| 摘要 |
<p>PROBLEM TO BE SOLVED: To securely detect only an error and to remarkably improve the stability and reliability of error detection. SOLUTION: A time margin (machine margin) with respect to whole regular processing time T in a processor, a ticket issuing machine 20, for example, is previously set to be a reference value (t), and a monitoring range with respect to the processing part 21 of an initial stage is set to be T1±t based on the reference value (t). The monitoring range with respect to arbitrary processing parts 22, 23... in the processing parts 22... of second and subsequent stages is set to T2±(t-t1) and T3±t-(t1+t2)} based on correction values t-t1 and t-(t1+t2)... obtained by subtracting the integrated value of just enough time t1, t2... with respect to the respective regular processing times T1, T2... in the whole processing parts on this side from the arbitrary processing parts 22, 23... from the reference value (t).</p> |
