| 摘要 |
PURPOSE:To divide the state of a multi-point programmable controller for selective display by using a display changeover switch to select the first half and the latter half of the programmable controller. CONSTITUTION:A display device 9 for confirmation of actions of many points, e.g., 64 points, contains a latch circuit 4, a light emitting diode 7, an external device driving circuit 8 and a display device driving circuit 11 containing a display switch of buffers. When a switch 10 is set at the (a) side, buffers 11a-11n function as buffers to actuate light emitting diodes 7a-7n for display of 32 points of the first half as long as the outputs of those buffers are set at L. While 32 points of the latter half showing the states of outputs 4n+1-4m of the circuit 4 are displayed by the diodes 7a-7n when the outputs of buffers 11n+1-11m are set at L. Thus many points can be displayed selectively and in division. |
