Taylor-Wharton 24K w/ AutoTend - Manual (Page 23)

Logging
The on board memory logging function is one of the most powerful and useful fea-
tures of the KRYOS control. It provides a historical record for not only your freezer but
also a complete record of the environment in which specimens were stored. Four
separate logs are kept in the control:
1. System log – System logs are events that occur in the system such as lid open-
ing/closing, LN
2
filling
,
Quick-Chill, Defog, etc.
2. Error log, - Error logs are off-normal conditions detected by the system.
3. Temperature #1 log, 4. Temperature #2 log. The two temperature logs are simply
records of the temperatures recorded by the two thermocouples in the system.
The system and the error log each hold 4096 events while the combined temperature
logs hold an additional 32,765 temperature events. All the logs are kept in non-volatile
memory, meaning that the information is saved regardless of whether the control has
power.
When an event (system, error or temperature) occurs, the control does two things
with the data:
1. It enters the beginning or the conclusion of an event in the internal memory of the
controller.
2. It sends the event data to the serial port of the freezer.
The control consolidates the events in the internal log (combining “start even” /
”conclude event” information to provide one event with duration), however, when the
data is sent to the serial port no consolidation of data occurs.
As an example, a fill would provide one log entry in the internal log of the control,
indicated as follows: Fill occurred on 9/28/98 @ 8:07 for 24 minutes. The same
data coming out of the serial port would cause two entries in a computer or printer
and would be indicated as follows:
Fill Started on 9/28/98 @ 8:07
… (elapsed time)
Fill occurred on 9/28/98 @ 8:07 for 24 minutes
Menu Access causes the control to make some decisions on logging an event and
they are handled in the following manner: Temperature is immediately logged (if it is
enabled) and then a fresh time period is started when the Menu system is exited.
System and error logs are placed in a suspended state until the control exits the
menu system and timing is started again. Duration of system and error logs then are
total time of the event less any time that the user was in the menu system.
When logs are dumped to the serial port, the oldest events are sent first. The control
operates on the FIFO (First In First Out) method.