How PCS 7 V9.0 SP3 UC04 Resolved a WinCC TagLoggingServer Restart

In one PCS 7 V9.0 SP3 system, redundant OS servers restarted after WinCC reported TLGRT Exception from Machine.Software.WinCC.TagLoggingServer. The system owner reported that Siemens Support identified Update Collection 04 (UC04) as the correction; UC04 includes a newer WinCC update than UC03. Siemens' public Readme confirms the component-version change but does not name this exact exception as a fixed defect, so treat the outcome as specific to the reported case.

Reported Symptom and Resolution

After upgrading from PCS 7 V9.0 SP1 to V9.0 SP3 UC03, the reported redundant OS server repeatedly restarted following the WinCC self-diagnosis message Value TLGRT Exception from participant Machine.Software.WinCC.TagLoggingServer is invalid. In this case, Siemens Support identified PCS 7 V9.0 SP3 UC04 as the correction; the follow-up reports that its included WinCC update resolved the problem. Treat this as a version-specific, support-reported resolution, not a guarantee that UC04 fixes every OS restart or every TagLoggingServer exception.

Confirm the Affected Version

Check that the affected system is specifically PCS 7 V9.0 SP3 UC03 and identify the installed WinCC component update on the affected OS stations. Siemens' PCS 7 V9.0 SP3 UC06 Readme states that UC04 replaces UC03 and incorporates its corrections; the component table lists WinCC V7.4 SP1 Update 19 for UC04, compared with Update 18 for UC03. The Readme does not name the TLGRT exception as a specific corrected defect; that attribution comes from the support resolution reported in this case.

Applying the Reported Correction

Record the PCS 7 and WinCC versions on the engineering station, redundant OS servers, and other affected OS stations. Confirm the update path against the Siemens Readme and the installation notes for the actual system.
Preserve the project and station backups required by the site's PCS 7 update procedure. Review redundant-server health and schedule the update so that redundant partners are not maintained simultaneously.
Obtain PCS 7 V9.0 SP3 UC04 from Siemens Support entry ID 109780528. The UC06 Readme lists PCS 7 V9.0 SP3 or UC01, UC02, or UC03 as UC04 installation prerequisites and describes the UC04 setup and SIMATIC Management Console rollout.
Install UC04 according to the applicable Siemens update instructions across the required PCS 7 stations. The Readme says UC04 updates the installed PCS 7 V9.0 SP3 software and does not allow individual products to be selected or skipped. Do not update only one redundant partner unless the version-matched instructions explicitly allow that sequence.
After the update, verify installed component versions and observe both OS servers through normal startup and runtime operation. Check whether the self-diagnosis message recurs and whether redundancy remains healthy before closing the maintenance activity.

Interpreting the Evidence

The support reply is the direct evidence for the reported resolution: Siemens Support told the system owner that UC04, through its included WinCC update, resolved the issue. The official PCS 7 Readme independently confirms that UC04 includes WinCC V7.4 SP1 Update 19 and supersedes UC03, which included Update 18. The Readme does not publish a TLGRT defect entry matching the message, so the case report should not be generalized into a universal defect statement.

Verification

Record the exact PCS 7 UC and WinCC update levels before and after maintenance. Monitor the affected TagLoggingServer participant, OS self-diagnosis messages, server restart events, and redundant status during an observation period appropriate to the plant. Confirm that operator monitoring remains available and that no recurrence occurs under the conditions that previously triggered the restart. Successful installation alone does not confirm the reported symptom is resolved.

Limitations and Operational Precautions

The ticket does not provide the screenshot, Windows event logs, exact WinCC update level before UC04, or a detailed support case analysis. The public UC06 Readme identifies UC04's component versions and general corrections but does not identify this exception as a named fix. Use the resolution as the outcome reported for this installation and seek Siemens Support assessment if the message or restart continues. PCS 7 updates on redundant systems require coordinated maintenance, backups, and version-specific sequencing; do not update both redundant OS partners at the same time.

Engineer FAQ

Which update resolved the reported restart?

The reported Siemens Support resolution was PCS 7 V9.0 SP3 UC04, whose included WinCC update corrected the issue in that installation.

Which WinCC update does UC04 include?

The PCS 7 V9.0 SP3 UC06 Readme's component table lists WinCC V7.4 SP1 Update 19 for UC04 and Update 18 for UC03.

Does Siemens' public Readme explicitly list this TLGRT exception as a fixed defect?

The Readme section reviewed here lists general UC04 improvements and component versions but does not identify this exact exception. The specific fix attribution is from the support outcome reported in the case.

Should UC04 be applied only to the OS server that restarted?

Do not assume that. Apply updates to the PCS 7 stations required by the version-matched Siemens update instructions, coordinating redundant components and checking compatibility across the system.

What if the restart continues after UC04?

Capture the exact message, timestamps, Windows and WinCC logs, installed PCS 7/WinCC component versions, and redundant status, then request Siemens Support analysis. The reported resolution does not diagnose other causes of similar restarts.

Technical References

Siemens, PCS 7 Readme V9.0 SP3 UC06 (online), A5E49978550-AH, §5.23–5.24 and “Software components in SIMATIC PCS 7 V9.0 SP3 + UC06,” pp. 82–83, 90–91. Documents UC04 replacement, prerequisites, general software improvements, and WinCC V7.4 SP1 Update 19 in UC04 versus Update 18 in UC03. PDF.
Siemens Support, PCS 7 V9.0 SP3 Update Collection 04, entry ID 109780528. Listed by the Readme as the UC04 download entry.

PCS 7 V9.0 SP3 update collections

WinCC TagLoggingServer diagnostics

How PCS 7 V9.0 SP3 UC04 Resolved a WinCC TagLoggingServer Restart