| 摘要 |
PURPOSE:To grasp speedily and easily the current control state and control states before and after it by displaying a control sequence in a two-dimensional diagram, and inverting the black-and-white relation of parts in the diagram before and after the current time. CONSTITUTION:When actual control operation is performed, the control sequence is specified on a keyboard 3 firstly. An MPU1 reads data on this control sequence out of a data memory 4 to generate and display the pattern, etc., of the control sequence on a diagram display device 6, and then displays the completion of preparations on the device 6. The MPU1 after starting the actual control operation sets data corresponding to an elapsed time up to now, i.e. a column address corresponding to the current time on the time axis on the screen in a latch circuit 16 at specific intervals of time. Then, the output of a comparing circuit 14 is in an on state while the column address indicated by a column address signal outputted from a counter 12 is smaller than said column address, and a black/white inverting circuit 22 performs black/white inversion. |
