| 摘要 |
PURPOSE:To monitor the working of a program by activating a signal device at the 1st check point and inactivating the signal device at the 2nd check point when the program has its normal working. CONSTITUTION:A lamp is switched on and off repetitively in a cycle T1 while programs A and B have normal working. While the lamp is kept ON or OFF in case both programs have no normal working. |
