LOGO! Soft Comfort V8.1 SP1: Upgrading to V8.1.1

Service Pack 1 (SP1) for LOGO! Soft Comfort V8.1 (LSC V8.1) is the official Siemens maintenance release that revises the programming environment to V8.1.1. The package ships as a single executable installer that retrofits an existing V8.1 deployment in place, and also accepts older V1.0 through V7.0 installations as upgrade sources. This reference covers the full SP1 lifecycle: download path, prerequisite checks, the Administrator install, FS04 / FS05 hardware selection handling, post-install version verification, and known compatibility constraints with LOGO! 8 hardware revisions.

Overview of LSC V8.1 SP1

LOGO! Soft Comfort is the FBD / LAD programming environment for the Siemens LOGO! 8 (6ED1052-xxx08-0BA0) logic module family. SP1 is a maintenance release that:

• Raises the LSC product version from 8.1.0 to 8.1.1 (the Help → Info dialog reports 8.1.1).
• Builds against the same setup.exe image architecture as the base V8.1 DVD distribution.
• Is distributed as an upgrade package; it does not require uninstalling V8.1 first when V8.0 or V7.0 is already installed.
• Is digitally signed by Siemens AG and is accepted by Windows 7 SP1, Windows 8.1, and Windows 10 User Account Control when run elevated.

The package consolidates the V8.1 feature baseline (web server editor enhancements, UDF library, message text configurations for LOGO! 8.FS04) and addresses field-reported defects collected between the V8.1 RTM and the SP1 build dated 18 May 2017. The Siemens Service Pack naming convention - raise the minor version, refresh binaries, ship one setup.exe - is shared with sibling products such as SIMATIC CFC V8.1 SP1.

Supported Upgrade Paths

The SP1 setup covers every published LSC version from V1.0 forward:

Prerequisites

Confirm the following before extracting the SP1 download:

1. Administrator privileges on the engineering station. The installer registers COM components, writes to %ProgramFiles%\Siemens\LOGO! Soft Comfort V8.1, and updates the HKLM\SOFTWARE\Siemens\LOGO! Soft Comfort registry hive.
2. Windows 7 SP1 / Windows 8.1 / Windows 10 (x86 or x64). For Windows 7 deployments, install Microsoft's Windows 7 SP1 performance update first; LSC V8.1's background compiler is sensitive to the user-mode scheduler fixes delivered by that patch, and compile times on large FBD diagrams can otherwise extend 2x-3x.
3. .NET Framework 4.0 / 4.5 required by the message-text editor.
4. Minimum 1 GB free disk on the system drive for temporary extraction.
5. A previous LSC installation is mandatory - the SP1 is an upgrade, not a clean install package.
6. LOGO! 8 base module (6ED1052-1xx08-0BA0) for hardware programming, or a third-party LOGO! clone for simulation only.
7. Disable folder-encryption (EFS) on %ProgramFiles%\Siemens; encrypted folders break the COM re-registration step.

Download Procedure

1. Open the Siemens Industry Online Support portal.
2. Navigate to Products & Systems → LOGO! Logic Module → LOGO! Soft Comfort → Demo software, upgrades / updates, drivers.
3. Select the entry titled "Upgrade from LOGO! Soft Comfort: V1.0 / V2.0 / V3.x / V4.0 / V5.0 / V6.x / V7.0 to V8.1 (SP1)".
4. Verify the file size matches the published checksum on the download page.
5. Save the ZIP archive to a local path with at least 1 GB free; do not extract to a network share that requires case-sensitive traversal.
6. Right-click the downloaded ZIP, choose Properties, and click Unblock if SmartScreen flagged it; this prevents the missing-setup.exe symptom after extraction.

Installation Procedure

1. Right-click setup.exe in the extracted folder.
2. Select Run as Administrator. UAC will prompt for elevation; confirm.
3. Choose the installation language. English, German, French, Italian, Spanish, Chinese Simplified, Chinese Traditional, Japanese, and Korean are bundled.
4. Accept the Siemens license agreement. Read the third-party OSS attribution - the LSC V8.1 redistributable includes Qwt, libnodave, and zlib.
5. Select Upgrade when prompted. The installer detects any of V1.0 / V2.0 / V3.x / V4.0 / V5.0 / V6.x / V7.0 / V8.0 / V8.1 and replaces the binaries.
6. Wait for the COM re-registration phase. Do not cancel; the LOGO! Soft Comfort COM service must be re-registered for the OPC.DA and WinCC channel DLLs to load.
7. Reboot is recommended but not mandatory for the programming environment; it is required if the LOGO! CMR2020 Ethernet driver was active during the upgrade.

