ProSoft Technology MVI56-104S - Manual (Page 73)

Ladder Logic MVI56-104S ♦ ControlLogix Platform
User Manual IEC 60870-5-104 Server Communication Module
ProSoft Technology, Inc.
Page 73 of 188
November 18, 2009
The structure of each event record in the block is shown in the following table.
Word Offset in Event
Record Data Field(s) Description
0 DB Index This is the index for the point in the module's database.
This corresponds to the order of point definition for the
module data types. This is not the point address for the
event. For example, to refer to the third configured point,
enter a value of 2 (first event is 0).
1 ASDU This is the ASDU data type for the event message. Valid
entries for this field are as follows:
1=single-point
3=double-point
5=step
9=normalized
11=scaled
13 = short floating point
15=integrated total
2 Qualifier This is the qualifier code for the event message. This
parameter is only used for ASDU types 5, 9, 11 and 15.
Refer to the IEC Protocol Specification for a full listing of
valid qualifier codes for one of these ASDU types.
3 Year The value in this word should always be set to FFFFhex
(-1 decimal) to indicate this block is a UTC time-
formatted block.
4 through 7 UTC Time UTC time is a 64-bit counter in microseconds since
January 1, 1972 in little endian byte order, as used in the
ControlLogix processor. This time value is converted in
the module to produce a valid IEC 60870-5-104 time
value, which can be sent to remote Clients.
8 Reserved Reserved
9 through 14 Data These words contain the data for the event. For single-
and double-point, step, and measured value events, the
first word is used. For integrated total events, the first
two words are used.