# Siemens Simit Interface (Pro) {% hint style="warning" %} Please note that this interface is only included in realvirtual Professional {% endhint %} {% hint style="info" %} **New in Version 6.0.4:** This documentation includes new features and improvements coming in realvirtual 6.0.4, including one-click compiler define setup and enhanced SIMIT Unity Coupling V4.0.2 support. {% endhint %} ## Overview The Siemens Simit Unity Coupling Interface provides time-synchronized communication between realvirtual and Siemens SIMIT simulation platform. This interface enables precise coupling of Unity-based virtual commissioning with SIMIT plant models and PLC simulation environments including PLCSIMAdvanced. **Key Features:** * Time-synchronized communication with SIMIT * Automatic signal mapping between realvirtual and SIMIT * Support for Binary, Analog, and Integer signal types * One-click compiler define setup *(New in 6.0.4)* * Enhanced SignalType enum handling *(New in 6.0.4)* * Compatible with PLCSIMAdvanced integration * Real-time bidirectional data exchange ## When to Use This Interface Use the Siemens SIMIT Interface when you need: * **Precise timing synchronization** between Unity and SIMIT simulations * **Coupled simulation** where Unity waits for SIMIT calculation steps * **PLCSIMAdvanced integration** through SIMIT coupling * **Advanced co-simulation** scenarios requiring deterministic timing For standard applications without timing requirements, consider the [SIMIT Shared Memory Interface](/components-and-scripts/interfaces/simit-shared-memory.md) as a lighter alternative. Additional information on the Siemens Simit Interface can be found at this page: {% embed url="" %} Siemens Simit Coupling - Documentation {% endembed %} ## Requirements **Software Requirements:** * Unity 2022.3 LTS or later (Unity 6 recommended) * Siemens SIMIT V11.2 or later * SIMIT Unity Coupling Package V4.0.2 or later * realvirtual Professional license **Hardware Requirements:** * Windows 10/11 (64-bit) * Minimum 8GB RAM (16GB recommended) * DirectX 11 compatible graphics card ## Installation ### Step 1: Obtain SIMIT Unity Coupling Package Download the SIMIT Unity Coupling package from Siemens: * Visit: * Download the latest SIMIT Unity Coupling package * Follow Siemens installation instructions in the manual ### Step 2: Install SIMIT Unity Package 1. Extract the SIMIT Unity package to a local directory 2. In Unity, open **Window → Package Manager** 3. Click **+ → Add package from disk** 4. Navigate to the extracted SIMIT package and select `package.json` 5. Wait for Unity to import the package

Siemens Simit Interface

### Step 3: Setup Compiler Define Symbol The interface requires the compiler define `REALVIRTUAL_SIEMENSSIMIT` to be set. realvirtual 6.0.4 provides an automated setup: 1. Add a **SiemensSimitInterface** component to a GameObject in your scene 2. In the Inspector, click **"Add REALVIRTUAL\_SIEMENSSIMIT Define"** button 3. Unity will automatically add the define and recompile scripts {% hint style="success" %} **New in 6.0.4:** The one-click compiler define setup eliminates manual configuration errors and streamlines the SIMIT interface setup process. {% endhint %}

One-click compiler define setup

{% hint style="info" %} The setup button automatically disappears once the define is properly configured, preventing accidental duplicate defines. {% endhint %} **Alternative Manual Setup:** If needed, you can manually add the define in **Project Settings → Player → Scripting Define Symbols**: * Add: `REALVIRTUAL_SIEMENSSIMIT` ## Configuration ### Adding the Interface to Your Scene 1. **Create Interface GameObject:** * Add an empty GameObject to your scene * Add **SiemensSimitInterface** component * The **realvirtualCoupler** component is added automatically 2. **Add SIMIT Connection:** * Drag the **SimitConnection** prefab from the SIMIT Unity package into your scene * Reference it in the **Simit Connection** field of the SiemensSimitInterface

Complete SIMIT interface setup in Unity

### Signal Configuration **Step 1: Add realvirtual Signals** 1. Add all realvirtual signal components as children of the SiemensSimitInterface GameObject 2. Supported signal types: * **PLCInputBool/PLCOutputBool** → SIMIT Binary signals * **PLCInputFloat/PLCOutputFloat** → SIMIT Analog signals * **PLCInputInt/PLCOutputInt** → SIMIT Integer signals **Step 2: Update Signal Mapping** 1. Click **"Update Simit Signals"** button in the SiemensSimitInterface component 2. This automatically maps all child signals for SIMIT coupling 3. The interface handles signal type conversion automatically **Step 3: Import Signals in SIMIT** 1. In your SIMIT project, use **Unity Coupling → Update Signals** 2. All signals appear in SIMIT with the naming convention: ``` [SimitInterfaceName].realvirtualCoupler.[SignalName] ```

Scene with SIMIT interface and signals

Signals imported in SIMIT

## Properties **Siemens Simit Interface (Script)** * **Active** (Always/Never) - Interface activation mode * **Simit Connection** (GameObject) - Reference to SimitConnection prefab * **Debug Mode** (boolean) - Enable debug logging **Realvirtual Coupler (Script)** * **Signals** (Signal\[]) - Auto-populated array of mapped signals (read-only) ## Troubleshooting **Common Issues:** 1. **"SIMIT types not found" compilation errors** * Ensure SIMIT Unity package is properly installed * Verify `REALVIRTUAL_SIEMENSSIMIT` define is set * Use the automated setup button in the interface 2. **No signals appear in SIMIT** * Check that signals are children of SiemensSimitInterface * Click "Update Simit Signals" button * Verify SimitConnection is referenced and active 3. **Interface not connecting** * Ensure SimitConnection prefab is in the scene * Check SIMIT Unity Coupling settings in SIMIT * Verify network connectivity if using remote SIMIT {% hint style="warning" %} Always ensure the SIMIT Unity Coupling package is properly installed before using this interface. Missing SIMIT components will cause compilation errors. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://doc.realvirtual.io/components-and-scripts/interfaces/siemens-simit-interface-pro.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.