Visualizes data points as curves over time to help identify trends or anomalies. Typical Configuration Workflow Setup History Buffer: In DOPSoft, navigate to History Setup
| Problem | Likely Cause | Fix | |---------|--------------|-----| | No data logged | Storage device not detected | Check SD/USB is FAT32, inserted before power-on | | Old data missing | Cyclic mode overwrote | Increase max file size or use "Stop when full" | | Garbled CSV | Encoding mismatch | Open with UTF-8 or use Notepad++ | | Log stops after 2GB | FAT32 limit | Use multiple files (auto-split) or exFAT (if supported) | | Trigger not working | Wrong trigger address | Verify PLC address is accessible (test with numeric display) | delta hmi data logging
Captures data only when a specific condition is met, such as when a PLC bit is turned ON. Storage and Retrieval Visualizes data points as curves over time to
Many engineers ask, "Why not just use the PLC to store data?" While PLCs are excellent at logic and real-time control, they lack file systems and large storage capacities. Delta HMIs bridge that gap. Here’s why you need HMI-based data logging: Delta HMIs bridge that gap