In 2003, the 62MW exchange station was launched in Aliachem, a.s. in Pardubice, Czech Republic. The exchange station provides heating of the Aliachem company and it is simultaneously connected into the hot-water pipeline of the Power Station Opatovice. It can be used as a back-up source of the hot-water heat. The Reliance SCADA/HMI system along with the PLC Tecomat TC-700 were installed for reliable control of Aliachem's exchange station.
The exchange station consists of two steam-to-water heat exchangers. The powerful water pumps take preheated water from exchangers into the heated spaces of the Aliachem company. Preheated water is also used for heating of Pardubice and Lazne Bohdanec.
The installed PLC Tecomat TC-700 communicates with two CALOR30 temperature gauges over RS-485 serial line. CALOR30 gauges provide temperature measurement of two hot-water pipelines. The gauges use closed communications protocol, which is integrated into the PLC Tecomat TC-700. Data from the temperature gauges is periodically enumerated and converted to the common file formats according to the IEC standards.
The Reliance system provides reliable control of the entire exchange station over transparent visualization windows. The reason the Reliance system was chosen is its wide support of other HW and SW products which were applied during the implementation. Thanks to Reliance, productivity was increased during the installation and the debugging process was simplified during finalization.
Control System topology
Transparent visualization of the SCADA-based system is controlled from one Control Computer located in the Aliachem company.
The SCADA-based system also provides configuration of the users' accounts and their permissions, control of databases, alarms and failure states.