---
title: "Historian | Appendix | N3uron KB V.1.20"
slug: "historian-appendix"
description: "Historian is a N3uron module designed to provide a high-performance time-series storage system based on a MongoDB database. In x64 bit systems…"
updated: 2021-12-16T09:48:11Z
published: 2021-12-16T09:48:11Z
canonical: "docs.n3uron.com/historian-appendix"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.n3uron.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Appendix

## WebUI Historical data interface

WebUI historical data interface is a rich HTML5 interface used for visualizing historical data. This section of **N3uron** allows users to configure various parameters in order to monitor the historical data of selected tags.![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/20-WebUI-Historical-data-interface.png)Figure 20: WebUI Historical data interface

The following properties can be configured:

- **Tag list:** a tree menu that shows all available historized tags. In order to visualize a tag’s historical data, drag and drop the tags in the Selected **tags** area.
- **Configuration:** Visualization parameters available in **Configuration** area:
  - **Date mode:** Allows for different ways of specifying the start and end dates for displayed data.
    - **Relative:** Allows users to select the start and end date according to the current date.
    - **Absolute:** Allows users to select a start and end date as absolute dates.
    - **Current:** Allows users to select an interval between the current moment and a previous moment defined by the offset.
  - **Date:** Configuration for the different Date modes:
    - **Relative:** Start and end dates are configured using an offset in days or weeks and a time offset in milliseconds
      - **Offset:** Offset relative to current moment.
      - **Time:** Absolute offset over the relative offset.
    - **Absolute:** Allows dates to be specified as absolute values.
      - **Start:** Absolute start date.
      - **End:** Absolute end date.
    - **Current:** Allows the date to be specified between a selected negative offset and the current moment.
      - **Offset:** Negative offset from current date.
      - **Units:** Offset units (seconds, minutes, or hours).
  - **Mode:** Configuration of data representations.
    - **Aggregated:** Allows users to aggregate data using different methods.
    - **Raw:** Presents data as per how it is stored in the historical database.
    - **Delta:** Only presents values when they have changed more than the deadband value. Includes all values after the change.
    - **Filter:** Only presents values when they have changed more than the deadband value. Includes all values before and after the change.
  - **Mode configuration:** Configuration properties for the different modes.
    - **Aggregated:**
      - **Aggregation method:** Aggregation type applied to the data. Choose between:
        - **Tag configuration:** Value configured within the tag.
        - **Avg:** Weighted-time average for the selected aggregation interval.
        - **Min:** Minimum value for the selected aggregation interval.
        - **Max:** Maximum value for the selected aggregation interval.
        - **First:** First value for the selected aggregation interval.
        - **Last:** Last value for the selected aggregation interval.
    - **Aggregation interval:** Interval for the aggregated data:
      - **Value:** Interval value.
      - **Units:** Value units.
    - **Raw:** No special configuration, raw values.
    - **Delta and Filter:**
      - **Deadband:** Defines the data change threshold.
  - **User presets:** Configuration properties can be saved as presets. Previously saved presets can be loaded via this parameter.

After applying the retrieval parameters in **Configuration**, the WebUI shows the historical data of the selected tags with the following options:

- **Autoreload**: Enables a periodic reload of the data.
- **Return to configuration view**.
- **Reload selected tags**.
- **Download:** Downloads a CSV file containing historical data.
- **Data visualization:** Data can be visualized in two ways: a **chart** or a **table** with date/value representation.

![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/21-Chart.png)

Figure 21: Chart

![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/22-Table.png)Figure 22:Table