Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 230

■Loop stop processing
When the stop alarm (SPA) of the alarm (ALM) or the tag stop (TSTP) of the monitor output buffer (DOM) 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. When DSVLA, SVLA, or SVHA of the alarm 2 (ALM2) has
occurred, the DSVLA, SVLA, or SVHA is reset.
• No alarm is detected in the deviation check or SV variation rate & high/low limiter processing.
■Processing operation
: Performed, : Not performed
Control Processing operation
mode
Deviation check

MAN, CMV

AUT

CAS, CSV

CASDR
Control Processing operation
mode
Auto tuning (AT2)

MAN, CMV

AUT

CAS, CSV

CASDR
*1 An alarm whose corresponding bit is TRUE (Valid) in the disable alarm detection (INH) is not detected.
*2 In the MAN mode, SV variation rate limiter processing is not performed.
*3 This processing is not performed when a sensor error (SEA) has occurred and output hold has been selected. SVC (setting value
(current)) is also not updated.
Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data, operation constant, tag data, or operation result within a function block is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The sampling interval time for AT1 (AT1ST) setting is less than 0.
The time-out interval for AT1 (AT1TOUT1) setting is less than 0.
The time-out interval after maximum slope for AT1 (AT1TOUT2) setting is less than 0.
The execution cycle (T) setting is less than 0.
The value divided the sampling interval time for AT1 (AT1ST) by the execution cycle (T) exceeds 32767.
The value divided the time-out interval for AT1 (AT1TOUT1) by the execution cycle (T) exceeds 32767.
The value divided the time-out interval after maximum slope for AT1 (AT1TOUT2) by the execution cycle (T) exceeds 32767.
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.
10 LOOP CONTROL OPERATION
228
10.8 2-degree-of-freedom Advanced PID Control (Disable Tracking for primary loop) (M+P_2PIDH_)
Two-degree-of- Engineering
freedom PID value conversion
operation
 
 
 
 
PV tracking




Inverse
engineering
value conversion




SV variation rate & Integration stop
high/low limiter
*2*3
 
*3
 
*3
 
 
Alarm Auto tuning (AT1)
*1
 
*1
 
*1
 
 
Derivative stop



