Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 338

• High/low limiter
High/low limiter processing result
Execution cycle (ΔT)
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
■Engineering value conversion
This function block converts an input value (%) to an engineering value.
RH-RL
PVn = × PVPn(%)+RL
100
RH: Engineering value high limit
RL: Engineering value low limit
PVPn: PV input value (%)
PVn: PV1, PV2
■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
MV: Manipulated value (%)
MVN: Output conversion output value
■Disable alarm detection
This function block sets whether to detect alarms (ALM) or not in the variation rate & high/low limiter processing.
Item
Disable alarm detection by setting tag data
Disable alarm detection by loop stop processing
10 LOOP CONTROL OPERATION
336
10.29 Loop Selector (Enable Tracking from secondary loop to primary loop) (M+P_SEL_T3_)
High/low limiter processing
result
MH
ML
Variation rate limiter processing value
0(%) 100(%)
MV
}+NMIN
100
Variation rate limiter processing value
Alarm (ALM)
Output Low Limit Alarm (MLA)
FALSE (Reset)
TRUE (Detected)
FALSE (Reset)
Manipulated
variable
(110(%))
Disable alarm detection processing
If the following bits in the disable alarm detection (INH) are TRUE, no DMLA,
MHA, or MLA of the alarm (ALM) will be detected.
• ERRI
• DMLI
• MHI
• MLI
Page 337 Loop stop processing
High/low limiter
processing value
Output high limit
(MH)
Output low limit
(ML)
t
Output High Limit Alarm
(MHA)
TRUE (Detected)
FALSE (Reset)
FALSE (Reset)