Function blocks
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MN05013005E
197
• The first measurements are made after the CF..EN enable signal
has been activated. The value is output after the gate time has
timed out.
• The contacts are set in accordance with the measured frequency.
• If the CF..EN enable signal is removed, the output value is set to
zero.
High-speed counters
EZD provides four high-speed up/down counters CH01 to
CH04 for use. The high-speed frequency counters are
hardwired to the digital inputs I1 to I4. These counter relays
allow you to count events independently of the cycle time. You
can enter upper and lower threshold values as comparison
values. The contacts will switch according to the actual value.
To specify a start value, for example, counting from the value
1989, this can be implemented using a CH .. counter.
The CH.. counters operate independently of the cycle time.
Counter frequency and pulse shape
The maximum counter frequency is 3 kHz.
The signals must be square waves. The mark-to-space ratio
is 1:1.
Wiring of a counter
The following assignment of the digital inputs apply.
• I1 counter input for the counter CH01
• I2 counter input for the counter CH02
• I3 counter input for the counter CH03
• I4 counter input for the counter CH04
You integrate a counter into your circuit in the form of a
contact and coil. The counter relay has different coils and
contacts.
J
To prevent unpredictable switching states, use each coil of
a relay once only in the circuit diagram. Use a counter input
for the CF, CH, CI counters only once.
