User Manual

<18. AR Function Block>
18-5
IM 21B04C01-01E
F1804.ai
PRE_OUT
OUT
AUTO MAN AUTO
BAL_TIME
Case of BAL_TIME = 5 sec
The value of OUT is represented by the following
equation.
yn = yn-1 + (xn -yn-1) / (α - n)
α = (T / tc) + 1
*: The value of T/tc truncates digits to the right of the
decimal point.
where y: OUT
x: PRE_OUT
tc: period of execution
T: BAL_TIME
n: period
18.4.2 Status Handling
The setting of INPUT_OPTS is applied to the input
status. When INPUT_OPTS is applied, there are
cases where the PV status becomes “good” even if
the status of main inputs is “uncertain” or the status
of auxiliary inputs is “uncertain” or “bad.”
The PV status is classied by the following:
• If the statuses of two main inputs are both
“good” or anything other than “good”:
See 18.2.1, Main Inputs.
• If only one of the statuses of two main inputs is
“good”:
• If the status of IN is “good” and that of
“IN_LO” is anything other than “good”
IN > RANGE_LO → The status of IN
applies.
IN ≤ RANGE_LO → See 18.2.1, Main
Inputs
• If the status of IN is anything other than
“good” and that of “IN_LO” is “good”
IN_LO < RANGE_H → The status of IN_LO
applies.
IN_LO ≥ RANGE_HI → See 18.2.1, Main
Inputs
The exception is that if RANGE_LO > RANGE_HI,
the PV status is made “Bad. Conguration Error.”
The input status irrelevant to the computing
equation selected by ARITH_TYPE will be ignored
and does not affect other statuses. The statuses
of outputs (OUT.Status and PRE_OUT.Status) are
interpreted as the status of the worst input among
the statuses of PV and auxiliary inputs (IN_1,
IN_2, and IN_3) to which INPUT_OPTS has been
applied.
Example:
Case 1 Case 2 Case 3
PV Good
IN_1 Uncertain
IN_2 Bad
IN_3 Bad
INPUT_
OPTS
IN_1
Handled
as a
“good”
input if
its status is
“uncertain.”
No option
IN_2
Handled as a “good”
input if its
status is “bad.”
No option
IN_3 No option
ARITH_TYPE
1) Flow compensation (linear) in
18.3.1, “Computing Equations”
OUT.Status Good Uncertain Bad