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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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17
Function library
17.1
Function blocks | L_Compare_1
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17.1.23.3 Function 3: nIn1 < nIn2
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.
[17-10] Function 3: Switching performance
Functional sequence
1. If the value at
nIn1_a
falls below the value at
nIn2_a
,
bOut
changes from FALSE to TRUE.
2. Only if the signal at
nIn1_a
exceeds the value of
nIn2_a
-
hysteresis
again,
bOut
changes back
from TRUE to FALSE.
[17-11] Function 3: Example
: Hysteresis
TRUE
FALSE
bOut
nIn2_a
nIn1_a
: Hysteresis
nIn1_a
nIn2_a
TRUE
FALSE
bOut
t
t