The Alarm Network Service routes alarms and messages to the appropriate alarm queues using its two components: the Network Alarm Manager and the Network Alarm Client. To distribute the alarms to other nodes, the Network Alarm Manager on a SCADA server and Network Alarm Client on a View client establish communication using their control queues. The View client starts the process by sending a request for alarms to the Network Alarm Manager's control queue on the SCADA server. The server responds by sending an acknowledgment to the Network Alarm Client's control queue.
This process is called handshaking. Before iFIX can route alarms and messages over the network, handshaking must occur so that iFIX can synchronize the computers for network communication. Once the handshaking is complete, iFIX routes alarms and messages to the View client, as the following figure shows.
Alarm Queue Interaction
