GE EPM 9650/9800 manual Limit Trigger Log Format

If the historical record was recorded after powering up or the log was reset, the record does not contain information covering a full interval and the most significant bit of the second’s byte will be set. If the historical record was recorded after time was adjusted, the record might contain more or less than a full interval’s worth of data. If time is advanced within the current interval, or advanced or rolled back to outside the current interval, the record contains leass than a full interval’s worth of data and the most significant bit of the minute byte will be set. If time is rolled back within the same interval, the record contains more than a full interval’s worth of data and the bit before the most significant bit (bit 6) of the minute byte will be set.

If the Historical Log 2 Time of Use Enable byte (45952) is disabled, the remaining bytes are the values requested by the Historical Log 2 Data Pointers (45333-45460). If the first Data Pointer is requesting VBN a 4 byte value, then the next 4 bytes in the Record are VBN. This continues, Data Pointer for Data Pointer, until all Data Pointers have been satisfied, or the number of bytes is equal to the Historical Log 2 Record Size.

6.4: Limit Trigger Log Format

Profile Information is in the Programmable Settings Block.

The Limit Trigger Log records an entry every time limit values monitored by the EPM meter change their state. The log records information about the limits—for example, which limits are currently exceeded, which limits have just changed—and records a snapshot of values as specified by the Historical Profile for Log 1.

Record Format: A Record contains 32 bytes.

•The first eight bytes in each record is the Time Stamp. The format of the Time Stamp is:

Byte		Format	Range	Description
	0	binary	0 – 99	century
1		binary	0 – 99	year
2		binary	1 – 12	month
3		binary	1 – 31	day
4		binary	0 – 23	hour
5		binary	0 – 59	minute
6		binary	0 – 59	second
7		binary	0 – 99 + MSB centisecond

Note: This log does not record records during Test Mode.

An additional piece of information is contained in the centisecond byte. The most significant bit indicates whether this SOE record is contiguous in monitoring with the previous record. If the bit is 1, then this is the first record recorded after a power-down, reset or download and all unfinished durations prior to this record are lost. If the bit is zero, then monitoring was continuous between the last record and this one.

•The next four bytes are a bitmap for the current state of the Value 1 Comparisons of the Limits. The first bit (the most significant bit of the first byte) is the current state of the 1st Limit's Value 1 Comparison. The last bit (the least significant bit of the fourth byte) is the current state of the

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