1. The Configuration Of Ethernet Devices Is More Flexible And Convenient
Multiple RS232 serial devices and computer communications are generally in the computer PCI slot through the serial card or through the USB serial port connected to the USB to serial hub to achieve the expansion of the RS232 serial port, each computer’s PCI slot or USB interface is a certain number of limitations, which makes the computer communication with the number of RS232 serial devices by the corresponding limitations. The RS485 bus, on the other hand, has a certain number of PCI slots or USB ports. While the RS485 bus, although simple wiring, load equipment, communication distance can reach 1200 metres, but its wiring must be used hand in hand daisy chain topology, in the RS485 bus to increase the number of devices need to be laid over the line or through the addition of 485 repeaters or 485 hubs to solve the wiring problem, and Ethernet is different, as long as there is a network information port place, you can As long as there is a network information port, you can directly connect the relevant Ethernet devices to the Ethernet, and there is basically no limit to the number of access devices.
2. Hot-swap Support
It is possible to configure the related devices while the system is working, without stopping the system. For example, if the computer needs to increase the number of serial cards to expand the number of RS232 serial ports, it is necessary to stop the computer and open the chassis to increase the number of serial cards, for the same reason, in the RS485 bus to add the corresponding 485 devices, you need to interrupt the line before you can add the corresponding device, and increase the corresponding Ethernet devices on the Ethernet, only need to be nearby the information port on the network cable can be connected, and then the information port Connecting the network cable can be, and then through the computer software configuration can work normally.
3. Simple To Use, Easy To Maintain In The Later Stage
Whether it is RS232 devices or RS485 bus communication is generally only with a single computer for communication, it is difficult to form a dual-server redundant hot backup system, while the Ethernet can be very easy to configure dual-server redundant hot backup system. By the same token, based on RS232 serial communication or based on RS485 bus communication, it can’t form a redundant link, and once a problem occurs, the whole system may collapse, especially the RS485 bus, a problem (such as a short circuit) in the RS485 bus, it is easy to lead to the whole system can’t be used, and it’s very difficult to find the failure point in the RS485 bus, and you need to go one by one to It is very difficult to find the failure point on RS485 bus, and it needs to be investigated one by one. And based on industrial Ethernet as a means of communication can avoid similar problems, the use of industrial Ethernet switches to lay out the ring redundant links of industrial networks, once a link problem, can be self-healing within 20ms to restore and timely alerts prompted the maintenance.
4. High Scalability And Expandability, Very Adaptable To Flexible Cabling
Ethernet devices using hot-swappable work and configuration flexibility and convenience, the use of Ethernet as a means of communication can be no distance and the number of limitations, RS485 bus communication distance of 1200 m, can be increased by 485 repeaters or through the optical fibre modem converted to optical signals through the optical fiber transmission so as to achieve the role of extending the communication distance, but the transmission distance is always a certain limit, and the Ethernet can be connected to the Internet, through the Ethernet can be connected to the Internet, and the Ethernet can be connected to the Internet. Through the Ethernet can be connected to the Internet, through the Internet can be in any part of the world where there is a network connection for data exchange, similarly, RS485 bus long-distance communication at a maximum rate of 110Kbps, and now Fast Ethernet (100M) has been basically popularised, Gigabit Ethernet is gradually entering the field of industrial control, so the communication capacity of the Ethernet and the number of devices communicating on Ethernet basically has no limitation. Therefore, there is basically no limit to the communication capacity of Ethernet and the number of devices that can communicate over Ethernet.
With the deepening of industrial control automation and office automation, the goal of “control integration” in the industrial control field has been proposed, which means that the industrial control system and the office automation system can be closely integrated, and the industrial control system and the office automation system can be closely integrated. Office automation system can be closely integrated, information interchangeability to achieve seamless docking. As the office system is now based on Ethernet for data exchange, all the software is based on Ethernet operation, and Ethernet device communication without any modification, you can directly communicate with it, can quickly integrate the data related to Ethernet devices in the industrial control network into the office automation system.
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