Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 193
Logic Functions Chapter 7
Less Than
A Less Than test condition arms the setpoint for activation when the monitored
value is less than the threshold, and dis-arms the setpoint when the value is
greater than the threshold plus hysteresis. Figure 35
illustrates this test condition.
In Figure 35
, the setpoint is armed at point A, dis-armed at point B, and armed at
point C. Points d and f also arm the setpoint but the value increase above the
threshold at points e and g before the assert delay time passes.
Figure 35 - Less Than Test Condition
Threshold
Assert
Delay
Deassert
Delay
Setpoint
Status
Assert
Delay
1
0
Selected
Parameter
A
B
C
a
b
c
d
ef
g
Hysteresis
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