Installing STEP 7 Professional 2006 SR3/SR4 on Windows Vista

Overview

STEP 7 Professional 2006 is the SIMATIC engineering environment used to configure, program, and commission SIMATIC S7-300, S7-400, ET 200S/ET 200M, and C7 controllers. The base release (V5.4) shipped before Microsoft Windows Vista was released and was not aware of the new security and runtime model that Vista introduced (User Account Control, Windows Installer 4.5, Side-by-Side Win32 assemblies, and stricter manifest signing). On Vista the original setup exits with the message "This version is not compatible with Windows Vista." and refuses to install any components.

Siemens addressed this by publishing a full install image of V5.4 SP3 and a follow-on patch named Service Release 3 (SR3) plus a final Service Release 4 (SR4). The official rule is: STEP 7 V5.4 SP3 is the only install that supports Vista, and STEP 7 Professional 2006 SR3 or SR4 must be applied on top of it to reach a Vista-certified state. This article walks through the verified install path, the Set PG/PC Interface configuration, and the verification steps that confirm a working install.

Vista Compatibility Matrix for STEP 7 Professional 2006

Reference: STEP 7 Professional 2006 - Service Release 4 - Siemens Support explicitly states: "If you wish to change to MS Windows Vista with STEP 7 Professional, you require STEP 7 Professional 2006 SR3 or SR4."

Prerequisites

Confirm the following before running setup. The Vista-specific requirements are non-negotiable because the STEP 7 installer will silently roll back if any of them are missing.

• Operating system: Windows Vista Business, Enterprise, or Ultimate, 32-bit (x86). Home Basic and Home Premium are listed in the readme as "not tested"; install on Business/Enterprise/Ultimate is recommended.
• Service Pack: Windows Vista SP1 minimum, SP2 strongly recommended. SP1 fixes the MSI 4.5 transaction issues that corrupt the C:\Program Files\Siemens\Automation tree on the first install attempt.
• Administrator account: The user account must be a member of the local Administrators group. UAC must be disabled for the duration of the install (re-enable after reboot).
• UAC setting: Control Panel → User Accounts → Turn User Account Control on or off → uncheck the box. Reboot.
• Anti-virus / firewall: Pause real-time scanning. Some suites (Symantec Endpoint Protection 11.x, McAfee VirusScan 8.7i) flag the S7EPARS.DLL hook installer as suspicious and quarantine it.
• Free disk space: 4 GB on C:\ for the full install including S7-PLCSIM, S7-Technology, and the documentation set.
• Source media: STEP 7 V5.4 SP3 DVD (full install) plus the STEP 7 Professional 2006 SR4 download package, or the combined SR4 media set.
• .NET and Windows Installer: .NET Framework 3.0 is required for the S7 Help system and for the Automation License Manager; .NET 2.0 SP1 is required by the SIMATIC Manager shell.
• Logins: Local Administrator; do not install from a domain account with mandatory roaming profile, as the installer's per-user HKCU writes fail in that case.

Install Order and Patch Sequence

The correct sequence is mandatory; deviating from it leaves the install in an undefined state that the SIMATIC Manager will silently detect as broken at first launch.

1. Boot Vista, log in as local Administrator, and confirm UAC is off.
2. Insert the STEP 7 V5.4 SP3 DVD. If Autorun does not fire, run D:\Setup.exe manually.
3. Choose Install STEP 7. The installer writes the base V5.4 SP3 files to %ProgramFiles%\Siemens\Automation and registers the COM objects used by the SIMATIC Manager.
4. Reboot when prompted. Do not skip this reboot; the S7EPARS service is registered at this point and will not start until the system restarts.
5. Apply STEP 7 Professional 2006 SR3 or SR4. The SR is shipped as a self-extracting archive (..._SR4.exe) that wraps an MSI. Run it with elevated privileges (right-click → Run as administrator) and select Upgrade when prompted.
6. Reboot again. The S7ONLINE access point and the Automation License Manager service are re-registered with the SR manifest.
7. Re-enable UAC if desired.

