Standard Technical Features of BTG System for Supercritical 660 ...

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitse) Historical storage and retrieval system (HSRS)The HSRS shall collect, store and process system data fromMMIPIS data base. The data shall be saved online on hard disk andautomatically transferred to erasable & removable type disk/ driveonce in every 24 hours periodically for long term storage. Thecapacity of removable disk/ drive shall be sufficient to store at leastone month data.The data to be stored in the above system shall include alarm andevent list, periodic plant data, selected logs/reports such as eventactivated logs, sequence event log, trip analysis log, start-up log etc.The system shall provide operator function to retrieve the data fromhistorical storage. The operator shall be able to retrieve the selecteddata on either colour TFT or printer and suitable index files/directories shall be provided to facilitate the same.17.2.8 System programming, maintenance and documentation facilityThe programmer stations shall be provided for on-line configuration & tuningof control system and on-line program development/ modifications inMMIPIS. In addition, latest state of the art work-station based systemdocumentation facility shall be provided to retrieve, generate & document allsystem documentation, logics, control loops, cable interconnection, etc. toachieve paperless documentation for the complete plant.i) Control System Structuring/ Configuration/ Tuning Facilitiesa) Structuring, configuring and tuning facilities shall be provided forstructuring, modification, storing, loading, testing, tuning,monitoring, etc. of all the microprocessor based controllers of thecontrol system. The configuration and tuning unit shall be hookedup with the system bus. In case different hardware is employed fordifferent parts of control systems and it is not possible to providestructuring/ configuration and tuning of these from the samestation, necessary number of stations shall be provided for thepurpose.b) It shall be possible to configure the system with ease without anyspecial knowledge of programming or high level languages.Control strategy shall be implemented using familiar andconventional automation function blocks (software implemented).c) On-line tuning of the control loops shall be possible withoutcausing any disturbance in the execution of the control loops.Provision to store and retrieve on immediate and long term basisthe system configuration, data base etc. on a storage device shallbe included. Facility shall be provided to reload/down-load thesystem or controller module from the already stored data, on-line.158
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsii)iii)MMIPIS Program Development/ Modification and System MaintenanceFacilitiesStandalone online system shall be provided for programmedevelopment/modification to achieve various functions includingdevelopment, modification and testing of software of MMIPIS,generation and modification of graphics, logs, HSRS functions in aninteractive manner, MMIPIS database modification/creations,downloading the software with associated data base from the consoleand other features necessary for system maintenance. All operatorfunctions shall also be available on MMIPIS programmer station.System Documentation FacilityThe system shall have the facility to generate the associateddocumentation for both the control system & MMIPIS. The documents,to be generated by the system shall include P&ID drawings, control loopdrawings, sequence drawings, signal distribution list/drawings, systeminterconnection drawings, cabinets general arrangement drawings,measurement list, drive schedule, alarm schedule, system hardware andfunctional configuration drawings for displays, logs, trends, graphics etc.The system shall also include all required software and hardware toolsfor creating, modifying and printing CAD drawings to achieve paperlessdocumentation for DDCMIS.17.2.9 Data communication system (DCS)The data communication system shall be provided for communication betweencontrol system and MMIPIS communication and signal exchange betweenvarious functional groups as well as communication between various units &off site / off line systems.i) The DCS shall include a redundant main system bus and local systembuses for major subsystems with hot back-up and other applicable bussystems like cubicle bus, local bus, I/O bus etc except back plane whichcan be non- redundant. The DCS shall have the following minimumfeatures:a) Redundant communication controllers/ communication ports shallbe provided to handle the communication between each functionalgroup of controllers of control system and the system bus. Anyfailure or physical removal of any station/module connected to thesystem bus shall not result in loss of any communication function toand from any other station/module.b) Built-in diagnostics shall be provided for easy fault detection.Communication error detection and correction facility shall beprovided at all levels of communication. Failure of one bus andchangeover to the standby system bus shall be automatic andcompletely bumpless and the same shall be suitably alarmed andlogged.159
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