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ProSoft Technology PTQ-AFC User Manual

Page 231

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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

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