Installing Optional Add-ons

The Professional 2006 suite contains the components below. Each is a separate MSI and may be installed in any order after the base V5.4 SP3 + SR4 sequence completes.

PG/PC Interface Configuration

The Set PG/PC Interface tool (SET_PGPC.EXE in %ProgramFiles%\Siemens\Automation\Simatic_manager) is the central configuration point for any communication the SIMATIC Manager performs. On Vista this tool must be run elevated, otherwise writes to HKLM\SOFTWARE\Siemens\S7ONLINE silently fail and the access point is left pointing at a non-existent interface.

1. Start → SIMATIC → STEP 7 → Set PG/PC Interface.
2. Right-click the launcher, choose Run as administrator, and confirm the UAC prompt.
3. In the Access Point of the Application dropdown, select S7ONLINE (STEP 7) → PG/PC for the standard programming interface.
4. In the Interface Parameter Assignment Used list, pick the appropriate interface for your hardware:

5. Click Properties... to open the parameter dialog.
6. For MPI/PROFIBUS, set Address = 0 (the programming device address) and Transmission Rate to match the bus scan. 187.5 kbps is the universal default that all S7 CPUs support.
7. For TCP/IP → ISO, set the local IP of the PG's Ethernet adapter and confirm that the CP is on the same subnet.
8. Click OK, then Diagnostics... to run the PG/PC diagnostic. The diagnostic must report a green status for the active interface.

Communication Setup Walkthrough

Once the access point is configured, the SIMATIC Manager will use it transparently. The procedure below confirms each path end-to-end.

TCP/IP to S7-300 with CP343-1

1. Set the CP343-1 to a fixed IP in the same subnet as the PG, with subnet mask 255.255.255.0 and no router. Confirm with the SIMATIC Manager's Accessible Nodes (PLC → Accessible Nodes).
2. In Set PG/PC Interface, point S7ONLINE at TCP/IP → <your NIC>.
3. From SIMATIC Manager choose PLC → Download, or use Accessible Nodes to read the rack online.

MPI to S7-300/400

1. Plug the PC Adapter (6ES7972-0CA23-0XA0 or USB variant 6GK1571-0BA00) into the MPI port of the CPU.
2. Confirm the MPI LED on the PC Adapter is steady green (187.5 kbps negotiated).
3. In Set PG/PC Interface, set S7ONLINE to MPI → PC Adapter (MPI). Properties: PG address 0, transmission rate 187.5 kbps, highest station address 31.
4. Accessible Nodes should return the CPU's MPI address (default 2).

PROFIBUS DP to ET 200S

1. Set the ET 200S PROFIBUS address with the DIL switch on the IM151-1.
2. PC Adapter DIP switch 1-7 = PROFIBUS, switch 8 sets the termination (on if it is the end node).
3. In Set PG/PC Interface, point S7ONLINE at PROFIBUS → PC Adapter (PROFIBUS). Properties: PG address 0, 1.5 Mbps standard, profile DP.
4. Run Accessible Nodes; the ET 200S IM should appear with its configured address.

Verification Procedure

After install and configuration, perform the checks below in order. Each step is a hard pass/fail gate that confirms the previous layer of the stack.

1. SIMATIC Manager launches. Start → SIMATIC → STEP 7 → SIMATIC Manager. No "missing DLL" dialog, no activation-prompt for an invalid license.
2. Automation License Manager shows the local license. Start → SIMATIC → Automation License Manager. The local disk should display the STEP 7 Professional 2006 license tag.
3. Set PG/PC Interface diagnostic returns green. Open it, click Diagnostics..., then Test. The dialog must display "OK" for the active interface and report the interface name and address.
4. Accessible Nodes enumerates the target CPU. PLC → Accessible Nodes. A live CPU on MPI/TCP/PROFIBUS must appear within 5 seconds.
5. Online project download succeeds. Open any project, right-click the S7 program, choose Download. The dialog reports a successful transfer without an "Internal error" popup.
6. Online block view works. Right-click an FB or DB and choose Monitor/Modify. The actual values from the CPU appear within one cycle.

