An AdvancedHMI v3.99f project intermittently displayed blank values even though the associated tags contained data. The installation logged approximately 8,000 tags, and increasing the CLX driver PollRateOverride from about 1 second to 2 seconds did not resolve the symptom. The evidence therefore supports a version update as the primary corrective action, not further polling changes.
Confirm the Failure Boundary
Verify that the tag has a valid value while the AdvancedHMI field is blank. Record whether affected items are individual tags, BOOL-array elements, or both. This separates the confirmed display symptom from an unproven controller-data or communications failure.
| Observation | Engineering conclusion |
|---|---|
| AdvancedHMI version is 3.99f | The supplied recommendation is to update the project. |
| About 8,000 tags are logged | High tag count is part of the operating context, but the evidence does not establish it as the root cause. |
| PollRateOverride changed from about 1 s to 2 s | The blank-value condition persisted, so this change was not corrective. |
| BOOL arrays are used | Apply the separately referenced BOOL-array patch when updating. |
Use the Correct Target Version
The initial recommendation named version 3.99r, but that statement was explicitly corrected: 3.99p was the current version in the supplied discussion. Do not plan an update around 3.99r based on this evidence. No download location, patch identifier, or later release status is provided.
Update Without Risking the Working Project
- Preserve an untouched copy of the complete v3.99f project before changing files or dependencies.
- Perform the update on a separate working copy and target 3.99p, the corrected version identified in the evidence.
- If the application uses BOOL arrays, apply the referenced BOOL-array patch. The evidence does not provide its filename or installation procedure, so verify those details through the product's official distribution channel.
- Build and test the copied project before replacing the deployed application.
Verify the Correction
Run the updated project under the same logging load and observe the tags that previously became blank. Confirm that valid tag values remain visible and that BOOL-array elements behave correctly when applicable. Keep PollRateOverride history in the test record: changing it from about 1 second to 2 seconds had already failed to eliminate the condition, so another polling adjustment alone would not verify the recommended correction.
FAQ
Why does AdvancedHMI v3.99f sometimes show blank tag values?
The evidence confirms the intermittent symptom but does not establish a root cause. The supported corrective path is to update from v3.99f and separately account for BOOL arrays.
Should I update AdvancedHMI to 3.99r or 3.99p?
Use 3.99p for the evidence-specific procedure. The reference to 3.99r was explicitly corrected to 3.99p.
Will changing CLX PollRateOverride from 1 second to 2 seconds fix blank values?
It did not fix the reported project. Preserve that result, update a project copy, and verify the affected tags under the same approximately 8,000-tag logging load.