| 摘要 |
<P>PROBLEM TO BE SOLVED: To more exactly perform synchronization of time in each I/O node in nodes constituting a remote I/O system. <P>SOLUTION: This time synchronization method in the remote I/O system has steps of: receiving identical beacons to extract TSF timer values included in them; generating a master list 31 in a master node 1; transmitting the master list 31 to an I/O node 2; generating a local list 41 in the I/O node 2; receiving the master list 31 in the I/O node 2; calculating an amount obtained by adding delay time difference for generating a time stamp after receiving the beacon of the I/O node 2 to the master node 1 to difference between the time stamp of the local list 41 and the time stamp in the master list 31 as an error amount; and adjusting a time count means 24 to the same time as that of the master node 1 based on the error amount. <P>COPYRIGHT: (C)2009,JPO&INPIT |
