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For example: Registers 0x03E7 and 0x03E8 are programmed to be recorded by the historical
log. The matching descriptor gives the data type as float, and the size as 4 bytes. These registers
program the log to record "Primary Readings Volts A-N."
Historical Log Blocks:
Start Register:
Block Size:
The Historical Log programmable settings are comprised of 3 blocks, one for each log. Each
is identical to the others, so only Historical Log 1 is described here. All register addresses in
this section are given as the Historical Log 1 address (0x7917).
Each Historical Log Block is composed of 3 sections: The header, the list of registers to log,
and the list of item descriptors.
i.
Header:
Registers:
Size:
Byte
Value
E
Electro Industries/Gauge Tech
0
1
# Registers
# Sectors
# Registers: The number of registers to log in the record. The size of the record
in memory is [12 + (# Registers x 2)]. The size during normal log retrieval is [6
+ (# Registers x 2)]. If this value is 0, the log is disabled. Valid values are {0-
117}.
# Sectors: The number of Flash Sectors allocated to this log. Each sector is
64kb, minus a sector header of 20 bytes. 15 sectors are available for allocation
between Historical Logs 1, 2, and 3. The sum of all Historical Logs may be less
than 15. If this value is 0, the log is disabled. Valid values are {0-15}.
Interval: The interval at which the Historical Log's Records are captured. This
value is an enumeration:
0x01
0x02
0x04
0x08
0x10
0x20
0x40
0x80
0x7917 (Historical Log 1)
0x79D7 (Historical Log 2)
0x7A97 (Historical Log 3)
192 registers per log (384 bytes)
0x7917 – 0x7918
2 registers
2
1 minute
3 minute
5 minute
10 minute
15 minute
30 minute
60 minute
End of Interval (EOI) Pulse: Setting the interval to EOI
causes a record to be logged whenever an EOI pulse
event is generated. This is most commonly used in
conjunction with the Digital I/O Option Cards.
NOTE: The interval between records will not be even
(fixed), and thus should not be used with programs that
expect a fixed interval.
Doc# E149701
3
Interval
B-5
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