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historical_graphs [2018/12/26 11:39]
emozolyak [Historical graphs]
historical_graphs [2021/07/09 08:27]
atolstov grammar
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   *(1) - calendar for selecting date/period of view   *(1) - calendar for selecting date/period of view
-  *(2) - Graph title +  *(2) - graph title 
-  *(3) - title of a register ( or its legend in the graph settings) and respective values in the selected point on the curve. Because with large time scale there can be more log data in a given pixel of the curve (which corresponds to one X-axis division formed as time span / graph area in pixels )  3 values are shown - minimal, average and maximal. When there are values in the log database for all points of curve in a given time scale, all three values will be the same ( and the curve will look "pure"). See more on this below.+  *(3) - title of a register ( or its legend in the graph settings) and respective values in the selected point on the curve. Because with large time scale there can be more log data in a given pixel of the curve (which corresponds to one X-axis tick representing time span / graph area in pixels )  3 values are shown - minimal, average and maximal. When there are values in the log database for all points of curve in a given time scale, all three values will be the same ( and the curve will look "pure"). See more on this below.
   *(4) - semitransparent color draws a swing between min and max values ​​that the selected register took on a given plot section.   *(4) - semitransparent color draws a swing between min and max values ​​that the selected register took on a given plot section.
-  *(5) - Line of averaged values. +  *(5) - line of averaged values. 
   *(6) - line of (almost) exact values.    *(6) - line of (almost) exact values. 
   *(7) - viewport slider. You can move the viewport slider along the time axis, thus choosing the interval of interest with the same time scale   *(7) - viewport slider. You can move the viewport slider along the time axis, thus choosing the interval of interest with the same time scale
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 ==== Log data size considerations ==== ==== Log data size considerations ====
 +
 +By **log** it is considered all the data, that accumulates on the device, such as:
 +events log, event's registers log, meter's log, register's graph log, register's log and so on.
  
 The log depth can be adjusted in the Setup / Settings menu: The log depth can be adjusted in the Setup / Settings menu:
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 Theoretically, the volume of the archive is limited only by the size of the flash card. Theoretically, the volume of the archive is limited only by the size of the flash card.
-In practice, when the archive size is increased by more than 300MB, the 'response time' in the interface when working with WebHMI can increase and affect the comfort of the user's work. It should be said that storing large amounts of data is not the target application of the device, although it allows it to do so. These graphs should be used during the research stage of the monitoring object, keep the archive for analysis of certain situations (which after use can be deleted), etc. For long-term storage of a large amount of monitoring data, it is recommended to use a special server - fetching log data via the API or the Level2 cloud server option.+It should be said that storing large amounts of data is not the target application of the device, although it allows it to do so. For the big amount of monitoring data, it is recommended to take care of data redundancy and use a special server which fetches log data via the API to the DB or the Level2 cloud server option.