15
Magtrol AN 2000 C
Instruction Manual
2./ Action modes
The figure below represents two modes of operation
obtained by programming increasing or decreasing display
values for increasing input values.
Forward operation:
- When input signal
increases
, the display
increases
.
- When input signal
decreases
, the display
decreases
.
Reverse operation:
- When input signal
increases
, the display
decreases
.
-
When input signal
decreases
, the display
increases
.
3.2 - Display configuration
After selection of the input range, it may be necessary to
scale the instrument for the particular application. For many
common applications, single slope scaling (2 points) should
be sufficient to have good readings over the entire process
range. Other applications, in which non-linear devices are
used may require linearizing the signal. This is accomplished
by scaling the meter with more than two points (see
fig. 17.1)
Type of function
Nº of scaling points
Linear function
2 points
Non-linear function
Max 30 points
1./ Scaling the display.
The procedure of scaling the display consists of
programming a minimum of two points composed each by
an input (INP#) and a display (DSP#) coordinates.
When scaling the meter with two points (linear function),
they should be located near the process limits for the best
possible accuracy.
For multi-point scaling, it is recommended to use the most
possible number of points and to reduce the segment length.
The input signal values of the scaling points must be
all increasing or all decreasing. Avoid programming
two different displays for two equal inputs.
The display
values can be entered in any order and even be repeated for
two or more input values.
Fig. 15.1: Linearizing
function with 6
segments (7 points).
Up to 11 segments are
available.
(inp1, dsp1)
(inp2, dsp2)
(inp3, dsp3)
(inp4, dsp4)
(inp5, dsp5)
(inp6, dsp6)
(inp7, dsp7)
DISPLAY 2
INPUT 2
DISPLAY 1
INPUT 1
DISPLAY 1
INPUT 2
DISPLAY 2
INPUT 1
Forward operation
Reverse operation
