GE EPM 9650/9800 manual Pollable information would consist, Historical Log Settings Block

Hysteresis combination uses comparison 1 to set the combination, and comparison 2 to clear the combination. If both inputs are asserted, comparison 1 has priority. The usual arrangement would be to program comparison 1 to above a large value and comparison 2 to below a small value. When the monitored value goes above comparison 1, the combination will be set to a 1, until the

monitored value goes below comparison 2, when the combination will be cleared to a 0.

Pollable information would consist of:

32 bits	Comparison 1 states for 32 limits
32 bits	Comparison 2 states for 32 limits
32 bits	Combination states for 32 limits

Total of 96 bits (12 bytes)

7.3: Historical Log Settings Block (45205-45464)

Historical Log 1 Data Pointers (45205 - 45332), Historical Log 2 Data Pointers (45333 - 45460).

These registers indicate which information to include in a record in the Historical Log. Each Data Pointer has the following 4 (four) byte structure:

	Data Pointer 4-Byte Structure
Size	Format	Description
2 byte	Unsigned Integer	Line Number
1 byte	Unsigned Character	Point Number
1 byte	Unsigned Character	Reserved

A Line Number is an index into the Communication Table. Example: Line Number 11 is for the 12th line in the Communication Table, 0.1 second Phase-to-Neutral Voltages. Data Pointers with Line Numbers greater than the number of lines in the table are ignored.

A Point Number is an index into a Line in the Communication Table. Example: Point Number 1 is for the second entry in a Line. Line Number 11, Point Number 1 is the 2nd in the 12th line, 0.1 second VBN. Data Pointers with Point Numbers greater than the number of points for the line are

ignored.

Snapshot Interval for Historical Log 1 (45361), for Historical Log 2 (45462).

One register, 2 byte unsigned integers ranged from 0 to 3600.

The unit is 1 Second.

Historical Log 1 Record Size (45463), Historical Log 2 Record Size (45464).

This register is an enumeration for the size of a record in the Historical Log. The valid values are:

0x00000 = 32 byte records	0x00002 = 128 byte records	0x00004 = 16 byte records
0x00001 = 64 byte records	0x00003 = 256 byte records

7-3