Yokogawa EJX930A - Manual (Page 114)

<Appendix 4. Arithmetic (AR) Block>
A4-3
IM 01C25T02-01E
A4.2.3 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 “uncertain.”
3 Handles IN_1 as a “good” status input if its
status is “bad.”
4 Handles IN_2 as a “good” status input if its
status is “uncertain.”
5 Handles IN_2 as a “good” status input if its
status is “bad.”
6 Handles IN_3 as a “good” status input if its
status is “uncertain.”
7 Handles IN_3 as a “good” status input if its
status is “bad.”
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 the input status is “Bad.
Not Connected,” INPUT_OPTS does not apply and
the input is considered “bad” as is.
A4.2.4 Relationship between the Main
Inputs and PV
The value and PV status are determined by the
statuses of two main inputs, INPUT_OPTS, and
RANGE_LO and RANGE_HI.
• If the statuses of two main inputs are both
“good” or anything other than “good”
See A4.2.1, Main Inputs.
• If only one of two main inputs has “good” status
after application of INPUT_OPTS, the PV value
is determined as follows:
• If the status of IN is “good” and that of
“IN_LO” is anything other than “good”
IN > RANGE_LO → PV = IN
IN ≤ RANGE_LO → See A4.2.1.
• If the status of IN is anything other than
“good” and that of “IN_LO” is “good”
IN_LO < RANGE_HI → PV = IN_LO
IN_LO ≥ RANGE_H → See A4.2.1.
RANGE_LO
RANGE_HI
PV = IN_LO
PV = IN
PV = g × IN + (1-g) × IN_LO
PV = g × IN + (1-g) × IN_LO
IN
IN_LO
FA0403.ai
If the status of IN is “good” and that of “IN_LO” is
anything other than “good”
If the status of IN is anything other than “good”
and that of “IN_LO” is “good”