6-7
APoint 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.
QRecord Format: ARecord 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.