In the fields of intelligent building and industrial automation, LonWorks network technology and RS485 bus technology are widely used. Analysis of the advantages and disadvantages of LonWorks technology and RS485 bus technology is extremely important for their reasonable application in practical engineering.
At the heart of LonWorks technology is the Neuron neuron chip, which includes a solidified LonTalk advanced communication protocol, three CPUs, a multitasking operating system and flexible input/output methods. The LonTalk protocol provides all seven layers of protocols defined by the OSI reference model. Among them, the 1-6 layer protocol is solidified in the neuron chip, and only the seventh layer application layer is defined according to the application object, which can greatly save development time and cost. Invest.
First, the advanced nature of LonWorks technology has made an excellent control network
LonWorks network technology is an advanced fieldbus technology introduced by Echelon in December 1990. LON (LocalOperaTIon Network) is a local operation network, with all the characteristics of fieldbus technology, and is widely used in international high-end equipment. The core of LonWorks technology is the neuron chip, transceiver and LonTalk communication protocol. The neuron chip is a very large scale integrated circuit with three CPUs inside to control communication and application execution. The neuron chip can form a control network either directly or through a transceiver.
LonWorks node transceivers are available in different types to support different communication media such as twisted pair, power line, wireless, coaxial cable, infrared, fiber optics, and more. The complete LonTalk protocol guarantees the reliability and real-time performance of the communication. This kind of network is a peer-to-peer, interoperable network, with equal status of nodes, no master node, good real-time performance and high reliability. It provides applications for building automation, smart home, industrial automation, rail transit, ship control, flight control and other fields. Excellent control network.
Second, the openness of LonWorks brings benefits to users.
LonWorks technology is very open, and products from different companies that comply with the LonMark standard can work together on the same network. The openness of technology minimizes the possible monopoly profits, allowing users to spend less money and choosing more suitable products for each company. This means that the user has got rid of the limitations of the first supplier, and even in the second phase of the project, the first supplier's products are no longer selected, and the first phase of the project can be connected to reduce the investment risk; at the same time, the future The existing LonWorks network can connect to alarms, help, building automation and other equipment without network investment. Of course, these devices can be purchased from other companies you trust, as long as their products meet the LonMark standard. Such companies are located at home and abroad, and LonWorks technology is developing rapidly in China. Openness gives customers a lot of initiative, and closed systems are difficult to interconnect with other companies' products, increasing the possibility of customers changing product selection in the future, reducing investment risks and high monopoly after-sales service. Profits reduce the total investment of customers in the long run.
Third, the topology of the LonWorks field network is very flexible
When the LonWorks field network uses twisted pair as the communication medium, it can form a bus, star, ring and free topology network. The bus type network can be extended to 2700m without repeaters, and can be expanded by 2700m for each additional repeater. The free topology network can be extended to 500m without repeaters. Each additional repeater can be extended by 500m. In the latter structure, the communication line can be arbitrarily branched, which improves the flexibility of networking, greatly facilitates installation, and reduces system maintenance costs.
Fourth, LonWorks network has a strong expansion capability
Based on LonWorks technology, the building automation system and smart home system can realize remote energy consumption monitoring, automatic energy-saving control, home security and networking with other building automation systems on a large scale. The powerful expansion capability of the field network is the same as ordinary meter reading and security. Compared with the system, it has unparalleled superiority.
5. The high reliability of LonWorks technology has made the system strong anti-interference ability.
LonWorks network technology is suitable for use in a variety of harsh environmental conditions, and is extremely resistant to interference.
Six, LonWorks system maintenance convenience
Add new equipment, change equipment address, adjust operating parameters, upgrade the system, etc. in the field network, just set it through the PC, without changing the hardware equipment.
Seven, LonWork technology has the following advantages compared to the ordinary RS485 bus
1. LonWorks technology is a complete control network technology, which includes everything from the physical layer to the application layer to the network operating system. RS485 is just an interface technology for serial communication.
2, communication media differences: LonWorks technology supports multiple media, working in the same network, such as: twisted pair, coaxial cable, power line, wireless, fiber, infrared and so on. RS485 communication does not support multi-media.
3, topology differences: LonWorks technology supports a variety of network structures such as bus, star, ring, free topology, twisted pair is non-polar. 485 communication can only be a bus structure, and the twisted pair has polarity.
4. Transmission distance difference: The length of the LonWorks technology network can reach 2700 meters (without repeaters). Each subnet can have 64 nodes. The RS485 bus can only be up to 1000m in length and has only 32 nodes per segment.
5, signal processing capability difference: a neuron chip includes 3 CPUs, can handle complex network communication applications, signal interface using transformer isolation. 485 only provides communication interface chip.
6, system openness differences: LonWorks technology has a very good openness, products of different manufacturers using LonWorks technology can coordinate work on the same network. It is difficult for different manufacturers' products using RS485 technology to work on one online.
7, extended function differences: LonWorks technology supports domain, subnet, node and other complete network structure. A domain of each LonWorks network supports up to 32,385 nodes. RS485 communication is difficult to compare with this.
8. Differences in communication methods: LonWorks technology is a peer-to-peer communication network with equal status of nodes, high reliability and good real-time performance. RS485 communication is generally a master-slave structure.
9. Difference in anti-interference ability: LonWorks technology has strong ability to resist common mode interference and can adapt to harsh environments. The anti-interference ability of 485 communication is poor.
10. Differences in construction and maintenance: LonWorks network construction, networking and maintenance are convenient. RS485 communication is very difficult to do this.
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