TIA Portal Tutorial: Using S7-PLCSIM to Simulate Your Project

Introduction

When working with Siemens automation projects in the TIA Portal, it’s not always necessary to have a physical PLC on hand. Thanks to S7-PLCSIM, Siemens’ virtual PLC simulator, you can fully test your logic, monitor tags, and validate system behavior before deploying to actual hardware. This guide walks you through the steps to simulate your project using S7-PLCSIM, from setup to going online with your virtual CPU.

Step-by-Step Guide to Simulating Your Project in TIA Portal with S7-PLCSIM:

Install S7-PLCSIM on your computer

Before starting, make sure that S7-PLCSIM is installed. This is a separate Siemens software package that allows you to simulate an S7-1200 or S7-1500 CPU.

Open your TIA Portal project
- Launch TIA Portal and open the project you want to simulate.
Click the Simulation button
- In the toolbar, click the simulation icon (it usually looks like a small CPU or has the label “Start Simulation”). This will open the PLCSIM environment.
Download configuration window appears
- Once simulation is activated, the download dialog will open. In the PG/PC Interface section, make sure that “PLCSIM” is selected (it should be the default when PLCSIM is running).
The software will search for available CPUs
- TIA Portal will scan and detect the virtual CPU, often using a default IP like 192.168.25.1.
Certification warning may appear
- If prompted with a message about associated certification, simply click Connect to proceed.
Click “Load” to download the program
- Once the virtual CPU is detected, click the Load button to transfer your project to PLCSIM.
Start the CPU module
- After loading, either click Start Module directly from the download window or start the CPU manually from within the PLCSIM interface.

Final Step: Go Online

After the download and startup are complete, you can go online with the simulated CPU just like you would with a real one. This allows you to monitor variables, force inputs/outputs, and test your logic in a fully virtual environment.