Municipal Sewage Treatment Plant Networking System Date: 12/10/2009 Environmental & Facility Management Tianjin, China Project Introduction: The municipal sewage treatment in Tianjin, China is currently one of biggest sewage treatment plants in China. Not only is the layout well designed, but many of the systems and processing techniques are most the advanced in the country, with various techno-economic indicators reaching the highest level in China. This plant has applied state-of-the-art Advantech industrial communication products, which can realize the communication between the lower level controllers in each system so as to ensure real-time communication between control systems, monitoring data and the central control room. System Requirements: When looking to establish a reliable communication ring within theirnetwork infrastructure the Tianjin Capital Environment Protection Group needed switches with strong industrial designs capable of heavy use in their hazardous environment, and products with EMC indicators that conformed to a high industrial grade standard. They also wanted devices which used standard 35 mm DIN-rail mounts so as ensure the device can be directly installed in control cabinet.. Project Implementation: System Diagram: System Description: This system applies state-of-the-art fiber optic Ethernet ring technology, which appropriately combines lower level devices with central control room. The system uses Advantechs to constitute an X-Ring  Advantechs ultra-fast redundant ring. The main path in the ring is used as a forward-path; when the Ring Master is set, a backup path is generated. If any link in the ring is broken, the Ethernet ring will activate the backup path automatically (within 10ms) to ensure normal communication. The industrial designed combined with a stable and reliable redundancy mechanism, guarantees the safety and stability of the whole communication system. Conclusion: In conclusion, there were 5 main benefits derived from applying Advantech's EKI series to this application as below: Optimized redundancy within a fiber optic Ethernet ring A single point failure will not influence normal operation of the system It can work stably under humid, high-temperature environments Excellent management methods Easily upgradeable firmware