Data Logging (Advanced Model)

Presentation

When data sampling is activated, the Panel Server Advanced historizes (or logs) the sampled data.

Data is logged in the logging memory. The memory stores approximately three years of data of a system (calculated based on a maximum of 500 data points sampled per minute) or 788,400,000 measurement data points. For more detail about quantities of logged data, see Calculating Time Period of Historized Data.

When the logging memory is full, new data points overwrite the oldest data points stored.

Availability

This function is available on Panel Server Advanced.

In addition to published data, the historized data is available on the Panel Server webpages at Home and at Data Trending.

Setting the Parameters

To enable data logging, activate data sampling on the Panel Server webpages, at Settings > Data Management > Data sampling.

Data Logging Configuration

Configure data logging in the same way as for data sampling.

Consider the maximum number of data points that can be stored and the recommended sampling limits when configuring data logging.

Logging too many data samples per period may affect your Advanced model performance, including degraded web page response, missed logging periods, and less responsive Panel Server operation.

NOTE: Historical data is maintained if the settings of a measurement are modified. Refer to Changing the Data Sampling Frequency.

Data Logging Configuration from Cloud Application

When a Panel Server Advanced is connected to a cloud application, the data that is sampled and published is logged in the Panel Server Advanced in addition to being published to the cloud application.

NOTE: The Panel Server Advanced publishes the last three months of sampled data when publication is activated.

The logged data can be seen in the Trending screens. The sampling and publishing configuration is directly received from the cloud application and cannot be set with the Panel Server commissioning webpages. The logging memory of the Panel Server Advanced serves as a buffer if the cloud connection is lost. The data is published when the cloud connection is restored.

Calculating Time Period of Historized Data

The logging memory stores up to 788,400,000 data points. The equivalent period of time depends on the number of connected devices and the sampling period of each device. Use the following formula to calculate the period of time over which your Panel Server stores data.

Calculate the number of sampled data points per minute for your Panel Server:

(Number of devices x Number of measurements) / Sampling period = Number of sampled data points per minute (Ndp/m)

Divide the total number of data points that can be stored by the number of sampled data points for your device and then divide by the number of minutes in a year (525,950):

788,400,000 / Ndp/m / 525,950 = number of years of data logging held in logging memory

The following table shows some examples:

Number of devices	Number of measurements	Total number of sampled data points	Sampling period (min)	Samples per minute	Calculation	Logging memory in years
30	30	900	15	60	788,400,000/60/525,950	24.9
10	200	2,000	10	200	788,400,000/200/525,950	7.5
30	160	4,800	10	480	788,400,000/60/525,950	3.1