Is it better to use Modbus TCP over network cables rather than Modbus RTU over twisted pair cables?
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The disadvantage of network cables is that their length cannot exceed 100 meters. But for communication within or between cabinets, is it possible for Modbus TCP over network cables to provide faster and more stable transmission of more signals compared to Modbus RTU over twisted pair cables?
Using Modbus TCP over network cables has certain advantages over using Modbus RTU over twisted pair cables. Firstly, using Modbus TCP for network cables enables higher communication speeds, as it relies on the TCP/IP protocol, which allows for faster data transmission. Secondly, since the network cables are connected directly, there is no need for converters or interface devices, making installation and use relatively simpler. Furthermore, using Modbus TCP for the network cable allows support for more nodes, making system expansion easier. However, using Modbus TCP over network cables also has disadvantages, mainly the distance limitation, which cannot exceed 100 meters. For communication within or between cabinets, using Modbus TCP over network cables is a good choice, as it offers more stable and faster transmission over these distances, and it supports more signals. However, if the communication distance exceeds 100 meters, using twisted pair for Modbus RTU might be a better choice, as twisted pair can support longer distances. Therefore, it is important to choose the appropriate communication method based on the specific communication distance and requirements. .
MODBUS TCP has a faster transmission speed than Modbus RTU, and fiber optics can be used for long-distance transmission with MODBUS TCP.