Event Data Format
Each event time stamp entry is a 12 bytes block organized as follows:
|
Byte 0 |
||
|
Byte 1 |
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|
Bit 7...0 |
Byte 2 |
|
Bit 15...8 |
Byte 3 |
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|
|
Bit 7...0 |
Byte 4 |
Bit 15...8 |
Byte 5 |
||
Bit 23...16 |
Byte 6 |
||
Bit 31...24 |
Byte 7 |
||
|
Bit 7...0 |
Byte 8 |
|
Bit 15...8 |
Byte 9 |
||
Bit 23...16 |
Byte 10 |
||
|
Byte 11 |
||
Each parameter is detailed hereunder.
Value Parameter
Bit 0 defines the value of the variable after change detection:
0: Falling edge
1: Rising edge
Event ID Parameter
It represents the topological address of the
channel in a BMX ERT 1604
T module (with Event ID = 16
attributed to the SOE_UNCERTAIN) and
is provided by the variable management as a unique value for the BMX CRA 312 10 modules.
DateAndTime Parameter
Defines the date and time of the variable change detection.
The following table describes the DataAndTime parameter format:
Attribute Name |
Type |
Description/Value |
Position |
|---|---|---|---|
|
|
Number of seconds since midnight (00:00:00) 1970/01/01 (UTC time). (0...MAX) |
|
|
|
FRACT_SEC_0 (LSByte) |
B7-B0 |
FRACT_SEC_1 |
B15-B8 |
||
FRACT_SEC_2 (MSByte) |
B23-B16 (B23 = 1 for 1/2 s) |
||
The time format is defined according to IEC 61850-7-2 Edition 2.
Representation of the FractionOfSecond parameter structure:
FRACT_SEC_2 (MSByte) |
FRACT_SEC_1 (2nd byte) |
FRACT_SEC_0 (LSByte) |
|||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
23 |
22 |
21 |
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
10 |
9 |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
TimeQuality Parameter
The following table describes the TimeQuality parameter format:
Attribute Name |
Type |
Description/Value |
|---|---|---|
|
|
This bit is set to FALSE. |
|
|
Same meaning as I% (implicit variable) |
|
|
Same meaning as the I% (implicit
variable) |
|
|
Number of significant bits in the Minimum time interval is: 2**-n. In IEC norm, the
|
TimeAccuracy is also used
to set specific values of TimeQuality as described
in the following table:
|
Values |
Comments |
|---|---|---|
Unspecified |
0xx11111 |
Used in case of time stamping detection cycle not periodic |
Time invalid |
0xx11110 |
Used in case of buffer full |
IO Channel error |
0xx11101 |
Used in case of IO Channel error detection |
|
0xx11100 |
Used in case of synchronization of the values with the client (done by storing a virtual event with 16-ch discrete values inside the buffer) |
|
0xx11011 |
Used in case of external clock during synchronization (catch up mode) |
If several errors are detected, the precedence of TimeAccuracy specific values are:
TimeAccuracy=IOChannelError(highest prioritority)TimeAccuracy= Invalid orTSInitTimeAccuracy=ClockInSyncTimeAccuracy= Unspecified