Lenze E84DSxxx - Manual (Page 723)

Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
723
17 Function library
17.1 Function blocks | L_Compare_1
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17.1.10.2 Function 2: nIn1 > nIn2
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.
[17-6] Function 2: Switching performance
Functional sequence
1. If the value at nIn1_a exceeds the value nIn2_a, bOut changes from FALSE to TRUE.
2. Only if the signal at nIn1_a falls below the value of nIn2_a - hysteresis again, bOut changes back
from TRUE to FALSE.
[17-7] Function 2: Example
 C00681 : Hysteresis
TRUE
FALSE
bOut
nIn2_a
nIn1_a
Œ
 C00681 : Hysteresis
nIn1_a
nIn2_a
TRUE
FALSE
bOut
t
t
Œ