PROGRAMMABLE CONTROLLER

摘要

An instruction decoding unit judges based on the immediately previous state of the contact of a sequence program stored in an electrical connection/disconnection information storage unit whether or not the conditions for execution of an instruction decoded by the instruction decoding unit are fulfilled. If the conditions are judged to be fulfilled, a data memory control unit reads calculation data from a data memory or a sequence program memory and controls the write of the results of the calculation by a calculating unit after the calculation in the data memory; if the conditions are judged to be fulfilled, the data memory control unit makes a control not to read/write the calculation data between the data memory and the calculating unit and shifts the control to the next instruction without performing calculation.