Reinstall LOGO! Soft Comfort: Recover the Engineering Software After a Computer Change

Siemens LOGO! Soft Comfort is the engineering software for the LOGO! logic module family. Unlike TIA Portal, STEP 7, or S7-PLCSIM, the LOGO! engineering tool does not use a centralized license key server, an electronic license (eLicense) file, or a Software Protection Key (USB dongle). The right to use the software is bound to a physical installation on a PC, originally established by a CD or DVD that was purchased from Siemens or a Siemens distributor. When a computer is replaced, lost, or re-imaged, the engineering environment is not recovered by entering a serial number; it is recovered by reinstalling from the original media or by ordering a replacement DVD. This article documents the exact recovery procedure, the upgrade path, and the verification checks required to bring a new PC back to a working LOGO! Soft Comfort environment.

1. The LOGO! Soft Comfort Licensing Model

Siemens' general automation software portfolio uses a floating or node-locked license key system managed by the Automation License Manager (ALM). LOGO! Soft Comfort is an intentional exception in this portfolio, kept simple for the small-machine and building-services audience it targets.

The practical consequence: if you have only a single CD from years ago and that CD is unreadable, lost, or in a different country, you cannot independently create a working LSC environment on a fresh laptop. You must obtain the original media again. The remainder of this article shows the three legally supported paths to do that.

2. Prerequisites for Recovery

Before choosing a recovery path, verify the following on the machine that needs LSC:

1. Operating system: LOGO! Soft Comfort V9 supports Windows 10 (64-bit, version 1809 or later) and Windows 11. Earlier versions of LSC (V7, V8) supported Windows 7 and Windows 8.1 — confirm what the new PC can run before ordering media.
2. Administrator rights: The install requires local administrator privileges, including the right to install and start services such as the LOGO! Access Tool.
3. Optical drive or virtual drive: For DVD-based install, the new PC needs either a working DVD drive or the ability to mount an ISO image. Most modern field laptops lack an optical drive, so a USB DVD drive or a virtual mount (e.g. the Windows built-in ISO mount) is required.
4. Existing LSC project files: Locate the original .lsc (LOGO! Soft Comfort V6 / V7), .lsc2 (LOGO! 8 and later), or .lld (LOGO! Logic Diagram) project files. These survive PC changes; only the editor needs to be reinstalled.
5. Siemens Industry Online Support (SIOS) account: Required to download any available upgrade packages. Registration is free at the Siemens support portal.

3. Option A — Order a Replacement DVD from Siemens

This is the cleanest path for engineers working away from their home office. Siemens sells replacement LOGO! Soft Comfort media through its standard distribution channels.

1. Identify the article number. The LOGO! Soft Comfort DVD is sold under the Siemens article number 6ED1058-0BA02-0YA8 (LSC DVD) for the V8.x family, with V9.x sold via its own successor article. Always confirm the current article number with your local Siemens distributor before placing the order.
2. Contact a Siemens distributor in the country where you are currently working. Every Siemens regional office can ship media internationally; typical delivery is 3–7 business days inside the EU and 5–14 days outside the EU, depending on courier option.
3. Order a printed invoice with the order. The invoice acts as your proof of license in any future audit or for transfer to a new employer.
4. When the DVD arrives, store it in a protective sleeve and image it (.iso file) to a network share so a third recovery never has to depend on a single physical disc.

4. Option B — Use a Colleague's Original DVD

For engineers embedded in a maintenance team, the DVD does not need to be the engineer's own. Any valid LOGO! Soft Comfort CD or DVD from any PC in the organisation can be used to install the full software on a different machine. The license is tied to the existence of a valid LSC media purchase, not to a specific person.

1. Have a colleague image their original LOGO! Soft Comfort DVD to an .iso file. Use any standard imaging tool (e.g. ImgBurn, the Windows 10/11 built-in recorder, or dd on Linux).
2. Mount the ISO on the new PC (right-click → Mount in Windows Explorer).
3. Run Setup.exe from the mounted volume with administrator rights.
4. Keep the ISO on a shared engineering share for the duration of the project; do not modify or copy the original disc.

5. Option C — Download an Upgrade from SIOS

If a full version of LSC is already installed on a PC that you can reach (e.g. a home workstation, a colleague's laptop, or a virtual machine in your company's data center), the upgrade path is the fastest route to a working install on the new PC.

1. Open the Siemens Industry Online Support portal and search for "LOGO! Soft Comfort" in the downloads area. The latest published version is V9.0 (and any subsequent service packs). The article that lists the current download is reachable from the product page at LOGO! Software – Simple Engineering for LOGO!.
2. Download the upgrade executable. This is a self-extracting installer, typically named LogoSoftComfort_V9_x_x_x_x.exe.
3. On the new PC, run the upgrade installer. The installer will detect whether a previous version of LSC is already installed. If it is, the upgrade proceeds in place.
4. If no prior LSC exists on the new PC, the upgrade installer will request that an LSC CD or DVD be inserted in a drive. Mount the original ISO (from Option A or Option B) in a virtual drive at this point and click Retry. The install then completes as a full V9 install.
5. Reboot the PC when prompted. The installer registers the LOGO! Access Tool service for Ethernet communication with LOGO! 8 / LOGO! 8.3 hardware.

