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17
Function library
17.1
Function blocks | L_ComparePhi_1
1285
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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17.1.28.3 Function 3: dnIn1 < dnIn2
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.
[17-16] Function 3: Switching performance
Functional sequence
1. If the value at
dnIn1_p
falls below the value at
dnIn2_p
,
bOut
changes from FALSE to TRUE.
2. Only if the signal at
dnIn1_p
exceeds the value of
dnIn2_p
-
hysteresis
again,
bOut
changes back
from TRUE to FALSE.
[17-17] Function 3: Example
: Hysteresis
TRUE
FALSE
bOut
dnIn2_p
dnIn1_p
: Hysteresis
dnIn1_p
dnIn2_p
TRUE
FALSE
bOut
t
t