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.
Turning Conveyor device is a new product developed. It is a new type of equipment developed for the bending of underground tunnels in coal mines. Once the equipment is changed, multiple belts are required at the turning of tunnels. With the transportation method of tower connection, one machine can realize the purpose of turning and reversing, so that one device can replace multiple transfer devices. No need for power, save time, electricity, installation, safe and reliable, can realize any angle conversion between 0-180 degrees left and right. Realized the revolution of underground belt transportation in coal mines. The Belt Conveyor turning device has a wide range of use, which can make the belt conveyor realize horizontal turning, up and down turning, combined turning, and up and down slope-changing operation (the belt pressing function can be realized in the up-and-down slope-changing operation to prevent the generation of streamers). Originally, multiple belt conveyors were required to be lapped for conveying. Now, this device can achieve the purpose of reversing and steering with one machine, which can save electricity, labor, equipment, installation, and electrical control. The device adopts the cut-disc type long satellite roller steering roller to ensure that the conveyor can eliminate the axial force in the plane corner operation and achieve the purpose of belt reversing. Any conversion angle between 0° and 180° can be achieved. Performance parameters and use range Use range and parameter selection Steering angle: 0°~1 80° can be achieved Bandwidth: 500mm~1 400mm Models: all belt conveyor turning times: 1~2 times Resistance coefficient: K=1. 08~1.1 2 External dimensions: see the table on the right Main features: Saving investment: Saving investment in equipment such as nose, tail, slide, and electronic control. Reduced personnel: no need for special personnel to be on duty, reducing jobs and increasing the safety factor. Energy saving: The equipment does not need power, which reduces the installed capacity and saves a lot of power consumption. Reduce costs: The device has a simple structure, saves time, electricity, and labor, and greatly reduces operating costs. Easy installation: no need to increase the height and length of the roadway. Scope of application: The scope of application is very wide, which can make the belt conveyor realize horizontal turning, up and down turning, combined turning, and up and down slope-changing operation (the belt-pressing function can be realized during the up-and-down slope-changing operation to prevent the generation of streamers). The reversing system can be considered when the following conditions are present. 1. In a transportation system, the reversing system is most suitable to use the reversing system, which can save labor and electricity. , Save equipment, save electricity control. 2. After the reversing system is used, the belt conveyor can share a machine head, a belt storage device and a tensioning device before and after turning, so that the distance from the tail to the turning point can be very short (the shortest can be only about 4 meters) In this way, in the final mining, there is no trouble in replacing the slipper because the belt conveyor is required to be too short, which greatly improves the work efficiency. 3. When excavating the roadway, using the reversing system to extend the belt conveyor to the excavation head can replace the trouble caused by laying the slide. This saves labor, electricity, and maintenance.
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