ProSoft Technology MVI94-DNP - Manual (Page 88)

Reference MVI94-DNP ♦ Flex I/O
User Manual DNP 3.0 Server over Ethernet Communication Module
Page 88 of 131 ProSoft Technology, Inc.
December 17, 2010
When the processor receives the block, it places the information in the module’s
binary input event queue. This information is then made available to the remote
DNP master unit on binary event object or class poll requests. The module
informs the processor that the event has been processed by generating a
response block with the following format:
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.
3 Sequence Counter This field contains the sequence counter of the last
successful block 9958 received.
4 to 7 Spare Not used
The Sequence Counter and the Event Count fields in the response block can be
utilized to insure that the module has processed the event. If the event buffer in
the module is full, the event is not processed and the processor should resend
the event to the module. If the module processes the event, the processor can
remove the event from its buffer.
PLC Analog Input Event Data (Block 9959)
This block is used by the processor to send analog input event data from the
processor to the module. This event is generated by the processor; not the
module, and only has validity when a slave device is emulated on the application
port. When the processor recognizes an analog input event, it constructs a
request block with the following format:
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 DNP Analog Input
Data point
This is the data point in the DNP analog input database
represented by the event.
2 Analog Input Value This is the new analog input value represented in the
event.
3 Month/Day Formatted: bits 0 to 4 = Day, bits 8 to 11 = Month. All
other bits are ignored.
4 Hour/Minute Formatted: bits 0 to 5 = Minutes, bits 8 to 12 = Hour. All
other bits are ignored.
5 Sec/Millisecond Formatted: bits 0 to 9 = Milliseconds, bits 10 to 15 =
Seconds.
6 Year This is the four digit year for the event (0-4095). Bits 12
and 13 can contain the class override values of 1 to 3.