Function blocks
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www.EatonElectrical.com
MN05013005E
193
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 counters
EZD 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 hardwired to the digital inputs I1 to I4.
The CF.. frequency counters operate independently of 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 on the input are counted for one second
irrespective of the cycle time, and the frequency is
determined. The result of the measurement is made available
as a value to the function block output CF..QV.
Wiring of a counter
The following assignment of the digital inputs apply.
• I1 counter input for the counter CF01
• I2 counter input for the counter CF02
• I3 counter input for the counter CF03
• I4 counter input for the counter CF04