| 摘要 |
PURPOSE:To offer a trouble diagnosing system which is low in its cost and high in the reliability bt making the constitution that simulating input is impressed separately other than external input which usually comes in for checking whether output from a processer might be a specified value. CONSTITUTION:External input is transmitted as ON/OFF signals of a switch 2 through a contact 4 of a relay 3 and a comparator 8 to a multiplexer 9. The multiplexer 9 transmits external input in commensuration to address signals from a processer 200 through an input line DIN to the processer. A simulating input impressive circuit 400 is provided for diagnosing input circuit of such a system, registers 13-15 are set by writable command signals WSTB and writable data DAWA from the processer 200 when diagnosing. A comparator 8 is given total points ''1'' or ''0'' signals in proportion to the contents of these registers, the output is taken by the processer 200 for being checked. |
