Troubleshooting Empty SIMIT Component Libraries and Component Type Editor (CTE) Password Prompts

In Siemens SIMIT Simulation Platform, discovering an empty component library in the Task Card or encountering a password prompt when attempting to open a component in the Component Type Editor (CTE) is caused by active Know-how Protection or missing add-on licenses. Siemens behavioral libraries (such as the SIMIT Drives Behavioral Library) and third-party vendor components are encrypted by their authors to safeguard intellectual property; opening them in CTE strictly requires the author's password. If the library appears completely empty in the main SIMIT interface, verify that the library folder contains valid *.simcat files and ensure that required licenses (such as SIMIT FLOWNET or CONTEC) are active in Automation License Manager. Validate license requirements with an authorized Siemens distributor or the Siemens Industry Mall.

Executive Summary

Simulation engineers working with SIMIT V10 / V11 frequently import specialized behavioral libraries—such as SINAMICS drive models, conveyor components, or custom process unit operations—only to find the library folders empty in the SIMIT Components task card, or receive an unexpected password dialog when trying to inspect block behavior in the SIMIT Component Type Editor (CTE). This behavior stems from two independent mechanisms: proprietary Know-how Protection applied to component source code and licensing restrictions on specialized simulation domains. This guide clarifies the role of Know-how protection in SIMIT CTE and provides troubleshooting workflows for empty library catalogs.

Architecture and Fundamental Mechanics

The SIMIT component architecture balances user extensibility with intellectual property security:
1. SIMIT Component Model Architecture:
SIMIT models are packaged into component libraries containing compiled binary definitions, graphical symbol representations, and behavioral connection points (.simcat catalog files and .scl source files).
2. Know-how Protection in Component Type Editor (CTE):
SIMIT CTE allows developers to write custom mathematical and logical behavioral models using the SIMIT Component Description Language. To protect proprietary control algorithms or OEM equipment models, developers apply Know-how Protection (password encryption). Once protected, end users can freely instantiate and simulate the block in SIMIT diagrams, but attempting to view or edit the underlying code in CTE triggers a password challenge. Without the developer's password, the source code cannot be decrypted.
3. Library Catalog Loading and License Filtering:
When SIMIT launches, it scans configured global and project library directories. If a library depends on specialized physical simulation solvers (such as SIMIT FLOWNET for thermodynamic piping networks or SIMIT CONTEC for material handling) and the corresponding engineering license is missing from Automation License Manager, SIMIT suppresses the components from the palette, rendering the folder empty.

Step-by-Step Implementation Procedure

Verify Component Library File Structure on Disk:
a. Open Windows File Explorer and navigate to the directory where the library was unzipped or installed.
b. Verify that the folder contains valid .simcat (catalog) files and associated subfolders.
c. Ensure that files were not corrupted during unzipping or blocked by Windows Defender SmartScreen.
Open the Library Properly in SIMIT:
a. Open SIMIT and open your simulation project.
b. In the right-hand task card, expand 'Components'.
c. Under 'Global components' or 'Project components', click 'Open library...'.
d. Browse to the extracted library folder and select the catalog file.
e. Verify whether components now appear in the catalog tree.
Check SIMIT Licensing in Automation License Manager:
a. Open Automation License Manager.
b. Check the installed SIMIT licenses: verify whether you have SIMIT Standard, SIMIT Professional, or SIMIT Ultimate.
c. Check for required add-on licenses such as 'SIMIT FLOWNET' or 'SIMIT CONTEC' if using fluidic or conveyor libraries.
Handling the CTE Password Challenge:
a. Understand that SIMIT CTE is designed for creating and modifying custom components, not for running simulations.
b. To use a pre-built drive or valve library, you do not need to open it in CTE: simply drag and drop the component from the 'Components' task card directly onto your SIMIT simulation diagram sheet.
c. If you must modify internal component logic, you must contact the library author or equipment OEM to obtain the authorized Know-how protection password.

Verification

In SIMIT, drag a component from the library palette onto a simulation diagram sheet: confirm that the component drops successfully and displays all input/output connectors.
Start SIMIT simulation in Test Mode: confirm that the component executes its behavioral formulas and communicates with the SIMIT Virtual Controller without licensing errors.
In SIMIT project properties, verify that the library path shows a green status indicator.

Limitations and Operational Precautions

Siemens Technical Support cannot bypass, recover, or crack forgotten Know-how protection passwords on SIMIT CTE components. Protection is cryptographically enforced to safeguard third-party proprietary designs.

Engineer FAQ

Why does SIMIT CTE ask for a password when opening a component?

The component was encrypted with Know-how Protection by its author to protect proprietary algorithms. You cannot edit the source without the author's password.

Do I need a password to use the component in a simulation diagram?

No. Password protection only restricts viewing and editing source code in CTE. Protected components can be instantiated and simulated freely on diagram sheets.

Why does an imported library appear empty in SIMIT?

Common causes include corrupted unzipping, missing .simcat files, incorrect folder selection when opening the library, or missing add-on licenses (e.g., FLOWNET or CONTEC).