ProSoft Technology MVI56-104S - Manual (Page 131)

Reference MVI56-104S ♦ ControlLogix Platform
User Manual IEC 60870-5-104 Server Communication Module
ProSoft Technology, Inc.
Page 131 of 188
November 18, 2009
When closing the connection, the module can be configured to clear all the
messages in its queue. The following parameter is used to implement this task:
The configuration above would cause to module to delete all pending
messages/events while closing the connection to the client.
5.2.5 Events
In order to improve communication efficiency, most applications will require the
client to periodically poll for data changes with a higher priority than polling for
monitor data. Every time a data changes, the server sends this information,
typically with the date and time information on when it has occurred.
The module supports a buffer queue of 99 events per data type. When the queue
is full, the module will delete the older event in the queue if a new event is
received.