SEQUENCE CONTROLLER

PURPOSE:To improve efficiency and operability, by referring to the content of the flag of a conditional flag element group provided corresponding to a conditional element group in which an application data base is described when it is interpreted. CONSTITUTION:The application data base 1 is constituted of n-number of decision tables 11-1n, and each decision table has the description 101 of the conditional element group, and the description 102 of an execution element group. The content of an operating object such as the contact of a process field, etc., is reflected on the conditional element group 2. The conditional flag element group 4 is provided corresponding to the conditional element group 2, and each element has a flag function to request bypassing. An interpretation execution function 6, when a condition described in the application data base is satisfied, refers to the content of the flag of the conditional flag element corresponding to the condition, and executes a prescribed operation via an execution element.