Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 108)

<APPENDIX 6. Enhanced ARITHMETIC (AR) BLOCK>
A6-1
IM 01F06F00-01EN
APPENDIX 6. Enhanced ARITHMETIC
(AR) BLOCK
The Arithmetic (AR) block switches two main inputs
of different measurement ranges seamlessly and
combines the result with three auxiliary inputs
through the selected compensation function (10
types) to calculate the output.
For the METHOD of AR block, refer to APPENDIX
10.2 “Enhanced AR Block.”
A6.1 Schematic Diagram of Arithmetic Block
The diagram below shows the Arithmetic block schematic.
Input Computing
Output
IN_LO
IN_1 (IN_1+BIAS_IN_1) x GAIN_IN_1
(IN_2+BIAS_IN_2) x GAIN_IN_2
(IN_3+BIAS_IN_3) x GAIN_IN_3
IN_2
IN_3
IN
PV
t_1
t_2
t_3
RANGE_LO
BIAS_IN_i GAIN_IN_i
RANGE
EXTENSION
FUNCTION
RANGE_HI
ARITH_TYPE
ARITH_TYPE
1 to 10
ARITH_TYPE
32 to 36
OUT
func
COMP_LO_LIM
COMP_HI_LIM
OUT_HI_LIM
OUT_LO_LIM
x GAIN
+ BIAS
PRE_OUT
MAN
O/S
FA0601.ai
Figure A6.1 AR Block
The Arithmetic block is divided into three sections:
• Input section: Makes a go/no-go decision on the
use of an input value, switches the range, and
determines the PV status.
• Computation section: Makes calculations
through ARITH_TYPE.
• Output section: Applies gain multiplication and
bias addition to the calculated result to perform
limitation processing for output.
* The range extension function compensates the
IN and IN_LO input values when two devices with
different ranges are connected, to make smooth
input switching.