| 摘要 |
PURPOSE:To increase the reliability and the speed of response, by sending the information groups successively in the order begining from the smallset allotted addressess in case a change of state occurs in the correlated information groups. CONSTITUTION:The plant state information is grouped into the related unit of information groups, and the state contact (c) that works last among these groups is connected to the gate 21a. The scan address preset register 20a that preset previously the address where the scan is started when a change of state occurs is connected to another gate 21. Thus the gate 21a opens only when a change of state occurs at the contact (c), and the contents of the register 20a is set at the data address counter circuit 8. |
