Function blocks
187
1SVC 440 795 M1100
Example: Function block list in the FUNCTION RELAYS menu:
CI01
CF01
CH01
All function blocks access digital input I1.
Only CH01 supplies the correct value.
Frequency counter
The display system provides four frequency counters which
are CF01 to CF04. The frequency counters can be used for
measuring frequencies. You can enter upper and lower
threshold values as comparison values. The high-speed
frequency counters are permanently connected to the digital
inputs I1 to I4.
The CF.. frequency counters are not dependent on the cycle
time.
Counter frequency and pulse shape
The maximum counter frequency is 3 kHz.
The minimum counter frequency is 4 Hz.
The signals must be square waves. The mark-to-space ratio
is 1:1.
Measurement method
The pulses at the input are counted for one second and the
frequency determined irrespective of the cycle time. The
measurement result is provided at the function block output
CF..QV.
Wiring of a counter
The following assignment of the digital inputs apply.
• I1 count input for counter CF01
• I2 count input for counter CF02
• I3 count input for counter CF03
• I4 count input for counter CF04
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