Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 128

Processing details
■Variation rate limiter 1 processing
This function block limits the variation speed to the value input from the input variable IN and outputs the result from the output
variable OUT_.
• Positive direction
Input (IN_)
Output (OUT)
Positive
direction
TRUE
limit
(Occur)
(V1LMT)
• Positive direction IN  OUT_
Input (IN-OUT_)
IN - OUT_  V1_  T
IN - OUT_ < V1_  T - HS1
Others
• Negative direction IN < OUT_
Input (IN-OUT_)
OUT_ - IN  V2_  T
OUT_ - IN < V2_  T - HS2
Others
T: Execution cycle
IN: Input value
OUT_: Output value
V1_: Positive direction limit value (/s)
V2_: Negative direction limit value (/s)
HS1: Positive direction hysteresis
HS2: Negative direction hysteresis
When HS1 is less than 0 or HS2 is less than 0, an operation error occurs.
Condition
HS1  0 and HS2  0
HS1  0 and HS2 < 0
HS1 < 0 and HS2  0
HS1 < 0 and HS2 < 0
8 CONTROL OPERATION
126
8.6 Variation Rate Limiter 1 (M+P_VLMT1)
t
t
Output (OUT_)
OUT_ = OUT_ + V1_  T
OUT_ = IN
OUT_ = IN
Output (OUT_)
OUT_ = OUT_ - V2_  T
OUT_ = IN
OUT_ = IN
• Negative direction
Input (IN)
Output
(OUT_)
Negative
direction
TRUE
limit
(Occur)
(V2LMT)
Positive direction limit
(V1LMT)
TRUE (Detected)
FALSE (Canceled)
Last value
Positive direction limit
(V1LMT)
FALSE (Canceled)
FALSE (Canceled)
Last value
Result
Normal
Operation error
Operation error
Operation error
t
t
Negative direction limit
(V2LMT)
FALSE (Canceled)
FALSE (Canceled)
Last value
Negative direction limit
(V2LMT)
TRUE (Detected)
FALSE (Canceled)
Last value