DCS is the abbreviation of Distributed Control System, which is also called distributed control system in domestic automatic control industry. Compared with centralized control system, it is a new computer control system, which is developed and evolved on the basis of centralized control system.
Programmable logic controller (PLC) uses a programmable memory for storing programs, executing user-oriented instructions such as logical operation, sequence control, timing, counting and arithmetic operation, and controlling various types of machinery or production processes through digital or analog input/output.