|
<< Click to Display Table of Contents >>
ST-64: Load Profile Data Set |
B1 |
0 (zero) |
B2 |
64 |
B3 |
Not used, leave it in 0 (zero) |
B4 |
Not used, leave it in 0 (zero) |
|
|
Size |
Determined by the number of channels of a Load Profile |
NOTE |
This table requires a writing to the Start Read Tag, with an initial and final date and time interval, to command its data transfer in background. |
This Tag is presented as a list of N blocks, in which N is the number of data blocks read and determined between the time space between the initial date and time and the ending date and time written in the Start Read Tag. If there is no data, returns an empty list.
The structure of blocks of this list cannot be determined without knowing the number of channels of the Load Profile, so the size of the blocks is determined at run time during the reading of available data on other tables. The size of blocks (S) is determined by twice the number of channels (C) plus one, that is, S = 1 + (2 × C). For example, for 4 (four) channels the size of blocks is 9 (nine), that is, S = 1 + (2 × 4) → S = 1 + 8 → S = 9.
The disposition of elements of each one of these blocks is the following:
•Element 1: Common flags. For more information, please check Note 1
•Element 2: Value of Channel 1 (one) with an applied scale
•Element 3: Status of Channel 1 (one). For more information, please check Note 2
•Element 4: Value of Channel 2 (two) with an applied scale
•Element 5: Status of Channel 2 (two). For more information, please check Note 2
•...
•Element S - 1: Value of Channel (S ÷ 2) with an applied scale
•Element S: Status of Channel (S ÷ 2). For more information, please check Note 2
The timestamp of each Block Tag corresponds to the date and time of a demand interval.
To interpret common flags, users must map the element into bits as follows: •Bit 00: Effective daylight saving time during the interval •Bit 01: Power failed or restored during the interval •Bit 02: Clock reset forward during the interval •Bit 03: Clock reset backwards during the interval |
Interpretation for Channel statuses is the following: •0: No status •1: Overflow •2: Partial interval due to a common status •3: Long interval due to a common status •4: Ignored interval due to a common status •5: Interval contains data from test mode |
This is the longest to read in ANSI C12.18/21 communication, and the duration of transfer time may vary depending on the required time interval.
Users can identify each channel and their measured quantities by performing a reading from the Read Profile Channels Tag.