Omron NT21 Reference Manual page 445

Specifications
Element
Character string displays g p y
Recipe
Bar graphs
Analogue meter
Broken line graphs
Trend graphs
Alarm lists
Alarm history
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
Fixed displays (text,
graphics)
Image data
Library data
Marks
Touch switches
Lamps
Numeral inputs
Character string inputs
Thumbwheel switches
Numeral displays
Character string displays
432
Direct specification
Indirect specification
None
One numeral memory table entry
When numeral memory table entries are designated for each of the –100%, 0%, and
100% settings for each graph line, one numeral memory table entry is read for each
of these settings.
One numeral memory table entry
When numeral memory table entries are designated for each of the –100%,0%, and
100% settings for each graph line, one numeral memory table entry is read for each
of these settings.
Number of numeral memory table entries determined by number of graph lines
number of vertices
When numeral memory table entries are designated for each of the –100%, 0%, and
100% settings for each graph line, one numeral memory table entry is read for each
of these settings.
Data logging function not used
Data logging function used
Number of bit memory table entries referenced.
None
1, regardless of how many there are on the screen
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
Restriction on Read Data
One character string memory table entry
One character string memory table entry
One memory table indirect reference
Number of numeral memory table entries
determined by the number of graph lines
When numeral memory table entries are
designated for each of the –100%, 0%, and 100%
settings for each graph line, one numeral memory
table entry is read for each of these settings.
Number of background memory table entries
determined by the number of graph lines
When numeral memory table entries are
designated for each of the –100%, 0%, and 100%
settings for each graph line, one numeral memory
table entry is read for each of these settings.
Element Coefficient
2
Appendix A