ABB CL Series Applications Manual page 127

Wiring with the logic relay
124
Example: Frequency counter
Frequency counters with different switch points
The frequency measured at input I3 is to be classified in
different value ranges. The analog value comparator is used
as an additional comparison option.
The counter is enabled via the marker N3. The value 900 or
higher is detected by frequency counter C15 as the upper
limit value. This triggers the coil of marker N4.
If the frequency is higher than 600 Hz, analog value
comparator A1 indicates this and triggers marker N5.
If the frequency is higher than 400 Hz, analog value
comparator A2 indicates this and triggers marker N6.
Circuit diagram display
N3-------CC1 5
C1 5-------ÄN4
A1-------ÄN5
A2-------ÄN6
Parameter settings of the
analog value comparator A1
A1 GE +
I1 C1 5 Æ
F1 +0
I2 0600 æ
F2 +0
OS +0
HY +0
1SVC 440 795 M0100
Parameter settings of the
counter C15
C1 5 F +
S 00900
Parameter settings of the
analog value comparator A2
A2 GE +
I1 C15 Æ
F1 +0
I2 0400 æ
F2 +0
OS +0
HY +0