Lenze 8400 - Manual (Page 1195)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
1195
18 Function library
18.1 Function blocks | L_ComparePhi_1
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18.1.28.2 Function 2: dnIn1 > dnIn2
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.
[18-14] Function 2: Switching performance
Functional sequence
1. If the value at dnIn1_p exceeds the value at dnIn2_p, bOut changes from FALSE to TRUE.
2. Only if the signal at dnIn1_p falls below the value of dnIn2_p - hysteresis again, bOut changes
back from TRUE to FALSE.
[18-15] Function 2: Example
 C001671 : Hysteresis
TRUE
FALSE
bOut
dnIn2_p
dnIn1_p
Œ
 C001671 : Hysteresis
dnIn1_p
dnIn2_p
TRUE
FALSE
bOut
t
t
Œ