Eaton easy800, Руководство пользователя

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5 Function blocks
5.7 CF, frequency counter
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Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
5.7 CF, frequency counter
All devices with DC inputs except EASY802-DC-SWD contain CF function
blocks that enable frequency measurement independent of the cycle time.
4 frequency counters are provided. The digital inputs I1 to I4 are permanently
assigned to the frequency counter function blocks provided:
• I1: Counter input for counter CF01.
• I2: Counter input for counter CF02.
• I3: Counter input for counter CF03.
• I4: Counter input for counter CF04.
You can set a lower and higher limit setpoint comparison values for the
frequency counter function block.
The function block operates in the integer range from 4 to 5000
(1 kHz = 1000).
The value range cannot be exceeded as the maximum measured value is
less than the value range.
Contacts and Coils
Example of a frequency counter
Figure 113:Wiring the function block coils
The counter input of the function block CF01 is already permanently
connected to device input I1, the function of the function block is activated
by the device input I5.
Figure 114:Wiring the function block contacts
The messages of the function block are sent directly to the device outputs.
￫
Square wave count pulses are required to ensure a 1:1 mark to
space ratio.
Contacts Meaning
CF..OF
Reaching or exceeding the upper limit setpoint
CF..FB
Reaching or falling below the lower limit setpoint
CF..ZE
Actual value equals zero
Coils Function
CF..EN
Selective activation of the function block
I 05--------------------------- Ä CF01EN
CF01OF------------------------- Ä Q 01
CF01FB------------------------- Ä Q 02
CF01ZE------------------------- Ä Q 03