Tag Database Overview
The Tag Database in DataTalk is a central tool for managing and structuring tags within a project. It serves as a hub for creating, editing, and organizing tags, as well as defining their data types, limits, and other key properties. Additionally, the Tag Database enables real-time interaction with PLCs, providing live data monitoring and logging functionalities.
Key Features:
1. Tag Creation and Management:
- Add, modify, or delete tags.
- Define tag properties such as data type, scale, limits, and more.
- Centralized changes: When limits or properties are modified in the Tag Database, those changes apply universally across the project wherever the tag is used.
2. Real-Time Data Display:
- Tags can display live values read directly from PLCs.
- The “Read Values” feature allows you to view current data from “expanded” connection tabs.
3. Limits for Alarms and Alerts:
- Define limits for each tag to set thresholds for system checks.
- If a tag’s value exceeds the specified limits, it can trigger alarms or animations.
4. Log Groups for Data Logging:
- Assign tags to log groups to log their values over time.
- Logged data can be visualized in charts or tables.
- Data is logged only when the tag value changes, with the period determining how often the value is checked for updates.
5. Integration with Animations and Alarms:
- Tags can act as triggers for animations and alarms, creating a dynamic and interactive project environment.
| Feature | Feature desc. |
|---|---|
| Value | Displays the live value read from the PLC when “Read Values” is clicked. |
| Address | Specifies the data point’s address in the PLC. |
| Type | The data type of the tag (e.g., integer, float, boolean). |
| Access | Controls user access to specific tags. |
| Label | Serves as internal notes; additional language-specific fields appear if multiple languages are configured. |
| Scale | Enables automatic scaling of values during read/write operations (e.g., multiplication or division). |
| Limits | Defines thresholds for alarms/alerts. |
| Log | Indicates whether the tag’s values should be logged. |
| Log Groups | Assigns the tag to a log group for data logging. |
| Unit | Specifies the unit of measurement for the value (e.g., °C, kPa, etc.). |
| Format | Allows formatting of tag values (e.g., setting default decimal points). |
| Gateway | Enables gateway configuration for advanced networking setups. |