Modbus's protocol content is completely open, the content is simple, it is very easy to implement, single-chip, plc, dcs can be easily realized
Profibus is more complicated. The key is to require a dedicated chip for secondary development, and it needs to be certified by the superior organization. The development cost is definitely higher.
Of course, in terms of performance, the modbusrtu/ASCII communication performance based on the serial port is definitely better than profibusdp, but modbus is sufficient for some instrument-level simple communication or controller-level small data communication.
To put it bluntly, modbus is * silk, profibus is Gao Fushuai
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