Lenze 8400 TopLine - Manual (Page 1417)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
1417
19 Function library
19.1 Function blocks
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
19.1.26.3 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.
[19-10] 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.
[19-11] 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