KEYENCE Visual KV Series - Manual (Page 256)

4.5 Special Functions Using High-speed Counters
3-232
Visual KV
Series
4
Chapter 4 High-speed Counters
4.5.4 Applications of Frequency Counters
Program for basic operation of the frequency counter
Stores the frequency of pulses at input relay 0004 to DM0000 every second (1000
ms). (Unit: Hz)
1) Sets the counting period to "1000 ms (1 second)" and turns ON special utility
relay 2305 to start the frequency counter function.
2) Sets the input time constant for input relay 0004 to 10 µs.
3) Stores the measured frequency (Hz) into data memory DM0000.
Program for synchronous control
The following ladder program illustrates synchronous control using the frequency
counter and pulse output functions.
Measures the frequency of pulses at input relay 0004 every 100 ms and outputs
pulses of the same frequency from output relay 0501.
1) Sets the counting period to "100 ms" and turns ON special utility relays 2305 and
2306 to start the frequency counter and the specified frequency pulse output
functions.
2) Sets the input time constant for input relay 0004 to 10 µs.
3) Uses the measured frequency (Hz) as the preset value for the output frequency
(Hz).
4) Turns on output relay 0500 when an error occurs in the setting of the specified
frequency pulse output.
0001
2008
0003
2002
2002
0004
0002
#01000
LDA
DM1404
STA
END
0005
ENDH
2305
SET
DM1405
LDA
DM0000
STA
HSP
0004
1)
2)
3)
0001
2008
0003
2002
2002
0004
0002
#00100
LDA
DM1404
STA
2307
END
0005
0006
ENDH
2305
SET
2306
SET
DM1405
LDA
DM1936
STA
HSP
0004
0500
1)
2)
3)
4)
KVNKA Chap 04_2.p65 08.3.11, 0:08 PM 232