APPENDIX A: APPLICATION NOTES
DATA LOGGER IMPLEMENTATION
PQM POWER QUALITY METER – INSTRUCTION MANUAL
A–15
A.6 Data Logger Implementation
The Data Logger allows various user defined parameters to be continually recorded at a
user defined rate. The Data Logger uses 64 samples/cycle data. The PQM has allocated
65536 bytes of memory for Data Log storage. The memory structure is partitioned into 512
blocks containing 64
×
2 byte registers as shown below:
FIGURE A–2: Data Logger Memory Structure
Each entry into the Data Log is called a Record. The Record can vary in size depending
upon the parameters the user wishes to log. The memory structure can also be partitioned
into 2 separate Data Logs. The 2 logs can be user defined in size, or can be optimized by
EnerVista PQM Setup. The top of each Data Log contains what is called the Header. Each
Data Log Header contains the following information…
•
Log Time Interval
: This is the user defined interval at which the data log will store
entries
•
Present Log Time and Date
: This is the time and date of the most recent Record
•
Log Start Address
: This is the start address for the beginning of the logged data
•
Log Record Size
: This is the size of each Record entry into the Data Log based upon
the user defined Data Log structure
•
Log Total Records
: This is the total number of records available based upon the user
defined Data Log parameter structure
•
Log Pointer to First Item of First Record
: This is a pointer to the first record in the
Data Log
•
Log Pointer to First Item of Record After Last
: This is a pointer to the next record to
be written into the Data Log
•
Log Status
: This reports the current status of the Data Log; i.e.: Running or Stopped
•
Log Records Used
: This is the number of records that have been written into the Data
Log
REGISTER 1
BLOCK 0
BLOCK 1
BLOCK 510
BLOCK 2
BLOCK 511
REGISTER 1
REGISTER 1
REGISTER 1
REGISTER 1
REGISTER 2
REGISTER 2
REGISTER 2
REGISTER 2
REGISTER 2
REGISTER 64
REGISTER 64
REGISTER 64
REGISTER 64
REGISTER 64
Содержание Multilin PQM
Страница 3: ...Courtesy of NationalSwitchgear com ...
Страница 4: ...Courtesy of NationalSwitchgear com ...
Страница 10: ...TOC VI PQM POWER QUALITY METER INSTRUCTION MANUAL TABLE OF CONTENTS Courtesy of NationalSwitchgear com ...
Страница 348: ...I 10 PQM POWER QUALITY METER INSTRUCTION MANUAL INDEX Courtesy of NationalSwitchgear com ...