METHOD FOR CONTROLLING SEQUENCE

摘要

PURPOSE: A method for controlling sequence is provided to improve the suitability by allowing each step of an SFC(Sequence Flow Control) to control the whole flow without using a separate scheduler. CONSTITUTION: A step of an SFC is made as an independent task which is multi-processed by a multiprocessing operating system(300). The task comprises a routine for receiving a token, a routine for performing a transition according to an input transient condition, a routine for performing a corresponding internal step operation, and a routine for transferring a token to a task corresponding to an output transient condition. Input/output transient information of each step and input/output step information of each transition are set(310). A task generated according to the input/output transient information and the input/output step information is performed(320).