Lenze E94A - Manual (Page 556)

5 Function blocks
5.160 L_TbCompare - comparison
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Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.160.3 Function 3: dnIn1 < dnIn2
Selection: C04085 = "2"
• This function serves, for instance, to implement the comparison "actual speed is lower than a
limit value" (n
act
n
x
) for one direction of rotation.
[5-117] Function 3: Switching performance
Functional sequence
1. If the value at dnIn1 falls below the value at dnIn2, bOut_b changes from FALSE to TRUE.
2. Only if the signal at dnIn1 exceeds the value at dnIn2 - dnHysteresis again, bOut_b changes from
TRUE to FALSE.
[5-118] Function 3: Example
TRUE
FALSE
bOut
dnHysteresis
dnIn2
dnIn1
dnIn1
dnHysteresis
dnIn2
TRUE
FALSE
bOut
t
t