| 摘要 |
<p>PURPOSE:To prevent the difference of time data caused when such data are used in the processing of each controller connected to the same on-line information bus by using the time data fetched via an on-line bus for execution of the processing requiring the time. CONSTITUTION:The controllers 2, 5 and 6 always set and fetch the processing data on a plant necessary for the monitoring control and also the time data which are periodically sent from a time control part 13 and flowing on an on-line information bus 9. Then a fact whether the time data are required or not when the relevant processing data are processed is discriminated. If so, each of controllers 2-6 does not use the time of its own internal clock and uses the time data fetched from the bus 9 together with the processing data to process the processing information. Then other processings that need no time data in particular are processed.</p> |
