Re-advertisement: Bids are hereby invited for the following: Partial upgrade of dewatering PLC units at Northern Works for a period not exceeding six (06) months. Scope of work: The scope of work to be performed under this contract include partial upgrading of the Dewatering PLC units. The works shall be executed on existing infrastructure and certain sections of the existing installation may be live during installation. The prospective tenderers shall take into consideration all safety precaution requirement in compliance with the Occupational Health and Safety Act, 1993 with associated Regulations. The work to be carried out at Northern Wastewater Treatment Works, Dewatering Shed. PLC and SCADA Works: Partially upgrade ten (10) Belt Presses and two (2) Master PLC units: • Collection of updated PLC backups including data files – online with existing; • Inspection of panels for space and location of new M580 racks; • Conversion of PLC programs using the UMAC tool to M580; • Supply of new needed PLC equipment and license; • Mounting of M580 backplanes, installation of the new PLC equipment to panels and installation of communication equipment; • Retaining of Premium, I/O’s; • Downloading of the converted PLC programs into the new CPU’s; • Conversion of the Premium I/O’s to M580 PLC via backplane extender; • Testing of SCADA communication with regard to the PLC partial upgrade; • Restoration of SCADA where necessary with regard to the PLC partial upgrade; • Restoration of SCADA functionality on select related equipment or sub-systems; • Commissioning and monitoring of the plant; • Supply of store PLC spares (where specified); • Repair of damaged PLC equipment (service exchanges); • Supply licenses. (Tender №94642207)