2 status handling, Status handling -5 – Yokogawa YVP110 User Manual

Page 104

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<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 classified 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. Configuration 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

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