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It shall run on rechargeable battery when it is not connected to the external power supply. The battery capacity shall last app.4 hours. The weight with battery shall be less than 3.5 Kg. An extra mouse similar to the mouse for the stationary computers shall be provided. A bag shall be included. 

## 8.22 Communication Network 

## 8.22.1 Data Handling 

## General: 

All data necessary for control and monitoring of the plant shall be collected. 

The program shall collect the real-time data that is necessary for a correct calculation and transmission of all service parameters. 

The program shall be arranged in a way that allows the operator to select the service parameters. In addition it shall be possible for the operator to extent the number of service parameters. 

The data collection shall function independently of all other program facilities in the control centre. 

All data shall be identified with the time of collection. The time interval shall not be higher than 0.5 sec. 

The cycle time for data collection shall be adjustable by the operator from 1-30 sec. The data collected is named scandata. It is accepted that scandata only is logged when there is a change in the value. This is to reduce the extent of the logging. All changes shall nevertheless be logged. This goes for parameters, analogue values, states etc. 

Calculation of the minimum mean-value of the scandata shall be possible within an interval of 1-30 min. (basic time). The calculated mean values are named basic data. These basic data are used for calculation of hour-, daily-, monthly and yearly mean values that are used in the reports. 

The data shall be stored in accordance with the values indicated below: 

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It shall be possible to delete data. The program shall however automatically prevent data to be deleted that have been stored less than indicated in the above table. 

