Industrial Ethernet networking equipment briefly
2016/7/1 view:
Today's control system and factory automation system, the application of Ethernet has almost as commonplace and PLC.But the site engineers understanding of Ethernet, mostly from their knowledge of traditional commercial Ethernet.A lot of the implementation of the control system engineering and even let IT department technical personnel to carry out directly.Understand IT engineers for Ethernet, however, are often limited to office automation business Ethernet implementation experience, can lead to industrial Ethernet in industrial control systems and simplicity of implementation of commercialization, can't really understand the significance of industrial Ethernet in the industrial field, also can't really use industrial Ethernet inner special functions, often cause not applied on the industrial Ethernet field thoroughly, unstable factors on the whole control system.
Then select the correct industry Ethernet to consider what factors?Simple, from the Ethernet communication protocol, power supply, communication rate, industrial environmental certification, installation, shell's influence on the heat dissipation, easy communication and communication management functions, electricity or light mouth to consider.These are the most basic need to understand the product selection factors.If the industrial Ethernet network management have higher requirements, need to consider to choose products by advanced features such as: signal strength, port Settings, error alarm, a serial port to use, the trunk (TrunkingTM) redundancy, redundant ring network, quality of service (QoS), virtual local area network (VLAN), simple network management protocol (SNMP), ports, mirror and so on other can provide functions of the management of industrial Ethernet switches.Different control system to the network management function requirements, natural use of managed switches also have different requirements.Control engineers should according to its system design requirements, choose to suit his system of industrial Ethernet products.
Due to the industrial environment high requirements for industrial control network reliability, industrial Ethernet redundancy function arises at the historic moment.From fast-growing spanning tree redundancy (RSTP), ring network redundancy (RapidRingTM) to backbone redundancy (TrunkingTM), have different advantages and characteristics, control engineers can choose according to their requirements.In order to better help you to understand and study the characteristics of industrial Ethernet redundancy technology, let's review the following the development of the Ethernet device.
A Hub (Hub)
Believe that the vast majority of people are familiar with hub.Many people use this simple device to connect all equipment based on Ethernet, such as personal computer, PLC, etc.Hub to receive messages from a port, then the message broadcast to all the other ports.From any port of each message, each hub will pass it to other ports.In terms of messaging, hub is slow and inefficient, message conflicts may occur.However, the use of a hub is very simple - in fact can plug and play.Hubs without any fancy function, also does not have redundant functions.
The managed Switch (fsound_unmanaged Switch)
The development of hub produced a call managed switch equipment.It can realize the message from one port to another port of routing, relatively hub more intelligent.The managed switch can automatically detect the network speed of each network device.In addition, it has a known as the "MAC address table" function, and can identify and memory in the network equipment.In other words, if the port 2 received a message with a specific identification number, then switches will all have the kind of message is sent to the port 2 specific identification number.The smart to avoid the conflict news, improve the transmission performance, relative to a hub is a huge improvement.However, managed switches are not implement any form of communication and redundant configuration function.
Managed switches (Managed Switch)
Ethernet connection equipment in the development of the next generation products are managed switches.Relative hub and non managed switches, managed switches have more complex functions, price is also much more - usually a non managed 3 ~ 4 times of switches.Managed switch provides more functionality, usually can be realized through a web-based interface configuration completely.It can automatic interaction and network equipment, the user can also manually configure each port speed and flow control.Some old equipment may not be able to use automatic interaction function, so the manual configuration is indispensable to the function.
Most often managed switches also offers some advanced features, such as used for remote monitoring and configuration of the SNMP (simple network management protocol (SNMP), used to diagnose the port mapping, for network equipment group of VLAN (virtual local area network), to ensure that priority message through the priority of the arrangement functions, etc.Using a managed switch, can form a redundant network.Using a ring topology, managed switches can form a ring network.Each managed switch can automatically determine the optimal transmission path and backup path, to be interrupted when the preferred path automatic block (block) backup path.
(sinosam finishing editing)
Then select the correct industry Ethernet to consider what factors?Simple, from the Ethernet communication protocol, power supply, communication rate, industrial environmental certification, installation, shell's influence on the heat dissipation, easy communication and communication management functions, electricity or light mouth to consider.These are the most basic need to understand the product selection factors.If the industrial Ethernet network management have higher requirements, need to consider to choose products by advanced features such as: signal strength, port Settings, error alarm, a serial port to use, the trunk (TrunkingTM) redundancy, redundant ring network, quality of service (QoS), virtual local area network (VLAN), simple network management protocol (SNMP), ports, mirror and so on other can provide functions of the management of industrial Ethernet switches.Different control system to the network management function requirements, natural use of managed switches also have different requirements.Control engineers should according to its system design requirements, choose to suit his system of industrial Ethernet products.
Due to the industrial environment high requirements for industrial control network reliability, industrial Ethernet redundancy function arises at the historic moment.From fast-growing spanning tree redundancy (RSTP), ring network redundancy (RapidRingTM) to backbone redundancy (TrunkingTM), have different advantages and characteristics, control engineers can choose according to their requirements.In order to better help you to understand and study the characteristics of industrial Ethernet redundancy technology, let's review the following the development of the Ethernet device.
A Hub (Hub)
Believe that the vast majority of people are familiar with hub.Many people use this simple device to connect all equipment based on Ethernet, such as personal computer, PLC, etc.Hub to receive messages from a port, then the message broadcast to all the other ports.From any port of each message, each hub will pass it to other ports.In terms of messaging, hub is slow and inefficient, message conflicts may occur.However, the use of a hub is very simple - in fact can plug and play.Hubs without any fancy function, also does not have redundant functions.
The managed Switch (fsound_unmanaged Switch)
The development of hub produced a call managed switch equipment.It can realize the message from one port to another port of routing, relatively hub more intelligent.The managed switch can automatically detect the network speed of each network device.In addition, it has a known as the "MAC address table" function, and can identify and memory in the network equipment.In other words, if the port 2 received a message with a specific identification number, then switches will all have the kind of message is sent to the port 2 specific identification number.The smart to avoid the conflict news, improve the transmission performance, relative to a hub is a huge improvement.However, managed switches are not implement any form of communication and redundant configuration function.
Managed switches (Managed Switch)
Ethernet connection equipment in the development of the next generation products are managed switches.Relative hub and non managed switches, managed switches have more complex functions, price is also much more - usually a non managed 3 ~ 4 times of switches.Managed switch provides more functionality, usually can be realized through a web-based interface configuration completely.It can automatic interaction and network equipment, the user can also manually configure each port speed and flow control.Some old equipment may not be able to use automatic interaction function, so the manual configuration is indispensable to the function.
Most often managed switches also offers some advanced features, such as used for remote monitoring and configuration of the SNMP (simple network management protocol (SNMP), used to diagnose the port mapping, for network equipment group of VLAN (virtual local area network), to ensure that priority message through the priority of the arrangement functions, etc.Using a managed switch, can form a redundant network.Using a ring topology, managed switches can form a ring network.Each managed switch can automatically determine the optimal transmission path and backup path, to be interrupted when the preferred path automatic block (block) backup path.
(sinosam finishing editing)
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