![background image](http://html1.mh-extra.com/html/omron/nt21-series/nt21-series_reference-manual_744543435.webp)
Appendix A
Specifications
426
Element
Restriction on Read Data
Analogue meter
One numeral memory table
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.
Broken line graphs
Number of numeral memory tables determined by number of graph lines
number of
vertices
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.
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
•
Restrictions due to element coefficients
The PT 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
Recipe
1 + number of lines in name field + number of lines in parameters field + number of
dedicated touch switches
Bar graphs
1
Analogue meter
1
Broken line graphs
1
Trend graphs
1 + number of dedicated touch switches
electronic components distributor
Summary of Contents for NT21 Series
Page 3: ...iv Downloaded from Elcodis com electronic components distributor...
Page 5: ...vi Downloaded from Elcodis com electronic components distributor...
Page 463: ...Downloaded from Elcodis com electronic components distributor...
Page 465: ...Downloaded from Elcodis com electronic components distributor...