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<Appendix 3. Arithmetic (Ar) Block>
257
IM 01E21A02-03EN
Example
RANGE_LO 20
RANGE_HI 300
In the above case, the followings are established:
IN = 310, IN_LO = 20 => PV = 310
IN = 230, IN_LO = 20 => g = (230−20) / (300−20) = 0.75
PV = 0.75 x 230 + (1−0.75) x 20 = 177.5
IN = 90, IN_LO = 20 => g = (90− 20) / (300−20) = 0.25
PV = 0.25 x 230 + (1-0.25) x 20 = 37.5
IN = 19, IN_LO = 10 => PV = 10
A3.2.2 Auxiliary Inputs
There are bias and gain parameters for the IN_1, IN_2, and IN_3 auxiliary inputs. The following
shows the equation using them.
t_i = (IN_i + BIAS_IN_i) x GAIN_IN_i
The bias parameter is used for calculating absolute temperature or absolute pressure, while the
gain parameter is used for normalization of square root extraction.
A3.2.3 INPUT_OPTS
INPUT_OPTS has an option that handles an input with “uncertain” or “bad” status as a “good”
status input.
Bit Function
0 Handles IN as a “good” status input if its status is “uncertain”.
1
Handles IN_LO as a “good” status input if its status is
“uncertain”.
2 Handles IN_1 as a “good” status input if its status is “bad”.
3 Handles IN_1 as a “good” status input if its status is “uncertain”.
4 Handles IN_2 as a “good” status input if its status is “bad”.
5 Handles IN_2 as a “good” status input if its status is “uncertain”.
6 Handles IN_3 as a “good” status input if its status is “bad”.
7 Handles IN_3 as a “good” status input if its status is “uncertain”.
8 to 15 Reserved
There are options called “IN Use uncertain” and “IN_LO Use uncertain” for the IN and IN_LO
inputs. When these options are valid, IN and IN_LO are internally interpreted as “good” IN and
IN_LO even if their statuses are “uncertain”. (There is no option for “bad” status.)
For the IN_1, IN_2, and IN_3 auxiliary inputs, there are options known as “IN_i Use uncertain”
and “IN_i Use bad”. If these options are valid, an IN_i with “uncertain” or “bad” status is internally
interpreted as a “good” IN_i.
* The exception is that if each input status is “Bad.NotConnected”, INPUT_OPTS does not
apply and the input remains bad.