| 摘要 |
PURPOSE:To attain ease of maintenance by transmitting automatically a dead word data when no signal comes from a digital input section in a cyclic digital information transmission (CDT). CONSTITUTION:Data of input sections 1-8 are obtained by scanning sequentially a scanning device 9 by an output of a word counter 12'. An FF13 gives logical 1 to an AND gate 14 when no data of the input section exists and gives logical 1 to an AND gate 15 when the data exists. The scanned input data is transmitted via the AND gate 15, the AND gate 14 and a P/S converter 10. When no input data exists, a dead word from a dead word memory 11 is transmitted automatcally via the AND gate 14, an OR gate 16 and the P/S converter 10. |
