Opal interconnection adopts AOPRE-LINK8248、AOPRE-LINK8280 in the solution of distributed monitoring system of power station.The field data access layer can map the field data information into the data information on the I / O bus of DCS through an interface conversion server on the I / O layer of DCS, so as to unify and integrate DCS control. The data communication layer adopts the redundant ring network information composed of the main control system 1#2 machine. The uplink is connected to the workstation, engineer station and server through opal Internet Gigabit Industrial Ethernet switch, and the downlink is connected to the control and management host station through Gigabit Ethernet switch aopre-link8280, so as to realize the redundant structure of the whole system and the reliability and stability of packaging data transmission.