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102 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 6 Micro870 Controller Distributed Network Protocol
Data-Set Descriptors Configuration Parameters
These parameters are used to construct Data-Set Descriptors objects.
The Read and Enable Event allows assignment of characteristics to the Descriptor.
• Read – set if Data-Set is readable.
• Enable Event – set if outstation generates a Data-Set event.
Event Class – With the Enable Event checked, the event class is displayed to allow assignment
of Event Class to this Descriptor.
• 1 – Class 1
• 2 – Class 2
• 3 – Class 3
Trigger Event: Define and set this parameter to generate an event by the ladder logic to
generate timed events. Once this parameter is set by the ladder logic or communications, the
controller clears it automatically after generating an event at the end of scan.
Disable Change Event: Define and set this parameter to suppress the events generated by any
Event Occurrence Condition.
Event Occurrence Condition: The conditions of Data-Set Event for each Data-Set Descriptor
can be configured by Data-Set Event Occurrence Condition 1/2/3/4 in the DNP3 Data-Set
Descriptors Object. When one of the values that are pointing to the Event Occurrence
Condition 1/2/3/4 are changed or the criteria are met, the controller generates a Data-Set
Event, retrievable using the object Group 88, Variation 1.
The following table shows the supported conditions for Point Addressing under Event
Occurrence Conditions.
Note that a Data-set event can consume any number of event buffers, depending on the Data-
set configuration. This is only applicable for Data-set events. The event for other objects
consumes a single event buffer. When using Data-set events, increase the number of events in
the DNP3 Slave configuration.
Point Address Type Point Type Point Index Event Occurrence Condition
Empty NONE: No point type is associated. 0 No Event is generated.
Standard DNP3 Point
BI: Binary input 0…4095
When the Point Type and Point
Index are pointing a specific point,
if the value of the point is
changed, an event is generated.
B2I: Double-bit input 0…2047
CI: Counter 0…511
AI: Analog input 0…767
BCD: BCD point 0…255
Variable Select the tag from the controller. 0
Event is generated based on the
condition of the variable tag
selected.