Yokogawa EJX930A - Manual (Page 79)

<Appendix 1. Signal Characterizer (SC) Block>
A1-2
IM 01C25T02-01E
Y
or
X
X or Y
Input section
Line-segment factor
determination section Output section
IN_1
Determining
the mode
Determining
the gradient
and intercept
Determining the
status and
computing OUT
OUT
processing
BLOCK_ERR
FA0102.ai
IN_2
CURVE_X
CURVE_Y
SWAP_2
OUT_1
OUT_2
 MODE = AUTO
 MODE = MAN or O/S


Figure A1.2 Overview of the Signal Characterizer Block
The following describes the Signal Characterizer
block, dividing its functions into three sections:
• Input section: Determines the mode and judges
BLOCK_ERR.
• Line-segment factor determination section:
Determines the gradient and intercept for
OUT_1 and
OUT_2 based on CURVE_X, CURVE_Y, and
SWAP_2 at shift .
• Output section: Multiplies the input values in
IN_1 and IN_2 by the gradient and adds the
intercept to them before outputting the results.
Alternatively, it outputs a limit value.
A1.2 Input Section
The input section determines the mode and judges
BLOCK_ERR.
A1.2.1 Determining the Mode
The following describes operations of the Signal
Characterizer block.
Supported Mode Rules
O/S
(Out of Service)
• System-stopped status
• Configuration change
Man • If you do not want to output the
value and the status from IN, you
can manually transmit the value to
OUT.
Auto • Automatic system operation status
A1.2.2 Judging BLOCK_ERR
BLOCK_ERR indicates the cause of an error in the
function block. If the cause of an error indicated by
BLOCK_ERR occurs, the following configuration
error is generated.
Name Description
Block
Configuration
Error
1) “–INFINITY” has been configured for
CURVE_X and CURVE_Y.
2) “+INFINITY” has been configured for
X1 of CURVE_X.
3) “+INFINITY” has been configured for
Y1 of CURVE_Y.
4) A value of the array of CURVE_X
does not increase in a monotone
manner.
5) A configuration error when SWAP_2
is on
• A value of the array of CURVE_Y
does not increase or decrease in a
monotone manner.
6) The value of SWAP_2 is any value
other than 1 or 2.
The mode changes to O/S if a block configuration
error occurs.