Lonworks (LocalOperaTIngNetwork, Local Operation Network) is an open, fully distributed monitoring system dedicated network platform technology. With its unique features, it has become one of the most powerful and market-efficient buses in all existing fieldbus networks. Its technology has been adopted by many national norms in China. It uses a large-scale integrated neuron chips with distributed control and communication networking functions to form various intelligent monitoring nodes, and each node constitutes a fully distributed local operation through a network transceiver (TranReceiver) and network communication media. Network (referred to as LON network).
Lonworks technology is actually a measurement and control network technology, specifically an industrial control network technology, also called fieldbus technology. It can easily realize the networking of field sensors, actuators, meters and so on. This kind of network is different from the local area network, but it is a kind of industrial control network because it transmits monitoring information, status information and control information with small data volume.
Lonworks' core technology is a three-bit 8-bit CPU neuron chip (NeuronChip) with both communication and control functions, and the Lontalk protocol and 34 common I/O control objects. It adopts the complete seven-layer communication protocol in the IOS/OSI model, adopts the object-oriented design method, and Lonworks technology calls it “network variableâ€, which simplifies the design of network communication into parameter setting. This not only saves a lot of design work, but also increases the reliability of communication.
Lonworks transmission methodSingle-ended mode: mainly used for fiber optic cable, copper shaft cable, or wireless RF transceiver
Differential mode : mainly used to connect twisted pair network transceivers.
Lonworks structural modelLonworks adopts all seven layers of communication protocol structure of open IOS/OSI model, and has the basic functions of LAN. Its compatibility with heterogeneous network is better than any existing field bus. It is known as universal control network, and it also provides The interface of the LAN, thus achieving an organic combination of the two.
Lonworks hierarchy
The Lonworks Control Network structure consists of five major parts:
1, network protocol (Lontalk)
2, network transmission media
3, network equipment (including: intelligent measurement and control unit is the node, router and gateway)
4. Execution agency
5, management software (Lontalk open communication protocol)
1, the router
Routers are an important part of Lonworks technology for connecting Lonwork networks of different media. In Lonworks technology, routers also include the following: repeaters, bridges, and routers. In addition to the Lonworks network that connects different media, routers can also control network traffic to increase network speed.
2. Communication media
Communication media is the physical medium for information transmission between nodes, including twisted pair, power line, infrared, fiber optic cable and coaxial cable.
3, network management tools
After the node is built, the nodes need to communicate with each other. This requires a network tool to assign addresses to the nodes on the network, and also to connect the network variables of each node by function. - Once the network is up and running, it needs network management tools to maintain and monitor it.
4, Lontalk support for large networks
The first layer structure is the domain: the structure of the domain can ensure that the communication in different domains is independent of each other;
The second layer structure is a subnet: each domain has 255 subnet subnets which can be logical groupings of one or more channels;
The third layer structure is a sub-point: each subnet has 27 nodes, so a domain has a maximum of 255*127=32385 nodes.
In addition, each neuron chip has a unique 48-bit ID address.
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