| 摘要 |
<p>Data bases of primary and secondary slave IOPs are synchronized by transmitting a message addressed to the first IOP by the master controller, receipt being acknowledged. The second IOP eavesdrops on the transmissions between the master controller and any of the IOPs on the network. Upon recognizing the message addressed to the first IOP and that the message is of a predetermined type, the second IOP receives the message for subsequent execution, verifies the message number in the acknowledge message,and completes execution of the received message, resulting in an update of the respective data bases. <IMAGE></p> |
