Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 339

■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 input variables CASIN_T1 and CASIN_T2 are performed or not.
• Tracking of the input variable CASIN_T1
Condition
Tracking Flag CASIN_T1 Used
(TRK) (SVPTN_B1)
1 FALSE
TRUE
0 TRUE or FALSE
• Tracking of the input variable CASIN_T2
Condition
Tracking Flag CASIN_T2 Used
(TRK) (SVPTN_B2)
1 FALSE
TRUE
0 TRUE or FALSE
Set the same program execution cycle and the control cycle (CT) for both of the primary loop and the secondary loop.
■Processing operation
: Performed, : Not performed
Control mode Processing operation
Engineering value
conversion

MAN, CMV

AUT, CAS, CSV
*1 Tracking to a selected loop and a non-selected loop is performed when the tracking flag (TRK) is 1.
*2 Tracking to a non-selected loop is performed when the tracking flag (TRK) is 1.
Tracking to a selected loop is performed when DMLA, MHA, or MLA of the alarm (ALM) has occurred.
*3 An alarm (ALM) whose corresponding bit is TRUE (detected) is reset, and the alarm will not be detected.
*4 An alarm whose corresponding bit is TRUE (Valid) in the disable alarm detection (INH) is not detected.
Operation error
Error code (SD0) Description
3400H An invalid operation (such as division by zero) is performed.
3402H Input data (CASIN_T1, CASIN_T2, MV), tag data, or operation constant (RH, RL, NMAX, NMIN) is a subnormal number or NaN (not
a number).
3403H An overflow has occurred.
SELECT SVPTN_B5
FALSE
TRUE TRUE
FALSE
TRUE or FALSE
SELECT SVPTN_B5
FALSE TRUE
FALSE
TRUE
TRUE or FALSE
Variation rate & Output conversion
high/low limiter
 
 
10.29 Loop Selector (Enable Tracking from secondary loop to primary loop) (M+P_SEL_T3_)
Result
TRUE or FALSE 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.
TRUE or FALSE The input variable CASIN_T2 is tracked.
The input variable CASIN_T2 is not tracked.
Tracking
*1

*2

10 LOOP CONTROL OPERATION
10
Alarm
*3

*4

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