Yokogawa EJX930A - Manual (Page 78)

<Appendix 1. Signal Characterizer (SC) Block>
A1-1
IM 01C25T02-01E
Appendix 1. Signal Characterizer (SC)
Block
The Signal Characterizer (SC) block is used to
convert the values of input signals according to a
line-segment function. The line-segment function
is created using 21 points of the X/Y coordinates
specified by the user. This function block can also
be used as a transmission line for control signals
and supports backward control.
Application
The Signal Characterizer block is primarily used
if you wish for one of the following reasons to
correct signals using the coordinates rather than a
computational expression:
• The computational expression for correction in
relation to input signals is complex
• The relationship between input signals and
the signals after correction is only empirically
known
A1.1 Schematic Diagram of
Signal Characterizer Block
The following shows the schematic diagram of the
Signal Characterizer block.
OUT_1
OUT_2
x
y
x
y
Inverse
function
ON
OFF OFF
ON
SWAP_2
IN_1
IN_2
FA0101.ai
Figure A1.1 Signal Characterizer Block
Input/Output Parameters
Input IN_1 Inputs a signal desired to be corrected using a line-segment function.
(It is substituted for X of the line-segment function.)
IN_2 Inputs a signal desired to be corrected using a line-segment function.
(If SWAP_2 = off, it is substituted for X of the line-segment function.)
(If SWAP_2 = on, it is substituted for Y of the line-segment function.)
Output OUT_1 Outputs the result of the IN_1 input that has been corrected using the line-segment function.
(The function block outputs the value of Y corresponding to IN_1.)
OUT_2 Outputs the result of the IN_2 input that has been corrected using the line-segment function.
The output can also be approximated using the inverse function of the specified line-segment
function. (This is used for backward control.)
(If SWAP_2 = off, the value of Y corresponding to X of IN_1 is output.)
(If SWAP_2 = on, the value of X corresponding to Y of IN_1 is output.)
Others CURVE_X The points of the curve determining inputs and outputs.
The x points of the curve are defined by an array of 1 to 21 points with a monotone increase.
"+INFINITY" is configured for unused point(s).
CURVE_Y The points of the curve determining inputs and outputs.
The y points of the curve are defined by an array of 1 to 21 points.
If SWAP_2 = on, the elements of the curve are defined with a monotone increase or decrease.
"+INFINITY" is configured for unused point(s).
SWAP_2 Selector switch used to specify if an inverse function is used for the line-segment
approximation of IN_2 to OUT_2.
The setting of SWAP_2 = on (which uses the inverse function) is used for backward control.