Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 158

Processing details
■Variation rate & high/low limiter
This function block checks the variation rate and high/low limits of the input value.
• Variation rate limiter
Variation rate limiter processing result
DML
Execution cycle (ΔT)
Control cycle (CT)
Condition
|T - MV|  DML
T - MV > DML
T - MV < -DML
T: Tentative manipulated value, MV: Manipulated value, DML: Output variation rate high limit value
• High/low limiter
High/low limiter processing result
Execution cycle (ΔT)
Control cycle (CT)
Condition
Variation rate limiter processing result
> MH
Variation rate limiter processing result
< ML
ML  Variation rate limiter processing
result  MH
MH: Output high limit value, ML: Output low limit value
■Output conversion
This function block performs output conversion processing.
Converted output (MVN)
NMAX
NMIN
(-10(%))
Converted output (MVN)={(NMAX-NMIN)×
NMAX: Output conversion high limit value
NMIN: Output conversion low limit value
MV: Manipulated variable (%)
MVN: Output conversion output value
9 I/O CONTROL
156
9.3 Output Processing-2 with Mode Switching (Without Input Addition) (M+P_OUT2)
Tentative MV value (T)
DML
DML
Control cycle (CT)
Variation rate limiter processing result
T
MV + DML
MV - DML
Variation rate limiter processing value
Control cycle (CT)
High/low limiter processing
result
MH
ML
Variation rate limiter processing value
0(%) 100(%)
MV
}+NMIN
100
DML
DML
Control cycle (CT)
Control cycle (CT)
Alarm (ALM)
Output low limit (MLA)
FALSE (Reset)
TRUE (Detected)
FALSE (Reset)
Manipulated
variable (MV)
(110(%))
Variation rate limiter
processing value
DML
DML
t
Alarm (ALM)
Output variation rate limit (DMLA)
FALSE (Reset)
TRUE (Detected)
TRUE (Detected)
High/low limiter
processing value
Output high limit
(MH)
Output low limit
(ML)
t
Output high limit (MHA)
TRUE (Detected)
FALSE (Reset)
FALSE (Reset)