What are the three layers of the network structure of Hollysys DCS - DCS?
The bottom layer, the field control layer, that is, the field instrument and signal transmission, is mainly the collection of signals and the transmission of control signals. From field devices to control CPUs.
The middle layer, the system management layer, that is, the internal network layer of the DCS system, including the control station, the operation station, the historical server...
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