Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 106

Processing details
■Comparison (<) processing
This function block compares (<) the value input from the input variable IN1 with the value input from the input variable IN2
using a setting value and hysteresis and outputs the comparison result from the output variable B_.
This function block always outputs values to the input variable IN1 from the output variable OUT_.
Input(IN1)
Input(IN2)
Comparison
output(B_)
TRUE
Condition
IN1 < IN2 + K_
IN1  IN2 + K_ + HS
IN2 + K_  IN1 < IN2 + K_ + HS
IN1: Input value 1
IN2: Input value 2
K_: Setting value
HS: Hysteresis
Operation error
Error code Description
(SD0)
3402H Input data (IN1, IN2) or operation constant (K_, HS) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H Hysteresis (HS) is less than 0.
7 COMPARISON OPERATION
104
7.2 Comparison (<) with setting value (M+P_LT)
Input(IN1)
Input(IN2)
TRUE
Comparison output (B_)
B_ = TRUE
B_ = FALSE
Last value
Hysteresis (HS)
Setting value (K_)
K_ is a negative number
in this example
t
t
Output (OUT_)
OUT_ = IN1