Viewing Collection History (Time Series Graphs)
Values collected by the gateway are stored as time series data and can be used for graphing / analysis.
This gateway screen focuses on "current values"; graphs over time and history queries are handled by the companion tools installed alongside it.
Which tool should I use?
Look at the icons in the upper right of the gateway.
| Icon | Tool | Purpose | Default port |
|---|---|---|---|
| Graph | Time Series Data Analyzer | Time series analysis / download of tag values | 7800 |
| Dashboard | Advanced Dashboard (Grafana) | Building real-time dashboards | 3000 |
| Node.js logo | Node-RED | Data flow / post-processing / external integration | 1880 |
| System | System Management (Cockpit) | OS resources, network, service management | 9090 |
Clicking an icon opens the corresponding tool in a new window (it must be running on the same host as the gateway).
Time Series Data Analyzer (port 7800)
Specify a tag ID and a time range to view graphs or download CSV files.
For detailed usage, refer to the analyzer's own help. This manual only covers how to find the tag ID.
Finding a tag ID
- In the gateway [Connections] menu, click the PLC
- Click a row in the [Tag List] on the right to view its details — copy the tag ID shown there
- Paste it into the analyzer
Example tag ID format: OPC_LS_XBM_0001_TAG_00001
Grafana dashboards (port 3000)
Use this when you want to build dashboards for operations or management meetings.
- Register the values sent by the gateway as a data source
- Drag and drop panels (graphs / gauges / single values, etc.) into place
- Alarm / threshold notifications can be configured
Default login credentials vary by environment, so check with your system administrator.
Node-RED (port 1880)
Use this when you need more complex processing (e.g., conditional branching, combining values from two PLCs to compute a new value, sending notifications to an external API).
- Takes MQTT messages published by the gateway as input
- Outputs the processed result back to MQTT / a DB / email, etc.
Since you can draw data flows visually, most processing requires little or no code.
Frequently asked questions
Q. The graph tool won't open
- It only works if it is installed on the same PC as the gateway.
- Check whether the PC's firewall is blocking the relevant port (7800 / 3000 / 1880 / 9090).
- Ask your system administrator to confirm that the companion apps are running.
Q. I can't see older data
The gateway's time series storage period depends on the configuration (typically 30 days to 1 year). If you need a specific retention period, ask your system administrator to increase the "time series retention period (TTL)".
Q. I want to show this to people in other departments
Build a Grafana dashboard and share its URL, or embed it in your company portal. This requires an internal network where anyone can reach the gateway IP.
Q. I want to pull the data myself for analysis
You can query tag values and time series directly via the REST API. See Advanced — REST API for usage.