106 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 8: Electrical Works  8.23.1 General  8.23 Application Programs, Functions  The following is a description of the main control principles (functions) to be included in the  application programs for the control and monitoring system.  The detailed control programs shall be designed by the Contractor in close cooperation with the  Engineer.  The software for control, monitoring and regulating of the individual machines shall be based on  relevant measurements and/or time control.  The software shall ensure easy and fail-safe operation of the plant and protect the plant against any  operators fault.  All software shall be well structured and future modifications shall be easy.  The Contractor shall include a 10% extension/modification of the application programs in addition to  the necessary modifications to fulfil the requirements. In programs with multiple start of machines, starting between the individual machines shall be time  delayed (adjustable 1-10 sec.).  Start/stop of machines that is part of the programs shall not be possible before the program is stopped  or the machine has been put into operator mode from the monitoring station. It shall be possible to  operate all components when the program is stopped, including the following:   Start/stop of motors   Operating of a motor valve to a specific position   Opening/closing of magnetic (solenoid) valves.  The programs in the PLC’s 's shall in general be designed for adjusting of parameters via the operator  station. Examples of such parameters are timers, limit values for measurements, limit values for step  controls, constants used in calculations, pumping capacities, values for controllers etc.  The program system shall include facilities for 10 parameter sets for each component that is included  in the control and monitoring system.  It shall be possible to store and modify the parameter sets. It shall be possible to recall, modify and  activate the parameter sets from the screen pictures. Parameters for controllers shall be adjustable and  included in the parameter sets.  The parameter sets shall include a stop/start function for programs.  Set points and other parameters shall be adjustable from the operator station and from the operator  units.  Timer values shall be monitored on the screen as dynamical values.  All input/output signals shall be incorporated in the control and monitoring of the plant in accordance  with their logical function and the description for the individual signal. The descriptions of the individual applications programs groups are only intended as a guide for  designing of the specific applications programs.  The descriptions include only the most essential parameters for the programs and it should be expected  to include additional parameters in order to fulfil the requirements  8_Vol3_d4.3_Section 8 electrical works_en_GIR.rev8.doc 