PROGRAMMABLE CONTROLLER

摘要

A programmable controller which effects control in such a manner as executing a series of programs each constituted by a plurality of steps which are given respective step numbers for each of the predetermined control units. The controller has a step flag memory unit (4) constituted by a plurality of step flag memory means each provided with a function of storing the state of the unit step which is being executed. The controller checks the ON/OFF state of the flag corresponding to the contents at the step flag address in the program read out from a program memory unit (2) in time sharing. When the flag is ON, the controller controls a single or plurality of unit steps corresponding to the flag. Contents specifying a subsequent unit step are pre-programmed in the end of each of the unit steps, wereby it is possible to shift to any unit step as desired.