19.8.3 Display Historical
Data
The sampling data in the display unit and sampling data in the
CF card/USB storage are displayed as historical data. (From the
[Common Settings] menu's [Sampling], if you set [Back Up Sampling
Data] in the [Mode] tab, sampling data in backup memory (SRAM) is
backed up to the CF card or USB storage device when SRAM is
full.)
 25.8.3.1 Mode / Set
Time
To execute a historical data display on the display unit, you
need the historical data operation switch. You can create the
switch in the historical trend graph or with a Switch/Lamp [Special
Switch].
When using a Historical Trend Graph featuring the Display
Historical Data function, the excluded dotted-line in the diagram
is available for display on the screen. By touching the Display
Historical Data Switch, past data stored in the display unit can be
viewed on the graph.
For example, Number of Samples Taken: 14, Data Samples (shown):
6
Data Numbers/Data Values
Data Numbers are assigned to data values, with the most recent
data value specified as Data Number 0. The data values are stored
by data number and are in reverse chronological order, starting
with the most recent numbered as "0", followed by "1", "2", "3",
etc.
When a Historical Trend Graph with the Display Historical Data
function displays on the display unit, the most recent data samples
(picture portion A) and the historical data samples (picture
portion B) are automatically stored in the Special Relay Area
(LS9000 to ) in the display unit Internal Device. Data numbers are
stored in the LS area as binary numbers in the range of 0 to
65,237. The data type is Bin.
( to understand the data sampling in the drawing above, the data
numbers and data values of portion A and B are displayed
below.)
The data samples and data values are stored even if a graph is
not in Display Historical Data mode.
-
When a screen change occurs, all data
samples stored in the Special Area (LS9000+) of the display unit
internal device are cleared to 0.
-
Each inputted data is converted to the
display value and saved as a ratio of 1000. When using
[Sign+/-], range is -1000 to 1000. (The value is converted to the display
data) to display the data value "200" as "20.0" in a Data Display,
set the [Decimal Places] to "1".
-
When Show Scale is set, data values are
stored as the actual sampled value, instead of a ratio of 1000.
-
For a read error, FFFF(h) is stored as the data
value in the display unit's internal device.
-
When the data format is set to BCD and data
containing A to F(h) is stored as sampled data, the previous value
is stored as the data value in the display unit's internal
device.
-
When sampled data is 32 bits, data in the
bottom 16 bits is stored as the data value in the display unit's
internal device.
Display Historical Data Examples
Touching the "Back" switch scrolls the data backward by the
predetermined scroll number and displays previous data records.
Touching the [Back] switch while displaying the oldest
historical data causes the buzzer to sound three times. Data cannot
be scrolled further.
Touch the [Fwd] switch to scroll the data forward by the scroll
number.
When you scroll to the most recent data samples after changing
to Display Historical Data mode, the graph will appear blank.
Touching the [FWD] switch again causes the buzzer to sound three
times, indicating data cannot be scrolled further.
Data samples are still taken in Display Historical Mode.
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