Lenze E94A - Manual (Page 555)

Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
555
5 Function blocks
5.160 L_TbCompare - comparison
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5.160.2 Function 2: dnIn1 > dnIn2
Selection: C04085 = "1"
• This function serves, for instance, to implement the comparison "actual speed is higher than a
limit value" (n
act
> n
x
) for one direction of rotation.
[5-115] Function 2: Switching performance
Functional sequence
1. If the value at dnIn1 exceeds the value at dnIn2, bOut changes from FALSE to TRUE.
2. Only if the signal at dnIn1 falls below the value at dnIn2 - dnHysteresis again, bOut changes from
TRUE to FALSE.
[5-116] Function 2: Example
TRUE
FALSE
bOut
dnHysteresis
dnIn2
dnIn1
dnIn1
dnIn2
dnHysteresis
TRUE
FALSE
bOut
t
t