Omron NT31 Series, Operation Manuals

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391
Graphs
Section 7-10
[Input Functions]
Broken line graphs have no input function.
[Output Functions]
Broken line graphs have no output function.
[Processing Functions]
Broken line graphs calculate the percentage value in accordance with the settings
made for “Settings” (properties of each broken line).
For details on the calculation method depending on the “Settings” (properties of
each broken line) settings, refer to “Common Attributes” (page 386).
[Relationship with Other Elements]
S
For details on how numeric values are stored in numeral memory tables, refer to
7-3-1 “Numeral Memory Tables” (page 284).
S
Broken line graphs overlap with other elements in accordance with the order in
which they were registered for the screen with the Support Tool. However, the
way in which they overlap can be changed with the Support Tool.
7-10-4 Trend Graphs
[Function Outline]
Trend graphs represent the changes over time in the contents of a numeral
memory table as one line.
It is possible to display more than one such line in the same frame so that they can
be compared.
There are two types of trend graph: the standard type, where the graph is drawn
as though a pen were moving across paper, and the “pen recording type”, where
the graph is drawn as though the paper were moving under a pen.
With trend graphs, a 100% value, 0% value and
−
100% value can be set for each
line in order to calculate and display the numeral memory table values in percent-
age terms. The current percentage can be displayed.
Past values can be recorded, and then displayed by back tracking (the “logging
function”), and the contents of numeral memory tables can be collected even while
other screens are displayed (the “background function”).
[Restrictions]
S
One trend graph frame can be registered for one screen. (Same for window
screen.) For an overlapping screen comprising 8 child screens, up to 8 trend
graph frames can be registered on each screen. Total maximum of 50 broken
lines can be registered on each screen. Total maximum of 50 broken lines can
be registered for one screen regardless of the number of frames. (Same for win-
dow screen.)
There is no restriction on the number of trend graph frames that can be regis-
tered for one screen data file: any number can be registered as long as the data
file capacity is not exceeded. However, if a large number of elements are regis-
tered, check that the restrictions on element display are complied with by refer-
ring to “Display Restrictions” (page 644).