| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a field network system which certainly transmits information with a predetermined propagation delay for a control application of a field apparatus while permitting irregular propagation delay which is a characteristic of an IP network. <P>SOLUTION: The field network system is connected with at least two field apparatus devices which transceives control information through the IP network, and enables a real-time control application to cooperate and operate between these field apparatus devices. The field apparatus device which transmits the control information, has an abnormality detection unit which outputs a difference between a new prediction parameter and a control value with a prediction value by detecting abnormality, based on a difference of the prediction value of a prediction algorithm unit for the control value. The field apparatus device which receives the control information, creates the most highly accurate prediction value in a range creatable based on the already received prediction parameter the difference between the control value and the prediction value. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
