Process control station access system and access method

The invention discloses a process control station access system, which belongs to the technical field of electric power communication and comprises a first monitoring system, a second monitoring system and a plurality of control cabinets.Each of the plurality of control cabinets is internally provided with two groups of process control stations which are connected with each other; A data function unit for acquiring data and a service logic unit for processing the data are arranged in the process control station, the first monitoring system is directly connected with the data function unit, and an output device module is arranged between the second monitoring system and the data function unit. The service logic unit is used for receiving an instruction output value of the data function unit and generating a corresponding action, so that two different monitoring systems can simultaneously acquire process control station data of the distributed control system and simultaneously send a control instruction to the