Omron NT31 Operation Manuals page 656

Specifications
Element
Trend graphs
Alarm lists
Alarm history
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
Fixed displays (text, graphics) 1, regardless of how many there are on the screen
Image data
Library data
Marks
Touch switches
Lamps
Numeral inputs
Character string inputs
Thumbwheel switches
Numeral displays
Character string displays
Bar graphs
Analogue meter
Broken line graphs
Trend graphs
Alarm lists
Alarm histories
Data logging Number of numeral memory tables determined by the number of
function not used 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 Number of background memory tables determined by the
function used 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.
Number of bit memory tables referenced.
None
1
1
1 (or 2 if there is a cursor moving key touch switch) + number of dedicated touch
switches
1 (or 2 if there is a cursor moving key touch switch) + number of dedicated touch
switches
1 + number of displayed digits
1
1
1
1
1
1 + number of dedicated touch switches
1 + number of display lines + number of dedicated touch switches
If image/library data is displayed, the total is increased by another 64.
1 + number of display lines + number of dedicated touch switches
If image/library data is displayed, the total is increased by another 64.
Restriction on Read Data
Element Coefficient
2
APPENDIX A
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