The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2013
Filed:
Jun. 28, 2010
Akihiro Amagai, Tokyo, JP;
Akihiro Amagai, Tokyo, JP;
Sanritz Automation Co., Ltd., , JP;
Abstract
The object of the present invention is to provide a synchronization method that enables more accurate synchronization on a clock included in each I/O node, in a node that forms a remote I/O system where a master node and I/O nodes communicate each other. The master node includes a clocking meansfor indicating the current time; a beacon recognizing means for detecting a reception of a beacon that is sent from a wireless LAN access point; a time detecting meansfor determining a time stamp indicating when the reception of the beacon is detected based on the time indicated by the clocking means; a master list generating meansfor generating a master list that is a list of the time stamp; and a master list sending means for sending the master list to the I/O nodesthrough the wireless LAN access point, and the beacon contains a TSF timer value for identifying the beacon, and the master list contains the TSF timer value of the beacon corresponding to the time stamp indicating the time of the clocking means