86 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 8: Electrical Works  identified for each alarm during development will provide fast access with operators during  operations. Alarm sorting  Alarm record  8.19.9 Trends  Gathering trendes  Viewing trends  8_Vol3_d4.3_Section 8 electrical works_en_GIR.rev8.doc  Trend values will be stored by fluctuating point resolution and rescaling will not be required for  retrieval or viewing. This will prevent deviation from accuracy also it will ensure labels to be  configured according to new scaling intervals without compromising from integrity of storage pool. Trend data can be executed as periodically for example as sample for each sampling period or  according to event for example retrieving in the event that certain condition is realized. Storage of  trend data can be started or stopped with respect to several conditions such as status and time or  manually by operator. Trend data will be retrieved transparently from historical data archive independent from archive file  where data is located and from date of data which is received. Trends will be accessed online by  operator research without requiting backup or reload historical data file. Historical data upto for last one years will be present in each file with 3 second sampling interval.  Files will be joined for creating configurable historical data. Minimum 3 year data with 10 seconds  sampling interval will be stored in historical data archive. Trend information will be able to be recorded with sampling periods which can be configured between  1 millisecond and 24 hours by using software. Trend data will be able to be configured by number of  file, size of file, sampling period, file location, priority and trend tag and will be recorded in circular  file system together with field information. Length up to 255 characters will be supported for Name  and path for stored files Number of trends to be collected will not be limited by software. Operator interface software will provide opportunity for all users over network to record. Software  will be able to direct printing operations to other printer when system is online. Alarms will be able to be recoded in printer, disk file or database together with text, time and date.  Alarms will be printed or filed in format which can be changed by user. Different alarm recording method will be able to be specified for each alarm category. It will be able  to be determined whether alarm is recorded When Alarm status changes as ON, OFF or acknowledged  Time when alarm will remain active before notification to operator will be able to be adjusted. Time  label which is present over alarm should be time when alarm is enabled rather than completion time of  time delay. Alarm Delay  Tag, Name, Category, Field, Priority, Status, ON Time, OFF Time, Acknowledge Time  Sorting will be made in alarm screens according to one or more alarm lists without having any  grouping limitation. (Ascending or descending). It will be able to make sorting by clicking over  headers in alarm list.