Troubleshooting Matrix

Known Issues and Workarounds

Issue: S7EPARS service fails to start

The S7EPARS service is registered by V5.4 SP3 and re-registered by SR4. On Vista, the service may start in a "stopped" state if the install was performed from a non-elevated shell. Open services.msc, right-click SIMATIC S7EPARS, choose Properties, set Startup type = Automatic, and click Start. If the start fails with Error 1053, reinstall V5.4 SP3 fully and confirm that %ProgramFiles%\Siemens\Automation\s7pars\s7epars.exe exists.

Issue: Online Help (CHM) does not open

Vista blocks CHM files opened from a network share. The STEP 7 help is stored in %ProgramFiles%\Siemens\Automation\Help. If it is mapped from a server, copy the help folder locally and add a registry entry under HKLM\SOFTWARE\Microsoft\HTMLHelp to allow local-only execution.

Issue: COM port locks on PC Adapter (serial variant)

For the legacy serial PC Adapter (6ES7972-0CA23-0XA0), Vista's COM port enumerator reserves COM10+ for Bluetooth stacks. Force the PC Adapter to a low COM number with the device manager's Advanced settings, then pick that COM port in the Set PG/PC Interface parameter dialog.

Issue: 64-bit Vista

STEP 7 Professional 2006 SR4 is 32-bit only. On x64 Vista, the install writes to C:\Program Files (x86)\Siemens\Automation. The S7EPARS service runs under WOW64; this is supported, but mixed-mode debugging with a 64-bit PLC Scout will fail. Use a 32-bit Vista install if the engineering environment must be homogeneous.

Firmware and Driver Notes

The PC Adapter USB A2 driver shipped with SR4 is V2.4. It supports the following Siemens PC Adapter P/Ns:

• 6GK1571-0BA00-0AA0 (USB, MPI/DP, 12 Mbps USB)
• 6ES7972-0CB20-0XA0 (USB, MPI/DP, successor)
• 6ES7972-0CA23-0XA0 (serial, legacy, still supported)

The PC Adapter firmware is not user-upgradable from the Vista host; firmware updates require a Siemens Field PG with the original PROM programmer utility. Drivers below V2.2 are not Vista-aware and will produce a yellow bang in Device Manager with code Code 39 (driver cannot load).

Migration Considerations

STEP 7 Professional 2006 projects remain compatible with all later versions of STEP 7 V5.x and with TIA Portal's "STEP 7 V5 project" importer. To move an SR4-on-Vista project to a Windows 7/10/11 host running TIA Portal V13 SP1 or later:

1. Archive the project as a .s7p file from the SIMATIC Manager on the Vista host.
2. Copy the archive to the new host.
3. In TIA Portal choose Project → Retrieve and select the .s7p archive. The importer rebuilds the S7 program blocks, the hardware configuration, and the symbolic table.
4. Recompile any SCL sources - SCL V5.3 SP3 is forward-compatible with TIA Portal SCL/PLCSIM, but variable scoping rules tightened in TIA Portal V14 and may require manual review.

Projects created in TIA Portal cannot be opened in STEP 7 Professional 2006. Plan the migration direction accordingly.

Verification Checklist (Print-Friendly)

• [ ] Operating system confirmed: Vista Business/Enterprise/Ultimate, 32-bit, SP1+
• [ ] Local Administrator login, UAC disabled during install
• [ ] STEP 7 V5.4 SP3 DVD installs without error
• [ ] STEP 7 Professional 2006 SR4 (or SR3) installs over V5.4 SP3
• [ ] Two reboots performed as prompted
• [ ] SIMATIC Manager launches
• [ ] Automation License Manager shows the Professional license
• [ ] Set PG/PC Interface is elevated and diagnostic is green
• [ ] Accessible Nodes enumerates the target CPU on the chosen bus
• [ ] Online block download succeeds

FAQ