Lenze E94A - Manual (Page 559)

Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
559
5 Function blocks
5.161 L_TbCompare_n - scaled comparison
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5.161.1 Function 1: dnIn1_n = dnIn2_n
Selection: C04080 = "0"
• This function compares two signals with regard to equality. They can, for instance, provide the
comparison "actual speed equals setpoint speed " (n
act
= n
set
).
• Use C04081 to select the window within which the equality is to apply.
• Use C04082 to select a hysteresis if the input signals are not stable and the output oscillates.
[5-119] Function 1: Switching performance

Tip!
With this function, the FB must be used in a fast task to achieve optimum sampling of the
signals.
[5-120] Function 1: Example
TRUE
FALSE
bOut
C04081 C04081
C04082 C04082
dnIn2_n
dnIn1_n
dnIn1_n
C04082
C04081
dnIn2_n
C04081
C04082
TRUE
FALSE
bOut
t
t