| 摘要 |
PURPOSE:To use a display section in common for the display section of normal and failure signals, by providing a switching means and a failure detecting means of a decoder and the 2nd decoder for failure signals. CONSTITUTION:If no failure signal is inputted to a failure signal input terminal E1, inputs to a gate 6 are all ''0'' and an output of the 2nd encoder 4 is not outputted from a gate group GA1. An output of an NOT circuit goes to ''1'' and data from the 1st encoder 3 are inputted to a display section 1 through gate groups GA and GO. Further, a failure display light EL is not illuminated. If the failure signal is inputted to the terminal E1, the output of the OR gate 6 goes to ''1'' and the data from the 1st encoder 3 are not outputted from the gate group GA1. The data corresponding to the failure signal from the 2nd encoder 4 are inputted to the display section 1 through the gate group GA2 and GO and the display section 1 displays the content of failure. Similarly, the failure light EL is illuminated. |
