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MVI69-AFC ♦ CompactLogix Platform
Gas and Liquid Flow Computer
Reference
User Manual
6.8.2 Event Log Structures
The Event Log header contains housekeeping information for maintaining the
Log. Its layout is:
Address
Description
40000
Number of records maximum ( = 1999 )
40001
Next new record position ( 0 thru maximum -1 )
40002
Next new event number ( 0 thru 65535, wrapping to 0 )
40003
Oldest event number on file
40004
Oldest event number on file not yet downloaded
40005 to 40007
[reserved]
Each event record is an 8-register quantity laid out as four 32-bit items (bigendian):
Registers
Contents
0 to 1
Event Id Tag (page 180)
2 to 3
Timestamp of event
In our standard "packed bit-field" format.
4 to 5
Old item value
For a Datum Point event, format depends on the "datum type" field of the
Event Id Tag.
6 to 7
New item value
For a Datum Point event, format depends on the "datum type" field of the
Event Id Tag.
Each value is right-justified in its field and sign-extended if necessary.
ProSoft Technology, Inc.
June 24, 2015
Page 179 of 211