400
Graphs
Section 7-10
S
Differences in trend graph display method according to percentage values
The display method of a trend graph differs according to the percentage value
range.
(1) When the percentage value is negative
The following happens, depending on the setting for “Display Sign”:
- No check mark:
The graph line is displayed as 0% (“Display %” is
shown in negative value).
- Check mark:
Displayed in the minus range
(2) When the absolute value of the percentage value is in the range of 100% to
999%
If the percentage value enters the range 100 to 999% or
−
100 to
−
999%,
and the line projects out of the graph area, only the part of the line inside the
graph area is displayed.
If a check mark is set for “Display %”, the calculated percentage value is
displayed.
Latest data
−
300%
100%
−
100%
0%
Latest data
50%
(3) When the absolute value of the percentage value is greater than 1000%
If the percentage value exceeds 1000% or enters the range below
−
1000%
and the line projects out of the graph area, only the part of the line inside the
graph area is displayed, as in (2) above.
If a check mark is set for “Display %”, the percentage value is displayed as
follows.
- “
∗∗∗∗
%”
S
Data logging function and background function
The data logging function is a function for recording (logging) the displayed val-
ues internally.
Normally, the data sampled for a trend graph is not recorded internally, but by
using the data logging function it is possible to back track and display past data.
With the NT31/NT31C, the data logging function can be used for the data of up to
8 lines. The maximum data quantity that can be recorded for each is 1440
points, and when this limit is exceeded the data is deleted from the oldest points.
If the “Clear Log” touch switch has been set, the data can be cleared at any time.
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...