The system and method in order to maintain the common sense of time on the network segment

摘要

The system (10) control center (12), the time master device (16), and the master clock of the time master device it is synchronized the time slave field device which plural is decentralized (18) it possesses. The time master device (16) time distribution data unit is transmitted periodically. Each time slave field device (18) timer adjustment element (32), the fixed rate clock (36), and the variable clock (34) it possesses. Timer adjustment element (32) frequency ratio with the master clock and the fixed rate clock is calculated, frequency ratio is used and adjustment factor is calculated, the local sense of time for each field device is adjusted, as a result, time stamp of each field device is synchronized the master clock.