| 摘要 |
PURPOSE:To execute the monitoring processing with high reliability by a few communication messages by constituting a ring of a superordinate and a subordinate node addresses, monitoring a message from the superordinate node processor by each processor, and also, monitoring the message by the subordinate node processor. CONSTITUTION:Each processor 1 - 4 is provided with a superordinate node address and a subordinate node address, respectively, and a monitoring processing ring of the processors 1 - 4 is constituted. The A node processor 1 transmits a message for showing a fact that a normal processing is being executed at every prescribed time to the subordinate B node processor 2 designated by the subordinate node address, and also, monitors a message transmitted from the superordinate D node processor 4 designated by the superordinate node address. In the same way, the B node processor 2, the C node processor 3, and the D node processor also monitor a message transmitted from the superordinate node processor designated by the respectively superordinate node addresses. In such a way, the monitoring processing can be executed with high reliability by a few communication messages. |
