Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 287

■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 Tracking is performed when the tracking flag (TRK) is 1.
*2 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 (MTD, DVLS, PN, TRK, SVPTN_B0, SVPTN_B1), or tag data is a subnormal number or NaN (not a
number).
3403H An overflow has occurred.
3405H The control cycle (CT) setting is less than 0.
The execution cycle (T) setting is less than 0.
The value divided the control cycle (CT) 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 285 Loop stop processing
BPI operation Engineering
value
conversion
 
 
10.17 Blend PI Control (Enable Tracking for primary loop) (M+P_BPI_T)
Inverse Tracking
engineering
value
conversion
*1
 
 
10 LOOP CONTROL OPERATION
10
Alarm
*2

*2

285