Differences between PLC, DCS, and RTU
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Essentially, there is no fundamental difference between RTUs, PLCs, and DCSs these days. The main difference lies in the application scenarios: RTUs are primarily used in outdoor environments with harsh conditions, where data collection and communication are of key importance, and their computing power is not very high. Many RTUs these days are programmable PLCs that operate primarily in discrete control applications, with an emphasis on speed. DCSs are mainly used for process control; in fact, many PLCs can also perform their basic functions. However, when the values of the parameters to be controlled are unknown, the advantages of DCSs become apparent, as ordinary PLCs lack the capabilities for advanced control and decoupling operations
The essential difference lies in the operation mode of the controller and the implementation of the integrated system database.