Advanced control station and distributed processing control unit interface implementation method

The invention discloses a method for accessing an advanced control station algorithm to an algorithm switching interface of a distributed processor unit. The method comprises the steps: communication diagnosis, algorithm switching and undisturbed switching of an output instruction of an advanced control station and the distributed processing control unit; the advanced control station executes corresponding protection measures when a fault occurs, and system data synchronization is ensured after communication is recovered; under the normal communication condition, in the DCS system control process, an advanced control station system tracks a process value, a set value and an output instruction of a DCS control loop, when the algorithm is switched to advanced control station control, the advanced control station continues to calculate and carry out output adjustment according to a previous control instruction, and a DCS algorithm tracks the instruction of the advanced control station, and the undisturbed switch