Time synchronization in control systems or industrial process automation

摘要

Time synchronization method of a plurality of devices (2, 10, 20, 30) of an industrial process control or automation system interconnected through a communication network (1), in which a master clock device ( 2) distributes time synchronization messages that comprise a system reference time through a communications network to the slave devices (10, 20, 30), comprising - recording, by means of a system device, of a history of deviation between the system reference time and a local clock in the device, - deduction, by the device, of a deviation forecast based on the recorded deviation history, - calculation, by the device and after the interruption of the reference time of the system, of a reference time of the transitory system based on the local clock and the forecast of deviation and - distribution, by the device, of synchronization messages n of times that include the reference time of the transitional system to the other devices of the system, characterized in that the method comprises - the deduction of a first forecast of deviation according to a first prediction technique for a first duration of the interruption and a second deviation forecast according to a second prediction technique for a second interruption duration that exceeds the first interruption duration.