1. The network structure of PROFINet There are many forms of network topology based on Ethernet technology. Stars, trees, and rings are common. Stars are typically represented. Linear networks are best suited for use in industrial control systems, but there are few wired network topologies in traditional Ethernet. PROFINet supports all network topologies including line shapes. (1) Star network All stations are connected to the central dispatcher (switch) to form a star-structured network. In a star network, a single site outage does not affect the use of devices at other sites, but the failure of a central switch can cause paralysis on the entire star network. Star topology. The main advantages of the star network are: increasing or removing the flexibility of the site; easy management, supervision and diagnosis of the network; active network formation is concentrated in one place, so it is easy to deal with adverse environmental factors, such as temperature, pollution, etc. Easy to show. The main disadvantage is that because there is a one-to-one physical connection from the switch to each site, wiring is troublesome and the cost is high. (2) Tree network Connecting several star networks together forms a tree network. In a tree network, copper and fiber cables may be mixed, and one switch can act as a star network distributor. The switch performs information routing based on the address and realizes mutual communication. The depth of the cascading of the tree network and the total scalability of the network are only limited by the propagation time of the communication link signals. Using a tree network, you can split a complex system into separate parts. Tree network topology. The main advantages of the tree network are: As the local data communication can be confined within the shape network, the entire network has strong transmission capability, high data security, clear network hierarchy, and high overall network reliability. (3) Ring network When there is a high requirement on the reliability of the network, a ring topology network with redundant functions can be used. In a ring network, the transmitted information passes from one station to the next in a fixed direction, so a mechanism is needed to ensure that at least one network component in the ring still logically treats the ring as a bus. This kind of network component is a switch with a redundancy manager. When a network breakpoint occurs, the redundancy manager can reconfigure the network for a certain period of time to change the direction of data communications. (4) Linear Networks In FCS, the most common form of network topology is a bus, but there is no pure linear network topology in Ethernet. The advantages of the linear network structure are very prominent, such as the most cost-saving wiring, simple network installation, and easy replacement of equipment. PROFINet achieves a linear network structure with the help of switches integrated in various devices. However, compared to PROFIBUS, when a device in the PROFINet linear structure is powered off, the entire back-end network is back, so it is not suitable for use in industrial control systems where each site requires separate breakpoint maintenance. In addition, when the information is transmitted in an online network, the signal transmission delay time increases with each switch. Therefore, the linear network can be used only in those systems that do not require high time. PROFINet linear network topology, switches are integrated in each device. Pe Barrier Tape,Pe Waterproof Barrier Tape,Pe Warning Barrier Tape,Barrier Warning Caution Tape JIANGMEN BAOGUAN ADHESIVE MATERIAL CO.,LTD , https://www.baoguantape.com
The network structure of PROFINet