Lenze 8400 StateLine - Manual (Page 924)

17 Function library
17.1 Function blocks
924
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
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17.1.11.3 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.
[17-8] 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.
[17-9] Function 3: Example
 C00681 : Hysteresis
TRUE
FALSE
bOut
nIn2_a
nIn1_a
Œ
 C00681 : Hysteresis
nIn1_a
nIn2_a
TRUE
FALSE
bOut
t
t
Œ