The hierarchical structure is widely used in DCS communication networks due to its openness, reliability, and real-time performance. Each level of the network can be configured with different topologies and protocols based on specific needs, allowing for flexible and efficient data transmission. Typically, a DCS system includes a fieldbus layer for connecting smart field devices, a control network for communication between controllers and servers, and an operation management network for operator stations and engineering stations. Some systems integrate the control and operation networks into one, such as ABB’s PROCONTROLP, Siemens’ TELEPERMXP, and Honeywell’s TDC3000. In addition to these layers, some systems include a plant-level information management network (MIS) for overall production management and scheduling. However, due to lower reliability and complex wiring, MIS networks are often separated from the real-time monitoring network (SIS), which connects various DCS systems and load distribution stations for real-time optimization. A key benefit of the hierarchical structure is that it isolates network traffic at each level, improving both real-time performance and fault tolerance. For example, if the operation network fails, it does not impact the control network. Vendors can also choose appropriate topologies and protocols, such as using standard Ethernet and TCP/IP to enhance system openness while reducing costs. To further improve efficiency, especially in Ethernet-based systems, segmentation techniques are employed. This involves dividing the network into smaller segments to reduce traffic and improve response times. For instance, in the operation management network, two independent Ethernet segments can be created, connected via a bridge, allowing servers to handle fewer nodes at a time. This approach enhances system performance and redundancy, as seen in systems like Bailey’s SYMPHONY and Hitachi’s HIACS5000. Similarly, control networks can be segmented based on functional areas, such as combustion or water supply systems, to reduce communication load and improve real-time performance. Proper placement of control cabinets is crucial to minimize latency. By grouping devices that frequently exchange data on the same network segment, communication speed and reliability are significantly improved.
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Network cabling products Quality Control Instruction:
To offer a perfect product, we every worker pay attention to each detail of our network cabling products. With our company aim, first in our purchase department, our purchaser compares strictly in raw material suppliers to control cost but keep quality, our mold workshop makes inspection before plastic parts turned to production line .Before installation, our production line first will inspect on plastic parts and other components. During production procedure ,there is tester in steps according different products needs. After installation, the Quality Control members will make a full inspection on characters, appearance according our specification.
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