SEAMLESS Trend Display only showing historical data from Direct Log
- 1 Direct Log (OPC DA)
- 1 Hierarchical Log sampling data from Direct Log
- 1 IM Log sampling data from Hierarchical Log
Within the Object Trend Displays SEAMLESS Log name are configured.
As per info in Configuration Manuals we understand SEAMLESS setup should present data from both Direct and Hierarchical Logs "seamlessly" at the same time.
In our case we only see data from Direct Log and have to manually change to Hierarchical Log to see data over a longer time span.
Direct Log is set up to collect OPC DA data using Storage Min Time 1 sec, Storage Max Time 10 Sec, Storage Time 1 week
Hierarchical Log is set up to data from Direct Log using Storage Min Time 10 sec, Storage Max Time 100 Sec, Storage Time 10 weeks
IM Log is set up to collect data from Hierarchical Log using Sample Interval 30 sec, Storage Interval 1 Minutes, Sample Blocking Rate 30 Minutes over a 2 year Log Period
Momentary and ExtMomentary retrieve all points from the log and paints a vivid trend, but only primary (raw) logs are considered. ExtMomentary is recommended over Momentary to avoid sending overlapping points to the trend and "repaint already painted pixels". ExtMomentary act like a "compressor", but only overlapping points are removed before sending the points to the trend.
You must use TimeAverage treatment if you want all logs to be considered by the SEAMLESS algorithm.