Lenze 8400 HighLine - Manual (Page 1275)

Lenze · 8400 HighLine · Referenzhandbuch · DMS 10.0 EN · 06/2014 · TD05/TD14
1275
17 Function library
17.1 Function blocks
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
17.1.28.3 Function 3: dnIn1 < dnIn2
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.
[17-16] Function 3: Switching performance
Functional sequence
1. If the value at dnIn1_p falls below the value at dnIn2_p, bOut changes from FALSE to TRUE.
2. Only if the signal at dnIn1_p exceeds the value of dnIn2_p - hysteresis again, bOut changes back
from TRUE to FALSE.
[17-17] Function 3: Example
 C001671 : Hysteresis
TRUE
FALSE
bOut
dnIn2_p
dnIn1_p
Œ
 C001671 : Hysteresis
dnIn1_p
dnIn2_p
TRUE
FALSE
bOut
t
t
Œ