ProSoft Technology MVI56E-DNPNET - Manual (Page 99)

MVI56E-DNPNET ♦ ControlLogix Platform Contents
DNPNET Ethernet Client/Server Communication Module User Manual
ProSoft Technology, Inc. Page 99 of 140
February 13, 2015
Word Offset
in Block Data Field(s) Description
233 to 242 Ten words of data for Event #24.
(End of Event
Data)
243 to 247 Spare Not used
Up to 24 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 9958 to the ControlLogix processor. The following table
describes the format of the block.
Word Offset
in Block Data Field(s) Description
0 Reserved Reserved
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. (1 to 24)
3 Sequence
Counter Received
Sequence counter received for each block transfer. Used to
synchronize and confirm receipt of the block by the module.
This field contains the sequence counter of the last successful
block 9958 received.
4 to 248 Spare Not used
249 Block ID Identification code for block set to 9958.
The sequence counter field in the returned block is set to the last successfully processed
block 9958 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 9958 block, the
ControlLogix processor must re-send the block.
Block 9959: Analog Input Event With Calendar Time
Block identification code 9959 sends a set of analog input events with calendar time to the
module. The following table lists the block format of Analog Input Events 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 9959 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 20.