645
Specifications
APPENDIX A
Element Restriction on Read Data
Trend graphs Data logging
function not used
Number of numeral memory tables determined by the number of
graph lines
When numeral memory tables are designated for each of the
“−100%”, “0%”, and “100%” settings for each graph line, one
numeral memory table is read for each of these settings.
Data logging
function used
Number of background memory tables determined by the
number of graph lines
When numeral memory tables are designated for each of the
“−100%”, “0%”, and “100%” settings for each graph line, one
numeral memory table is read for each of these settings.
Alarm lists Number of bit memory tables referenced.
Alarm history None
S Restrictions due to element coefficients
The NT31/NT31C uses “element coefficients” to manage display elements. The maximum number of display
coefficients that can be used at the same time is 1024.
If the total of the element coefficients on a screen exceeds 1024, the elements after this total has been reached
are not displayed.
The element coefficients for each element are indicated in the table below. Ensure that the total for the screen to
be displayed is not greater than 1024.
Element Element Coefficient
Fixed displays (text, graphics) 1, regardless of how many there are on the screen
Image data
Library data
Marks
Touch switches 1
Lamps 1
Numeral inputs 1 (or 2 if there is a cursor moving key touch switch) + number of dedicated touch
switches
Character string inputs 1 (or 2 if there is a cursor moving key touch switch) + number of dedicated touch
switches
Thumbwheel switches 1 + number of displayed digits 2
Numeral displays 1
Character string displays 1
Bar graphs 1
Analogue meter 1
Broken line graphs 1
Trend graphs 1 + number of dedicated touch switches
Alarm lists 1 + number of display lines + number of dedicated touch switches
If image/library data is displayed, the total is increased by another 64.
Alarm histories 1 + number of display lines + number of dedicated touch switches
If image/library data is displayed, the total is increased by another 64.
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