A Point Number is an index into the Communication Table.

Example: Point Number 1 is for the second entry in a Line. Line Number 11, Point Number 1 is the second in the twelfth line, 0.1 second VBN. Data Pointers with Point Numbers greater than the number of

points for the line are ignored.

Record Format: A Record contains 16, 32, 64, 128 or 256 bytes, depending on how many channels have limits assigned to them.

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 – 100

centisecond

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

The remaining bytes are the values monitored by Limits (45077-45204). If the first Data Pointer is requesting VBN, a 4 byte value, then the next 4 bytes in the record is 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 1 Record Size.

6-7

Page 289
Image 289
GE EPM 9650/9800 manual Format Range Description