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Entry type: FAQ Entry ID: 50204569, Entry date: 06/22/2018

What are the requirements for installing STEP 7 (TIA Portal) V15.1?

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The information and links below give you an overview of the general requirements for installing STEP 7 (TIA Portal).

1. General

The requirements for installing STEP 7 (TIA Portal) V15.1 are available in the Product Information and in the manual:

2. Installation of STEP 7 (TIA Portal) V15.1 in parallel to other versions of STEP 7

You can also install other versions of STEP 7 on your computer in parallel to STEP 7 (TIA Portal) V15.1:

  • STEP 7 (TIA Portal) V11 up to V15 

  • STEP 7 V5.4 or higher

  • STEP 7 Professional 2017 

  • STEP 7 Micro/WIN V4.0 SP9

The license procured for STEP 7 (TIA Portal) V15.1 is valid for all the previous versions of STEP 7 (TIA Portal).

There is no release for the parallel operation online of STEP 7 V5.x and STEP 7 (TIA Portal).

It is not permitted to install WinCC V15.1 in parallel to versions WinCC previous to WinCC V7.0 SP2. It is also not permitted to install WinCC V15.1 in parallel to WinCC V7.0 SP2 or WinCC V7.0 SP3 for:

  • WinCC V15.1 Professional
  • WinCC V15.1 Runtime Professional

Note on WinCC and WinCC flexible

  • You can install WinCC flexible and WinCC (TIA Portal) at the same time on one and the same computer.

  • You cannot install WinCC and WinCC (TIA Portal) at the same time on one and the same computer.

3. Opening projects from earlier versions of STEP 7 (TIA Portal)

In TIA Portal V15.1 the STEP 7 Professional / Basic project is automatically upgraded to V15.1 when opened if you have created the project with TIA Portal V13 SP1 (or higher). Projects from earlier versions of TIA Portal first have to be stored and compiled in one of those versions. More information is available in Entry ID: 109476392.

4. Compatibility with projects from STEP 7 V5.4 and V5.5

Using the "Project > Migrate Project..." function in STEP 7 (TIA Portal) V15.1 you can migrate projects created with STEP 7 V5.5 and higher or STEP 7 Professional 2010 and higher to STEP 7 (TIA Portal) V15.1. The STEP 7 projects that contain a configuration with WinCC or WinCC flexible can also be migrated to the TIA Portal V15.1 with the included WinCC flexible parts. Included configurations created with WinCC V7.0+SP2 or lower are currently not migrated as well. The following components must be installed on your computer for this:

  • STEP 7 V5.5 and higher

  • WinCC V7.0+SP2 and higher or WinCC flexible 2008+SP2 and higher

More information is available in the manual of STEP 7 (TIA Portal) under Migrate Projects and Programs.

You cannot migrate WinCC V7.0+SP1 or lower.

5. Repair of STEP 7 (TIA Portal) V15 software

If the installation of STEP 7 (TIA Portal) V15 is defective or has been damaged by an event, you have the option of repairing the software.

  1. Insert the STEP 7 (TIA Portal) V15 CD in your computer's CD drive.

  2. If the Setup program does not start automatically, open the "Start.exe" file.

  3. Select the language in which you want the dialogs displayed.

  4. Select the "Repair" option field and click the "Next >" button.

  5. Follow the instructions on the screen.

6. Uninstallation of STEP 7 (TIA Portal) V15

You can uninstall STEP 7 (TIA Portal) V15 in two ways:

  • Uninstallation via the Control Panel (in Windows 7)
  • Uninstallation using the SIMATIC STEP 7 (TIA Portal) V15 CD

The uninstallation instructions are in the manual under Start Uninstallation.

Further information about completely uninstalling STEP 7 (TIA Portal) is available in Entry ID: 76325723.

7. Uninstallation of WinCC (TIA Portal) Professional

If installation of STEP 7 (TIA Portal) aborts and you receive the message that you must uninstall an earlier version of WinCC Professional beforehand even though you have already done the uninstallation, this might be due to a Registry code. Proceed as follows to remove the Registry entry in Windows 7, for example:

  1. In Windows 7 you open the Registry by going to "Search programs and files" and entering "Regedit" and confirm with Enter.

  2. Open the path:


Remove the item "4_0_Professional". Do a restart and then you can install STEP 7 (TIA Portal) V15.

Fig. 01

This entry contains information about editing the Registry. You should make a backup copy of the Registry before editing it. More information on making a backup copy, restoring and editing the registry is available in the Microsoft Knowledge Base in Entry ID 256986. Incorrect use of the Registry editor can cause serious problems that affect the complete system and require a reinstallation. You use the Registry editor at your own risk.

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In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
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