APARIAN A-DNP3R, Руководство пользователя

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DNP3 Operation
Document No. D109-010 Page 71 of 108
Revision 1.15
5.4. DNP3 EVENTS – UNSOLICITED RESPONSES
Events are generated in the Outstation and processed by the Master. Events can be grouped
during the unloading process by either their assigned class or Data Type Group (e.g. Group 23
– Analog). Unloading can be initiated by the Master via a set interval poll or initiated by the
Outstation via an Unsolicited Response message. The DNP3 Master controls each Outstation’s
ability to send Unsolicited Messages.
Unsolicited Events can be used to reduce network traffic by reducing or turning off polled
data exchanges. This method is referred to as Report-By-Exception.
In Scheduled (Master) Mode, DNP3 events are passed directly to an event array in the Logix
Controller. In the event that the DNP3 Module, in Master mode, loses connectivity to the
Logix controller, received Events will not be marked as received and therefore will be stored
in the outstation. Events do not need to be stored in the module in Scheduled Mode.
5.4.1. O
UTSTATION
E
VENT
C
ONFIGURATION
The configuration required from the DNP3 Router’s perspective is the following:
5.4.1.1. ENABLING EVENTS
Enable events for each mapped item in the Outstation Mapping. This will enable the DNP3
Router to start reading each Logix item at an interval of 10ms to determine if there has been
either a change in the status flags or if the value has changed by more than the deadband.
Figure 5.11 – Enable Events