6. Step-by-Step Installation Procedure (Reference Flow)

Use this flow as a checklist regardless of which of the three recovery options above you chose.

1. Pre-install verification. Confirm Windows version, free disk space (minimum 1 GB recommended, 3 GB preferred for V9 with project archives), and the presence of an admin account.
2. Insert or mount the original media. Either physical DVD in a USB DVD drive, or the .iso mounted as a virtual drive letter.
3. Launch the installer. Browse to the mounted volume and double-click Setup.exe. If User Account Control prompts, accept with admin credentials.
4. Accept the license agreement. The license text is the standard Siemens Automation License Terms. Read and accept.
5. Select destination. Default path is C:\Program Files\Siemens\LOGO Soft Comfort V9. Use the default unless corporate standards dictate otherwise.
6. Select components. Typical selection: LOGO! Soft Comfort Editor, LOGO! Access Tool, and LOGO! Web Editor (the latter is included with V9 for direct browser-based visualization of the connected LOGO! 8.3 BM).
7. Install. Progress typically takes 2–5 minutes on a modern laptop.
8. Finish and reboot. Some versions require a reboot to register the LOGO! Access Tool Windows service used for Ethernet communication.
9. First launch. Start LSC. If the install was a clean media install, the software launches in the language matching the OS. Switch language via Extras → Options → General → Language if needed.

7. Restoring Existing LOGO! Projects

The project files are not coupled to the PC install. They live on disk and can be carried on a USB stick, a cloud share, or in a version control system. After reinstall, restore the project files to a working folder and open the file in the new editor.

When LSC opens a project from an older LSC version, it offers a one-way conversion. Always save the converted project with a new name (e.g. PumpControl_v9.lsc2) to keep the original-version file as a fallback. There is no reliable reverse path from a converted project back to an older editor.

8. Connecting to the LOGO! Module

After the editor is installed, verify PC-to-LOGO! communication before trusting the recovery:

1. Connect the LOGO! 8 or LOGO! 8.3 BM to the PC with a standard Ethernet patch cable. LOGO! 8 introduced an integrated Ethernet port; no special cable is required.
2. Open Tools → Transfer → PC ↔ LOGO! (or click the Ethernet icon in the toolbar).
3. Set the PC's Ethernet interface to a static address on the same subnet as the LOGO!. Default LOGO! IP is 192.168.0.100 with subnet 255.255.255.0. Set the PC to 192.168.0.10 / 255.255.255.0.
4. Click Online. The editor should report the connected LOGO! hardware, the firmware version, and the project name currently loaded in the module.
5. Use Upload from LOGO! → PC to retrieve the live project as a safety backup before making changes.

9. Verification Checklist After Reinstall

Run through the following checks before declaring the recovery complete:

10. Troubleshooting Matrix

11. Field-Proven Practices for Avoiding This Situation

• Image the original DVD on receipt. Create an .iso file the first day the DVD arrives and store it in two independent places (cloud + NAS). The DVD itself is media that degrades; the ISO is data.
• Keep a virtual machine with LSC preinstalled. A 40 GB Windows VM with LSC V8.3 + V9 and the original .iso mounted once can be copied to a new laptop in minutes — the upgrade chain is preserved.
• Centralise projects in source control. Git, SVN, or even a shared folder with daily snapshots, ensures that a lost PC does not mean a lost program. The editor is recoverable; the customer-specific logic often is not.
• Document the LOGO! firmware version on the project. Place a comment block at the top of every diagram noting the target LOGO! hardware and the LSC version used to author it. This avoids compatibility surprises when a different team member opens the project.
• Carry a USB DVD drive on long assignments. When working abroad, a $25 external DVD drive is the difference between one business day of downtime and two weeks of shipping.

12. Notes on Web-Based and Cloud Tools

Siemens publishes a set of browser-based helpers around the LOGO! family. These are not substitutes for LOGO! Soft Comfort but are useful when the editor is unavailable.

• LOGO! Web Editor (V9): A small editor integrated into the LOGO! 8.3 BM that lets the engineer change logic from any browser pointed at the module's IP. Useful for on-site emergency edits when LSC is not available, but limited to small diagrams.
• LOGO! Access Tool: A Windows service that exposes LOGO! 8.3 variables to OPC UA / MQTT / HTTP clients. It is installed with LSC V9 and is the path to integrating LOGO! into higher-level SCADA systems.
• LOGO! Web pages (custom): Built inside LSC V9 using the Web Editor; the resulting .bin user pages are stored on the LOGO! 8.3 BM and served at http://<LOGO_IP>/.

The full Siemens product overview and the link to the latest LSC V9 download are maintained on the official LOGO! Software – Simple Engineering for LOGO! page. The bundled LSC Online Help PDF — the same content as the in-application Help → Contents — is the definitive reference for every menu and dialog and can be downloaded separately as LOGO! Soft Comfort Online Help (PDF).

13. Frequently Asked Questions