Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 271

■Inverse engineering value conversion
This function block converts the setting value (SV) of an engineering value into a setting value (SV) in percentage (%).
100
×(SV-RL)
SV(%)=
RH-RL
RH: Engineering value high limit, RL: Engineering value low limit, SV: Setting value
■Disable alarm detection
This function block sets whether to detect alarms (ALM) or not in the deviation check.
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.
• MV is cleared to 0.
• The control mode is automatically switched to MANUAL.
• When DVLA of the alarm (ALM) has occurred, the DVLA is reset.
• No alarm is detected in the deviation check.
■Processing operation
: Performed, : Not performed
Control mode Processing operation
Deviation check

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 (PVP), operation constant (DVLS, PN, SVPTN_B0), or tag data is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The operating time (ST_) setting is less than 0.
The execution cycle (T) setting is less than 0.
The sample time (STHT) setting is less than 0.
The value divided the operating time (ST_) by the execution cycle (T) exceeds 32767.
The value divided the sample time (STHT) by the execution cycle (T) exceeds 32767.
Disable alarm detection processing
If the following bits in the disable alarm detection (INH) are TRUE, no DVLA of
the alarm (ALM) will be detected.
• ERRI
• DVLI
Page 269 Loop stop processing
SPI operation Engineering value
conversion
 
 
10.14 Sample PI Control (Disable Tracking for primary loop) (M+P_SPI)
Inverse Alarm
engineering value
conversion
*1
 
*1
 
10 LOOP CONTROL OPERATION
10
269