Visual kv series – KEYENCE Visual KV Series User Manual
Page 269
4.7 Examples of Direct Clock Pulse Output
3-245
Visual KV
Series
1
4
Chapter 4 High-speed Counters
2103
SET
2104
RES
2105
RES
2106
SET
2107
RES
2108
RES
2109
SET
2110
RES
2111
RES
CTH0
RES
2008
2002
#00050
CTC0
#00020
CTC1
CTH0
2101
0001
0002
0003
0004
0005
CTC0
CTC1
ON
ON
ON
ON
4.7.2
Example of Outputting a Pulse with Variable ON/OFF
Ratio
To output a clock pulse of 500 µs (2 kHz)-period and 200 µs-width from output relay 0500
This section describes a programming example that will output a clock pulse with
variable ON/OFF ratio from output relay 0500 by using the high-speed counter
(CTH0) and high-speed counter comparator (CTC0 and CTC1).
■ Special utility relay setting
Set the special utility relay (2103 through 2112) according to the following table.
■ Internal clock and CTC0/CTC1 preset values
Specify the internal clock and calculate the preset values of CTC0 and CTC1 for the
clock.
CTC1 preset value = Pulse width (µs) ÷ Internal clock (µs)
CTC0 preset value = Pulse period (µs) ÷ Internal clock (µs)
Obtain the preset values of CTC0 and CTC1 by substituting 200 µs for the pulse
width, 500 µs for the pulse period, and 10 µs for the internal clock (special utility
relay 2101).
In this case, the preset value of CTC1 is "20", and that of CTC0 is "50".
Refer to the following table for the CTC preset values with other internal clocks.
■ Example
Count value
•
Sets the pulse output from output relay 0500 with special utility relays 2104 through 2107
and 2108 through 2111.
In this example, turns OFF 2104 to enable direct output from 0500. Turns ON 2106 to turn
ON the output from 0500 when the CTH0 value reaches the CTC0 value, and turns ON
2109 to turn OFF the output when the CTH0 value reaches the CTC1 value.
•
Turns ON 2103 to set CTH0 to be cleared when its value reaches the CTC0 value. This
ensures that the first clock pulse is output at the proper pulse width.
•
Turn ON the input enable relay for CTH0 all the time when CTH0 is used to output the
clock pulse.
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