ProSoft Technology PTQ-AFC - Manual (Page 231)

PTQ-AFC ♦ Modicon Quantum Platform Reference
Liquid and Gas Flow Computer for Hydrocarbon Products User Manual
ProSoft Technology, Inc. Page 231 of 259
June 23, 2011
11.6 Archive Data Format
There are 3 columns associated with each archive data:
Column Description
Ofs Shows the offset location of the data in each archive. The maximum offset value
will depend on the Record Size value you configured.
If the value has a "+" value (for example 0+) it means that the data occupies 2
words of data.
Reg Shows the Primary Modbus Slave Address of the data. This is a meter-relative
address. For example: a Reg value of 890+ for meter 1 would be equivalent to
Modbus addresses 8890 and 8891.
Description
Data Description.
11.6.1 Timestamp Date and Time Format
The date and time format used in the archives is stored in a highly compressed
form in order to represent the date and time using only 2 words of data:
Word Description
0 Date
1 Time
In order to extract the information from the date format use the following
arithmetic:
Date Word
Year = ([Bits 15 thru 9] from Word 0) + 1996
Month = ([Bits 8 thru 5] from Word 0) + 1
Day = ([Bits 4 thru 0] from Word 0) + 1
Time Word
Hour = ([Bits 15 thru 11] from Word 1)
Minute = ([Bits 10 thru 5] from Word 1)
Second = ([Bits 4 thru 0] from Word 1 )* 2
The first 10 words of data (archive header) are common for all archives:
11.6.2 Pre-defined Header
These archive areas are included in the default archive data, and cannot be
reconfigured by the user.
Start
Offset End
Offset Data Format Type Description
0 1 Timestamp Snapshot Closing timestamp of archive
2 Word Calculated Flowing period
3 Bitmap Calculated Cumulative meter alarms
4 Bitmap Calculated Cumulative status
5 Word Snapshot Event counter
6
7 Double word Calculated Flowing period, seconds
8 9 Timestamp snapshot Opening timestamp of archive