Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 222

■Derivative stop
This function block stops a derivative element operation.
Condition
DSTP = TRUE
DSTP = FALSE
■Integration stop at MV variation rate limiter occurrence
This function block stops an integral element operation when an MV variation rate limiter alarm occurs.
Condition
When LMT_ISTP is TRUE and a DMLA alarm has
occurred
LMT_ISTP = FALSE
■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.
10 LOOP CONTROL OPERATION
220
10.7 2-degree-of-freedom Advanced PID Control (Enable Tracking for primary loop) (M+P_2PIDH_T_)
Processing
The derivative element operation is stopped.
Non-processing
Processing
When the variation rate of a manipulated value has exceeded a positive/negative limit value and the
sign (positive/negative) of an integral operation value is the same as that of the limit value, the
integral element operation is stopped.
Non-processing
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



