Reference MVI56-DNP
♦
ControlLogix Platform
User Manual
DNP 3.0 Server
Page 126 of 171
ProSoft Technology, Inc.
July 21, 2011
Up to 10 events can be passed from the ControlLogix processor to the module in
each block. To insure that the block reached the module and was processed, the
module will send a response read block 9959 to the ControlLogix processor.
Word Offset in
Block
Data Field(s)
Description
0 Reserved
Reserved(0)
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 Sequence
Counter
This field contains the sequence counter of the last
successful block 9959 received.
4 to 248
Spare
Not used
249
Block ID
Identification code for block set to 9959.
The sequence counter field in the returned block is set to the last successfully
processed block 9959 from the ControlLogix processor. Compare this value to
that sent by the ControlLogix processor. If the values match, the events can be
removed from the ControlLogix processor. If the values do not match, or the
ControlLogix processor does not receive a 9959 block, the ControlLogix
processor must re-send the block.
