Reference MVI56-DNP
♦
ControlLogix Platform
User Manual
DNP 3.0 Server
Page 122 of 171
ProSoft Technology, Inc.
July 21, 2011
Using the data in this block, the module responds with a read block 9949 with the
following format:
Word Offset in
Block
Data Field(s)
Description
0 Reserved
Reserved
(0)
1
Block ID
This is the next block requested by the module.
2 Slave
Count
This field contains the number of slave records contained in
the block that must be processed by the PLC. This field will
have a value of 1 to 30.
3
Slave Start Index
This field contains the index in the slave array for the first
record in the file. This field will have a value of 0 to
MaxSlaves-1.
4 to 11
Slave Data #1
This is the slave data for the first slave in the block. The
slave index for the data is the Slave Start Index given in
word 3.
12 to 19
Slave Data #2
This is the slave data for the second slave in the block.
20 to 27
Slave Data #3
This is the slave data for the third slave in the block.
236 to 243
Slave Data #30
Last slave requested.
244 to 248
Spare
Not Used
249 Block
ID This field contains the value of 9949 identifying the block
type to the PLC.
The 8-word data area for each slave is that shown in the table above. You can
sequentially read through the list of all IED units up to 30 at a time to retrieve all
the error information. This data can be transferred to the module's controller tag
in the processors ladder logic.
