ProSoft Technology MVI94-DNP - Manual (Page 89)

MVI94-DNP ♦ Flex I/O Reference
DNP 3.0 Server over Ethernet Communication Module User Manual
ProSoft Technology, Inc. Page 89 of 131
December 17, 2010
When the processor receives the block, it places the information in the module’s
analog input event queue. This information is then made available to the remote
DNP master unit on analog event object or class poll requests. The module
informs the processor that the event has been processed by generating a
response block with the following format:
Word Offset in
Block Data Field(s) Description
0 Block ID Identification code for block set to 9959.
1 Block ID Block identification code for request from PLC by the
module.
2 Event Count This field contains the number of events processed by the
module.
3 DNP Analog Input
Data point This field contains the analog input point of the last
successful block 9959 received.
4 to 7 Spare Not used
The Sequence Counter and the Event Count fields in the response block can be
utilized to insure that the module has processed the event. If the event buffer in
the module is full, the event is not processed and the processor should resend
the event to the module. If the module processes the event, the processor can
remove the event from its buffer.