The disposal and public transport services (EVB) of Wismar are responsible for the city's drainage system, operating a sewage treatment plant and managing over 300 kilometers of channel network with pumping stations. To address the challenge of reliable wastewater disposal, especially in critical areas like water protection zones, they need to modernize and expand their electrical engineering systems as well as increase the system availability. The wide distribution of the customer demands for preservation of the status quo led to the need of development of the communications processor.

The solution involves expanding their proven system: Actemium H&F, familiar with Wismar's existing automation and control technology, upgrades the system using -SIMATIC RF620T transponders -SIMATIC S7-300 controllers -SIMATIC S7-400 -SINAUT ST7 protocol -SIMATIC S7-1200 controller -SIMATIC touch panel