTs).
Operating Scope: The tool operates strictly on offline project files stored on a hard disk; it cannot remove hardware-level passwords from a live CPU or decrypt online PLC memory.
Code Output: When unlocking compiled blocks (like SCL or GRAPH7), the tool reveals the underlying STL (Statement List) code. It cannot reconstruct the original high-level source files (SCL, CFC) if they were not already present. 2. Compatibility: Step 7 vs. TIA Portal
While S7 CanOpener is historically associated with SIMATIC Manager (Step 7 v5.x), its use in modern TIA Portal environments is restricted by newer security protocols. Classic Step 7 (v5.x) TIA Portal (v11–v19+) S7 CanOpener Support Full support for .s7p projects and .s7l libraries.
Limited. Does not support modern "Block Privacy" encryption. Block Protection Uses the legacy know_how_protect keyword.
Uses advanced asymmetric encryption and hardware-bound passwords. Recovery Path Can be unlocked to reveal STL code.
Requires migration of unlocked v5.x projects into TIA Portal. 3. Integrating Legacy Blocks into TIA Portal
To use blocks that were previously "opened" with S7 CanOpener in a TIA Portal project, users typically follow a migration workflow:
Unlock in Classic: Use S7 CanOpener to remove protection from blocks in the SIMATIC Manager project. An S7 can opener primarily targets Know-How Protection
Verify Code: Ensure the blocks are visible and editable in the classic environment.
Migrate: Use the "Migrate Project" feature in TIA Portal to convert the unlocked .s7p file into a modern TIA project format.
Edit: The migrated blocks (now unlocked) can be modified using TIA Portal's standard editors. 4. Alternative Context: "CANopen" in TIA Portal
Users searching for "S7 Can Opener" may sometimes be looking for CANopen communication modules. Unlike the unlocking tool, these are official hardware solutions for networking:
CM CANopen Module: A plug-in expansion for the S7-1200 PLC that allows connection to CANopen devices (like encoders or drives).
Configuration: These modules are configured directly within the TIA Portal Hardware Catalog using an included "Configuration Studio". S7 Can Opener - Runmode.com
If you need the top performance, commercial tools like Eassiy S7 Unlocker or PLC-Protect Unlocker are the leaders. These are not generic file readers; they are sophisticated reverse-engineering suites.
tconParams.InterfaceId := 64; // Local PN/IE
tconParams.ID := 1; // Unique connection ID
tconParams.ConnectionType := 11; // TCP
tconParams.ActiveEst := true; // Server = false, Client = true
tconParams.RemotePort := 2000;
tconParams.RemoteAddress[1] := 192;
tconParams.RemoteAddress[2] := 168;
tconParams.RemoteAddress[3] := 0;
tconParams.RemoteAddress[4] := 100; // Client IP
tconParams.LocalPort := 2000;
For a server (listen mode): Set ActiveEst := false, RemoteAddress = 0.0.0.0.
In the world of industrial automation, Siemens S7 PLCs (Programmable Logic Controllers) are the gold standard. However, anyone who has worked with TIA Portal (Totally Integrated Automation Portal) knows the frustration of encountering a protected block. Whether it’s a Function Block (FB), Function (FC), or Data Block (DB) locked by Know-How Protection, you’ve hit a wall. You can see the block exists, but its code is a black box.
This is where the concept of the “S7 Can Opener” comes into play. In automation slang, a “can opener” is a software tool or manual method used to bypass or remove S7 block protection, allowing you to view or edit the underlying logic. This article dives deep into the top methods, tools, and ethical considerations for using an S7 can opener specifically within the TIA Portal environment.
Unlike the Classic version where you might drag and drop blocks, the TIA version often requires a specific workflow because TIA Portal stores data differently (inside a SQL-based project database).
Typical Workflow found in the manual: