Function library
7-144
L
EDSVS9332P-D21 EN 3.0
Function
The description is an example for CMP1 and also applies to CMP2 and CMP3.
The function of these FBs can be set via code C0680 (CMP1). The following comparison operations
are available:
•
CMP1-IN1 = CMP1-IN2
•
CMP1-IN1 > CMP1-IN2
•
CMP1-IN1 < CMP1-IN2
•
|CMP1-IN1| = |CMP1-IN2|
•
|CMP1-IN1| > |CMP1-IN2|
•
|CMP1-IN1| < |CMP1-IN2|
7.5.32.1 Function 1: CMP1-IN1 = CMP1-IN2
This function is used to find out whether two signals are equal.
•
Via code C0682 the window of equality can be set.
•
Via code C0681 a hysteresis can be set if the input signals are not stable which results in an
oscillation of the output.
The exact function can be obtained from the line diagram.
C0682
C0682
1
0
CMP1--IN2
CMP1--IN1
C0681
C0681
CMP1--IN2
C0681
C0682
C0681
C0682
CMP1--IN1
CMP1--OUT
t
t
Fig. 7-98 Equality of signals (CMP1-IN1 = CMP1-IN2)
Example:
This function can be used to obtain the comparison ”Actual speed is equal to setpoint speed
(n
act
=n
set
)”.
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