ProSoft Technology PTQ-104C - Manual (Page 113)

49TPTQ-104C ♦ 48TQuantum Platform Reference
47TIEC 60870-5-104 Client
12TUser Manual
9.2.3 Events
The event pass-through functionality must be initially enabled by the user in PCB.
The ‘Pass-Through Events’ parameter will need to be set to ‘Yes’ in the [Module]
section.
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
other monitored data. Every time a data point changes, the server can send this
information as an event, typically with date and time information indicating when
the change occurred.
The following illustration shows the basic idea of the event pass-through
functionality. When the module receives the event from the remote device, it will
build block 9903, which will be copied to the processor at the configured memory
address:
The module supports a buffer queue of 99 events per data type. When the queue
is full, the module will delete the oldest event in the queue, replacing it with the
newest event received for that data type.
ProSoft Technology, Inc. Page 113 of 136
March 4, 2013