The urban sewage treatment project is a sewage treatment system that collects, transports, treats, and discharges domestic sewage and industrial wastewater (qualified wastewater), including a centralized urban sewage discharge pipe network (implemented by counties and cities), transmission pipelines, Lift sewage pumping stations, sewage treatment plants, discharge outlets, system monitoring and control centers, etc. along the way. Take into account both scattered industrial point sources (industrial wastewater from industrial enterprises) and domestic sewage in urban and rural areas.
The system mainly adopts gigabit network-managed ring network switches. The main control center and field control layer form a ring network. Because the sewage treatment plant is far away from the pumping station, the industrial Ethernet switch GG-H2G8MWS33-53OC-G network-managed industrial Ethernet The two gigabit single-mode optical fiber interface connections of the network switch can meet the needs of network communication transmission within 20 kilometers. Realize the real-time monitoring and automatic control of the sewage treatment process.
The entire network solution has the following characteristics:
●Large bandwidth and fast transmission speed. The overall plan uses a full-duplex 10000Mbps optical fiber Ethernet ring network, and the actual network bandwidth reaches 200Mbps; it only takes 120μs to transmit a 1518-byte frame in one direction.
●The field equipment has the ability to work in a wide temperature environment of -40～85℃ and can adapt to various harsh environments;
●Industrial ring network design, the self-healing time of the ring network is less than or equal to 20ms. When a communication failure occurs, the data will be transmitted along the redundant link, which improves the redundancy and reliability of the network;
●The equipment involved in this scheme adopts redundant dual power input design. When one power supply is out of power due to man-made or natural factors, the other power supply continues to work normally without affecting the data transmission of the communication system;
● Network scalability. Compared with fieldbus, Ethernet has downward compatibility. For twisted pair or optical fiber media, if the transmission speed is increased from 10Mbps to 100Mbps, in most cases there is no need to change the existing wiring, just update the network equipment. Similarly, if the backbone network of the system is upgraded from 100Mbps Ethernet to Gigabit Ethernet, only the network transmission equipment needs to be upgraded, without the need to re-lay optical cables.