Silent / Unattended Install

For multi-seat engineering rooms, run the SP1 setup silently:

setup.exe /s /v"/qn REBOOT=ReallySuppress ALLUSERS=1 /L*v \"%TEMP%\SiemensLSC81SP1.log\""

Key MSI properties and values:

Log file path defaults to %TEMP%\SiemensLSC81SP1.log. Validate success with:

findstr /i "Installation completed successfully" %TEMP%\SiemensLSC81SP1.log

FS04 vs FS05 Hardware Selection

The single most frequent field question after installing LSC V8.1 SP1 is the absence of the LOGO! 8.FS05 entry in the hardware catalog. The dialog Tools → Select Hardware → LOGO! 8 lists FS01, FS02, FS03, and FS04 only; FS05 is intentionally not present in the SP1 catalog.

For projects that target a LOGO! 8.FS05 base module (order number suffix -0BA2 production batches from late 2017 forward), the official Siemens workaround is:

1. Open the project in LSC V8.1.1.
2. Select Tools → Select Hardware.
3. Choose LOGO! 8.FS04 in the dropdown even though the physical module is FS05.
4. Confirm the selection. The project compiles and downloads without modification.

Justification: the FS05 revision is a silicon revision of the same FS04 design; the FBD/LAD instruction set, I/O address map, and Ethernet block layout are unchanged. The FS05 designation only marks a manufacturing BOM change for component obsolescence. Selecting FS04 produces a binary that runs on FS05 hardware, and selecting FS05 (once added in a future LSC release) will also run on FS04.

Version Verification

After the installer reports success, verify the actual deployed version with a four-step check:

1. Launch LOGO! Soft Comfort V8.1 from the Start menu.
2. Open Help → Info.
3. Confirm the dialog displays Version 8.1.1 and a build date of 18 May 2017 (or later for localized variants).
4. Check the file properties of %ProgramFiles%\Siemens\LOGO! Soft Comfort V8.1\LSC.exe. The Product version must read 8.1.1.0.
5. From an elevated command prompt: reg query "HKLM\SOFTWARE\Siemens\LOGO! Soft Comfort" /v Version must return 8.1.1.0.

The Info dialog showing 8.1.1 confirms a successful upgrade. Some users report the Info page does not reference "SP1" by name; this is expected - the SP1 marker is internal, and the publicly visible version string is 8.1.1. The audit anchor is the build date 18 May 2017.

Release-Notes Constraints

The LSC V8.1 SP1 release notes do not enumerate every defect fixed. The package must be treated as a Siemens-issued maintenance release; the absence of a per-bug changelog is consistent with other Siemens SP-class updates such as the parallel Service Pack 1 with separate Update 2 for SIMATIC CFC V8.1 (Siemens support entry ID 109475448), which follows the same "raise the version, refresh the binaries" practice. The CFC package upgrades SIMATIC CFC from V8.1, V8.1+SP1, or V8.1+SP1 Update 1 to V8.1+SP1 Update 2, and is staged in maintenance windows the same way.

Troubleshooting Matrix

Rolling Back to V8.1 RTM

If a project that was previously compiled under V8.1.1 fails to download after a hardware change, roll back is supported only via the base V8.1 DVD. There is no SP1 un-install entry. The procedure:

1. Insert the LOGO! Soft Comfort V8.1 DVD.
2. Run setup.exe as Administrator.
3. Select Repair or Reinstall; the installer resets binaries to V8.1.0.
4. Re-apply the SP1 only if the issue is reproducible under 8.1.1.

Related Siemens Update Artifacts

Engineers who manage multiple Siemens packages often schedule SP1 deployments alongside SIMATIC updates. The SIMATIC CFC V8.1 SP1 + Update 2 package (Siemens support entry 109475448) follows the same naming convention and can be staged in the same maintenance window. The two packages do not share binaries; install them in the order your toolchain requires (typically CFC first when S7 CFC blocks are used inside LOGO! UDF libraries).

For the Windows 7 SP1 base OS, install Microsoft's Windows 7 SP1 performance update before LSC V8.1 SP1. LSC's background compiler is multi-threaded and sensitive to the user-mode scheduler changes in that patch; on Windows 7 without it, compile times can extend by a factor of 2x-3x on large FBD diagrams.

FAQ