Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 327

■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(%)) 0(%)
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
■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) is TRUE, this function block performs the following processing.
• Outputs (MVN) are held.
• The control mode is automatically switched to MANUAL.
• When DMLA, MHA, or MLA of the alarm (ALM) has occurred, the DMLA, MHA, or MLA is reset.
• No alarm is detected in the variation rate & high/low limiter processing.
■Processing operation
: Performed, : Not performed
Control mode Processing operation
Engineering value
conversion
MAN, CMV 

AUT, CAS, CSV
*1 An alarm whose corresponding bit is TRUE (Valid) in the disable alarm detection (INH) is not detected.
Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data 1 (PVP1), operation constant (NMAX, NMIN), tag data, or input data 2 (PVP2) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
100(%) (110(%))
MV
}+NMIN
100
Variation rate & high/
low limiter


10.26 Loop Selector (Disable Tracking for primary loop) (M+P_SEL)
Manipulated
variable
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 325 Loop stop processing
Output conversion


10 LOOP CONTROL OPERATION
Alarm
*1

*1

325
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