ProSoft Technology MVI56E-DNPNET - Manual (Page 102)

Contents MVI56E-DNPNET ♦ ControlLogix Platform
User Manual DNPNET Ethernet Client/Server Communication Module
Page 102 of 140 ProSoft Technology, Inc.
February 13, 2015
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
Received
This field contains the number of events processed/received
by the module.
3 Sequence
Counter Received
This field contains the sequence counter of the last successful
block 9968 received. Used to synchronize and confirm receipt
of the block by the module.
4 to 248 Spare Not used
249 Block ID Identification code for block set to 9968.
The sequence counter field in the returned block is set to the last successfully processed
block 9968 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 9968 block, the
ControlLogix processor must re-send the block. This block is typically used to pass SOE
data from a 1756-"SOE" module to the DNP server event buffer of the MVI56E-DNPNET
module. Upon successful receipt of the data by the module, this data can then be cleared
from the event queue of the 1756-"SOE" modules.
Block 9969: Analog Input Event With CLX Processor Time
Block identification code 9969 sends a set of analog input events with the ControlLogix
processor time to the module. The following table lists the block format of Analog Input
Events Request sent to the module from the ControlLogix processor.
Word Offset
in Block Data Field(s) Description
0 Block ID This field contains the value of 9969 identifying the event block
to the module.
1 Event Count This field contains the number of events contained in the
block. Valid values for this field are 1 to 30.
2 Sequence
Counter
This field is used to hold the sequence counter for each 9969
block transfer. This is used to synchronize and confirm receipt
of the block by the module.
(Begin Event #1)
3 Point_Number This is the data point in the DNPNET analog input database
represented by the event.
4 Class_Override Regardless of the Class defined for the given point number,
this will be the Class of the event. Bits 0 and 1 are used for
class override values of 1, 2, or 3.
5 to 6 Value Value of the point. 16-bit int, 32-bit int or 32-bit float can be
packed into this space