Industrial Ethernet Switch Principles and Applications

Industrial Ethernet Switch Principles and Applications:

Industrial Ethernet switches, which are used in industrial control field, are open and widely used due to the adopted network standards. They can adapt to low temperature and high temperature, resist electromagnetic interference, prevent salt spray and have strong earthquake resistance.

Ethernet switches are mostly Layer 2. For example, Fengrunda's Ethernet switches work at the data link layer to exchange MAC address data. There is also a third layer, such as Huawei's core switch is working at the network layer.

The working principle is: when a frame arrives, it will check its destination address and correspond to its own MAC address table. If there is a destination address, it will be forwarded. If it does not exist, it will flood (broadcast). If there is no host MAC after broadcast. If the address is the same as the destination MAC address of the frame, it is discarded. If the host is the same, the MAC of the host is automatically added to its MAC address table.

Mainly reflected in the function and performance:

Industrial Ethernet switches are generally designed to meet industrial design: industrial wide temperature design, 3-level electromagnetic compatibility design, redundant AC and DC power input, and PCB board generally do “three-proof” processing. The environment of the industrial site is worse than the ordinary environment. At least the vibration, humidity and temperature are worse than the ordinary environment. The ordinary switch is not designed to withstand the various situations that occur in the industrial environment. The ordinary switch cannot be long. Time work in such a harsh environment, often prone to failures, and increase maintenance costs. It is generally not recommended to use commercial switches in industrial environments. In order to enable switches to be used in such harsh environments, production can adapt to this. Environmental switches, industrial-grade switches have power failures, port interruptions, relay output alarms, redundant dual DC power inputs, active circuit protection, overvoltage, undervoltage automatic disconnect protection.

(1) Function: Industrial Ethernet switches are closer to industrial network communication, such as interconnection of various fieldbuses, redundancy of equipment, and real-time requirements of equipment.

(2) Performance: It is mainly reflected in the different parameters applicable to the external environment. In addition to the particularly harsh environment, the industrial environment requires EMI electromagnetic compatibility, temperature, humidity, dust prevention, etc., especially the influence of temperature on industrial network equipment. It is the most extensive.

Industrial Ethernet Switch Application Area:

The industrial Ethernet switch market is mainly used in power automation, factory automation, coal mine automation, rail transit, wind power wind power, etc., followed by metallurgy, petroleum and petrochemical, road traffic control automation, building automation control systems, oilfield control automation, hydropower station control automation, Computer room monitoring system, water monitoring, environmental monitoring and other industrial automation. Industrial Ethernet switches are used in some environmentally demanding industrial sites due to their high protection level (general IP40), strong electromagnetic compatibility (EMS level 4) and stable working performance, which provides a strong guarantee for industrial communication.