electrical parts of machinery or apparatus - renewal of the pls sewage treatment plant in hetlingen - delivery of pcs 7 components./ the azv südholstein operates the sewage treatment plant in hetlingen and intends to modernize the process control system including the subordinate automation technology from 2023. the siemens pcs 7 system is to be used as the future process control system. this tender only includes delivery services for pcs 7 components. all components must be suitable for the siemens pcs 7 process control system in version 9.1.