Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 165

■Reset windup
This function block performs processing without considering the value of ARW_EX_EN.
As countermeasures against reset windup, this function block sets a manipulated value to the high/low limit value when the
manipulated value has exceeded the limit value, and quickly responds to a control target when deviation is inverted.
Condition
ΔT
MHA=1 and ≤1
Ti
ΔT
MLA=1 and ≤1
Ti
MHA: Output high limit alarm
MLA: Output low limit alarm
MH: Output high limit value
ML: Output low limit value
MVP: MV internal operation value
T: Execution cycle
T: Tentative manipulated value
Ti: Integral time
However, when Ti is 0, countermeasure processing against reset windup is not performed.
• When ARW_EX_EN is TRUE
As countermeasures against reset windup, this function block immediately sets a manipulated value to the MV internal
operation high/low limit value when the manipulated value has exceeded the limit value, and quickly responds to a control
target when deviation is inverted.
Condition
MVP > MVPH
MVP < MVPL
MVP: MV internal operation value, MVPH: MV internal operation value high limit, MVPL: MV internal operation value low limit
However, when MVPH is smaller than MH, MH is used instead of MVPH in the condition and as the pullback value.
When MVPL is larger than ML, ML is used instead of MVPL in the condition and as the pullback value.
■Tight shut/full open
This tight shut/full open function is used to completely open or close a control valve.
The processing result is reduced to the output value for tight shut when a manipulated value is 0% or lower, and the result is
increased to the output value for full open when a manipulated value is 100% or higher.
• When FOTS_EN is TRUE
Processing result
MVFO
100%
0%
MVTS
0% 100%
MVTS: Output value for tight shut (%), MVFO: Output value for full open (%)
■MV reverse
This function block performs inversion processing (100 - MV) to a manipulated value.
Condition
MVREV_EN = TRUE
MVREV_EN = FALSE
MVREV: Output after processing of MV reverse for internal operation (%), MV: Manipulated value (%)
9.4 Output Processing-3 with Mode Switching (With Input Addition and Compensation) (M+P_OUT3_)
Countermeasure processing against reset windup
MVP=
MVP=
Countermeasure processing against reset windup
MVP = MVPH
MVP = MVPL
MV value
Processing result
MVREV = 100 - MV
MVREV = MV
ΔT
×(MH-T)+T
Ti
ΔT
×(ML-T)+T
Ti
9
9 I/O CONTROL
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