Omron NT21 User Manual

Appendix ASpecifications
432
Element Restriction on Read Data
Character string displays Direct specification One character string memory table entry
gpy
Indirect specification One character string memory table entry
One memory table indirect reference
Recipe None
Bar graphs 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.
Analogue meter 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.
Broken line graphs 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.
Trend graphs Data logging function not used 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.
Data logging function used 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.
Alarm lists Number of bit memory table entries 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

Omron NT21 Specifications

General

Brand	Omron
Model	NT21
Category	Touch terminals
Language	English