| 摘要 |
PURPOSE:To expand a simulation function by enabling a timer/counter function to be set and reset optieonally during on-line operation. CONSTITUTION:Every time one cycle of the execution of a user program ends, data in an input and output memory 8 are updated and timer/counter data in a timer/counter memory 9 are also updated. To simulate a timer/counter function, the timer/counter data in the timer/counter memory 9 are rewritten forcibly. With regard to the forcibly rewritten data in the timer/counter memory 9, the execution result of the user program by an instruction execution part 6 is disregarded and the forcibly rewritten data are held. Therefore, instruction executing operation is carried out on the basis of the rewritten data, so there is no contradiction of the user program. |
