Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 335

■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.
■Tracking processing
The following table shows whether tracking processing to the input variable CASIN_T is performed or not.
• Tracking of the input variable CASIN_T1
Condition
Tracking Flag (TRK)
1
0
• Tracking of the input variable CASIN_T2
Condition
Tracking Flag (TRK)
1
0
■Processing operation
: Performed, : Not performed
Control mode Processing operation
Engineering value
conversion
MAN, CMV 

AUT, CAS, CSV
*1 Tracking is performed when the tracking flag (TRK) is 1.
*2 Tracking is performed when the tracking flag (TRK) is 1 and DMLA, MHA, or MLA of the alarm (ALM) has occurred.
*3 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 (CASIN_T1), operation constant (NMAX, NMIN), tag data, or input data 2 (CASIN_T2) is a subnormal number or NaN (not a
number).
3403H An overflow has occurred.
CASIN_T1 Used (SVPTN_B1)
FALSE
TRUE
FALSE or TRUE
CASIN_T2 Used (SVPTN_B2)
FALSE
TRUE
FALSE or TRUE
Variation rate & Output conversion
high/low limiter
 
 
10.28 Loop Selector (Enable Tracking for primary loop by CASIN_T1/_T2) (M+P_SEL_T2)
Result
The input variable CASIN_T1 is tracked.
The input variable CASIN_T1 is not tracked.
Result
The input variable CASIN_T2 is tracked.
The input variable CASIN_T2 is not tracked.
Tracking Alarm
*1 *3
 
*2 *3
 
10 LOOP CONTROL OPERATION
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