Issue
Dynaview chart values in Sigma are incorrect when compared to values displayed from an index entry.
Product Line
Satchwell BAS & SigmaEnvironment
Satchwell Sigma
Cause
When a Sigma Dynaview chart is first opened, it records an initial value. Subsequent updates occur only on a Change of Value (CoV) condition. If the object tolerance setting is too large, minor changes won't trigger updates, resulting in outdated or misleading chart data.
Resolution
To ensure accurate and timely updates in Dynaview charts:
- Close the Dynaview chart.
- Adjust the object tolerance setting using the Sigma Object Editor:
- Reduce the tolerance to a suitable level.
- Download the updated object to the controller.
- Restart the Dynaview chart.
⚠️ Note: Setting the tolerance too low may cause excessive updates, potentially overloading the controller’s communication resources.
Example Tolerance Settings
| Object Type | Suggested Tolerance | Notes |
|---|---|---|
| Temperature Sensor | 0.05 |
Updates every 0.1°C |
| Change of State (Boolean) | 0.5 |
Reflects binary state (True/False) |
| Pressure Sensor (Pascal scale) | 10 |
Suitable for rapidly changing values |
Tool Available
For bulk updates of tolerance settings across Sigma objects, use the Sigma Tolerance Utility.
👉 Download SigmaTolerance.zip
