Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 125

Processing details
■High/low limiter processing
This function block applies high/low limiters with hysteresis to the value input from the input variable IN and outputs the result
from the output variable OUT_.
Input (IN)
Input (IN)
Output (OUT_)
(broken line)
HILMT
LOLMT
High and low
limit detection
OUT_
HILMT
LOLMT
HS2
LOLMT
HS2
IN: Input value
OUT_: Output value
HILMT: High limit value
LOLMT: Low limit value
HS1: High limit hysteresis
HS2: Low limit hysteresis
Input (IN)
IN  HILMT
LOLMT + HS2 < IN < HILMT - HS1
IN  LOLMT
Others
Set the high limit value (HILMT) and low limit value (LOLMT) in such a way that HILMT equals to or exceeds LOLMT.
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
Output(OUT_)
(solid line)
High limit over detection
HS1
HS1
HILMT
Output (OUT_)
HILMT
IN
LOLMT
IN
HS1
HS2
Low limit over
detection
IN
High limit over detection(H_)
Low limit over detection(L_)
High limit over detection (H_)
TRUE (Detected)
FALSE (Canceled)
FALSE (Canceled)
Last value
Result
Normal
Operation error
8.5 High/Low Limiter (M+P_LIMT)
t
t
Low limit over detection (L_)
FALSE (Canceled)
FALSE (Canceled)
TRUE (Detected)
Last value
8 CONTROL OPERATION
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