부산대학교 도서관

A sequence program formed by a plurality of contacts or windings each given an actual address representing a name of a mechanism such as a truck, a lifter, a slide or the like which forms a system to be controlled and the action of which is to be controlled to control the system, a name of an action of the mechanism and a name of a controlled device such as a switch, a solenoid valve, a motor and the like which is directly controlled to control the action of the mechanism is prepared. A first transitional sequence program in which each contact or winding is given a variable label is created by designating or selecting standardized control circuits corresponding to the desired actions of the mechanisms forming the system to be controlled, and a second transitional sequence program in which each contact or winding is given a fixed label is created by designating the names of the mechanisms and the actions thereof, and a sequence program in which each contact or winding is given an actual address is created on the basis of a table representing correspondence between the fixed labels and the actual addresses.