Lenze 8400 - Manual (Page 1187)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
1187
18 Function library
18.1 Function blocks | L_Compare_1
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18.1.23.3 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.
[18-10] 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.
[18-11] 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