Issue
Sigma graphics either update only when first opened or only some graphic data values continue to update, while others remain static.
Product Line
Satchwell BAS & Sigma
Environment
Satchwell Sigma Graphics
Cause
Sigma graphic updates are governed by the tolerance setting on each Sigma object. This setting determines the threshold for value changes that trigger an update from the controller to the server. If the tolerance is set too high, minor changes in values may not be transmitted, resulting in graphics that appear static or partially updated.
Resolution
To ensure regular and accurate updates of Sigma graphics:
- Review and adjust the tolerance settings on the relevant Sigma objects using the Sigma Object Editor.
- Download the updated object configuration to the controller.
- Restart the graphic to apply the changes.
Best Practice Guidelines for Tolerance Settings:
- Temperature objects: Set tolerance to 0.05 to reflect changes of 0.1°C.
- Change of state (binary) objects: Set tolerance to 0.5 to reflect true/false (1/0) changes.
- Pressure sensors (e.g., measuring in hundreds of Pascals): Use a higher tolerance (e.g., 10) to avoid excessive updates due to rapid fluctuations.
⚠️ Note: Setting the tolerance too low may cause excessive communication traffic, potentially impacting controller performance.
Bulk Update Option:
To apply tolerance changes across multiple Sigma objects, use the Sigma Tolerance Utility:
