Logging Data
3-7
March 2008
Checking the Memory
Use the
MEM
submenu to verify that the available log memory is
sufficient for the desired log. If the expected amount of logged data
will exceed the remaining memory capacity, the Model DF868
suggests that some old logs be cleared to make room for the new log.
Press the appropriate side of the
[SCREEN]
key to activate the desired
pane of the display screen, and complete the following steps:
1.
To access the
Log Menu
, press
[LOG]
.
a.
If you have activated the security feature (see Chapter 1,
Programming Site Data
, page 1-63 for details), enter the
assigned password and press
[ENT]
.
2.
Press
[F2]
=
MEM
.
3.
After noting the information, press
[ENT]
to return to the main
Log
Menu
screen.
The
MEM
screen lists the number of remaining unused memory pages
out of the total number of 120 available pages. Also, the number of
pages expected to be used by all currently programmed logs is given.
If the number of pending pages exceeds the number of free pages,
additional memory may be made available by clearing some old logs
(see Chapter 5,
Clearing Data
).
If it is undesirable to delete old logs to free up additional memory, the
number of pages pending may be reduced by altering the parameters
of one or more of the currently active logs. For example, either
increasing the time increment or decreasing the total logging time
will reduce the memory requirements for a log file. Use the following
equations to calculate the number of pages used by a log:
(3-1)
(3-2)
Consider a log that is set to run for 24 hours with a time increment of
3 minutes. From Equation 3-1, the number of records = (24 x 60)/3 =
480 records. Then, from Equation 3-2 above, the number of pages =
480/120 = 4 pages. Thus, at least four pages of memory must be
available for this log to run to completion. Notice that increasing the
time increment to 6 minutes or decreasing the length of the log to 12
hours would reduce the memory requirement to only 2 pages.
number of records
length of log
time increment
---------------------------------------
=
number of pages
number of records
120
------------------------------------------------
=
Содержание DigitalFlow DF868
Страница 7: ...Chapter 1 ...
Страница 75: ...Chapter 2 ...
Страница 91: ...Chapter 3 ...
Страница 105: ...Chapter 4 ...
Страница 116: ...Chapter 5 ...
Страница 117: ...Clearing Data Introduction 5 1 Clearing Totalized Data 5 2 Deleting Site Files 5 2 Deleting Log Files 5 3 ...
Страница 121: ...Chapter 6 ...
Страница 132: ...Appendix A ...
Страница 142: ...Appendix B ...
Страница 143: ...Data Records Option Cards Installed B 1 Initial Setup Data B 2 ...
Страница 149: ...Appendix C ...
Страница 169: ...Appendix D ...