ProSoft Technology MVI71-DNP - Manual (Page 86)

MVI71-DNP ♦ PLC Platform Reference
DNP 3.0 Master/Slave Communication Module
Page 86 of 172 ProSoft Technology, Inc.
August 23, 2007
Word Offset in Block Data Field(s) Description
5 Hour/Minute Formatted: bits 0 to 5 = Minutes, bits 8 to 12 = Hour.
All other bits are ignored.
6 Sec/Millisecond Formatted: bits 0 to 9 = Milliseconds, bits 10 to 15 =
Seconds.
7 Year This is the four digit year for the event.
8 to 12 Five words of data for Event #2.
13 to 17 Five words of data for Event #3.
18 to 22 Five words of data for Event #4.
23 to 27 Five words of data for Event #5.
28 to 32 Five words of data for Event #6.
33 to 37 Five words of data for Event #7.
38 to 42 Five words of data for Event #8.
43 to 47 Five words of data for Event #9.
48 to 52 Five words of data for Event #10.
53 to 57 Five words of data for Event #11.
58 to 62 Five words of data for Event #12.
63 Spare Not Used
Up to 12 events can be passed from the PLC to the module in each block. To
ensure that the block reached the module and was processed, the module will
send a response read block 9958 to the PLC. The format of the block is shown in
the following table.
Word Offset in Block Data Field(s) Description
0 Block ID Identification code for block set to 9958.
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.
Sequence This field contains the sequence counter of 3
Counter the last successful block 9958 received.
4 to 63 Spare Not used
The sequence counter field in the returned block is set to the last successfully
processed block 9958 from the PLC. Compare this value to that sent by the PLC.
If the values match, the events can be removed from the PLC. If the values do
not match, or the PLC does not receive a 9958 block, the PLC must re-send the
block.
Block 9959 or 259 – PLC Analog Input Event
If the PLC sends a block 9959, the module will place the analog input event data
in the block into the event buffer and alter the data values for the points in the
DNP analog input database. The format for the event message is shown in the
following table.