| 摘要 |
PURPOSE:To increase the assuredness and the efficiency for a test, by adding a monostable multivibrator, a counter and an output circuit to the side of an input/output device plus a timer, a pulse counter and a display to the side of an input/output control system as the test circuits respectively. CONSTITUTION:A test instruction to be given to an input/output device resets a counter 7 by a multioutput SO and via a decoder 4 and a monostable multivibrator 6. The counter 7 starts counting when the SO pulse is discontinued. The time of discontinuation is unstable for the SO pulse owing to the variance of C and R, and the output period of the counter differs although the plural devices having the same input/output device number exist if the clock is set at a high speed. During the output of a test instruction, the carry output is turned into an answer signal to be applied to a counter in an input/output controlling system. For the timer of the input/output controlling system, a 1-period counter of the counter 7 counts the pulses after a test instruction is given and after the pulse supplied from an SO terminal is discontinued. This pulse number indicates the devices that have virtually the same input/output device number. |
