| 摘要 |
<p>PURPOSE:To execute an adequate processing in case when an abnormal state occurs, by stopping an operation of a device and resetting it to the state before its start, in case when a signal is not received within a set time of the first timing circuit and a synchronizing error is detected. CONSTITUTION:Whether both a slave device S and a master device M generate a data error at the time of reception or not is discriminated, and in case when a result of the decision is NO, a new operating signal OP is transmitted to the slave device S. In case when the result of the decision is YES, a state of an output signal ST of an OFF-delay timer 20 is checked, and in case when the signal concerned ST is not a logical level ''H'' (namely, the result of the decision is NO), the timer concerned 20 is started. Also, in case when the result of the decision is YES, a state that a data error occurs at the time of reception in both the slave device S and the master device M is generated two times in a short time when the timer 20 is operated, therefore, the processing is executed, it is displayed to an operator that the data error occurs, and the operation is stopped.</p> |
