Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 441

■Tracking processing
The following table shows whether tracking processing to the input variable CASIN_T is performed or not.
Condition
Tracking Flag (TRK)
1
0
■SV variation rate & high/low limiter
This function block checks the variation rate and high/low limits to the setting value of valve opening (target) (SV) every
execution cycle.
• Variation rate limiter
The SV variation rate high limit value input in percentage is processed.
Condition
|SV - SVC|  DSVL
SV - SVC > DSVL
SV - SVC < DSVL
SV: Setting value of valve opening (target), SVC: Setting value of valve opening (current)
• High/low limiter
When SVLMT_EN is TRUE
Condition
Variation rate limiter result > SH
Variation rate limiter result < SL
SL  Variation rate limiter result  SH
The high/low limiter result is stored in the setting value of valve opening (current) (SVC).
When SVLMT_EN is FALSE
The variation rate limiter result is stored in the setting value of valve opening (current) (SVC).
■Time-out detection/time-out reset
• Time-out detection
A time-out (TOA) of an alarm (ALM) will occur if TRUE is not input from the status answer input (OPEN_ST/CLOSE_ST) for a
time longer than the time set with the time-out timer (TOT) after a command signal (TRUE) is output from the output variable
OPEN or CLOSE.
Condition
Time to a status answer signal input  Time set with the time-out timer (TOT)
Time to a status answer signal input < Time set with the time-out timer (TOT)
• Time-out reset
A time-out (TOA) of an alarm (ALM) is reset (FALSE) by either of the following operations.
• A command pulse signal is output from the output variable (OPEN, CLOSE) by the operation with the faceplate or the input from the input variable
(OPEN_SET, CLOSE_SET).
• TRUE is input to the input variable (TO_RST).
Setting Value (SV) Used
(SVPTN_B0)
FALSE
TRUE
FALSE or TRUE
Variation rate limiter result
SV
SVC + DSVL
SVC - DSVL
High/low limiter result
SH
SL
Variation rate limiter result
Result
The input variable CASIN_T is tracked.
The input variable CASIN_T is not tracked.
Alarm 2 (ALM2) SV Variation Rate Limit
Alarm (DSVLA)
FALSE (Reset)
TRUE (Detected)
TRUE (Detected)
Alarm 2 (ALM2) SV Variation Rate Limit Alarm (DSVLA)
SV low limit (SVLA)
FALSE (Reset)
TRUE (Detected)
FALSE (Reset)
Alarm
Time-out (TOA)
TRUE (Detected)
FALSE (Reset)
12.39 Position Proportional Output (M+M_PVAL_T_)
SV high limit (SVHA)
TRUE (Detected)
FALSE (Reset)
FALSE (Reset)
12 LOOP TAG
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