| 摘要 |
PURPOSE:To make an automatic changeover between a common-use memory and memory stored with new data by transmitting information on changeover assignment time and new data from a switching center station to several subordinate stations and by detecting them by timers in subordinate stations. CONSTITUTION:New data, sent out from center station 11 to subordinate stations 10 via switching unit 12, are written in standby memory 5 via data receiving write unit 6. Next, changeover time information is sent out to subordinate station 10 and stored in changeover-time memory 7. When the time indicated by timer 9 agrees with that stored in memory 7, the output of comparative coincidence detection circuit 8 is grounded to operate relay X. This contact (x) allows common-use memory 4 connected to processor 1 to switch to standby memory 5 stored with new data. In subordinate stations 10' and 10'', the same operations are performed. |
