KEYENCE Visual KV Series - Manual (Page 303)

6.2 High-speed Counters
KV
-300
KV-10/80
3-279
1 6
Chapter 6 Interrupts, High-speed Counters, Positioning Control
• You cannot change operands of the high-speed counters (CTH) during
execution of the program. The input time constant of the high-speed
counters is usually set to 25 ms. (The HSP instruction is not required.)
• High-speed pulses can be counted at up to 30 kHz through external inputs
(0004 to 0007) by turning ON special utility relay 2813. (Internal pulses can
be counted at up to 50 kHz by turning ON 2813.)*
* KV-10/80 : 10 kHz
Outline of Pulse Output
The KV PLC can output clock pulses through 0500 and/or 0501 without any delays
caused by scan time. (Through CPU only)
Direct clock pulses, used with the high-speed counters, are applicable for various
types of production control such as for controlling target positions at desired speed.
To perform ramp-up/down control, see "Controlling stepping motors" in Chapter 5.
A setting of the clock pulse cycle (frequency) can be changed by the program within
the allowable range as shown in the table below.
Outline of pulse output
Direct clock pulses are output through 0500 and/or 0501 according to the settings on
the special utility relays when the number of internal clock pulses counted by the
high-speed counter reaches the preset value of the comparator.
Output example
ON/OFF of output relay 0500/0501 depends on the setting of the special utility
relay.
➮ Refer to page 3-281.
For KV-10/80 users
CAUTION
Output Internal clock Range of pulse cycle (frequency)
0500 2100 20 µs (50 kHz) to 65.5 ms (15 Hz)
2101 20 µs (50 kHz) to 655.3 ms (1.5 Hz)
2102 200 µs (5 kHz) to 6553.5 ms (0.1 Hz)
0501 2200 20 µs (50 kHz) to 65.5 ms (15 Hz)
2201 20 µs (50 kHz) to 655.3 ms (1.5 Hz)
2202 200 µs (5 kHz) to 6553.5 ms (0.1 Hz)
CTH current value (count value)
CTC preset value
ON
OFF
0500
0501
CAUTION
Model Output Range of pulse cycle
KV-10, 16, 24, 40 500 500 ms to 52.2 ms
(2 kHz to 19 Hz)
501 666 ms to 419.4 ms
(1.5 kHz to 2.4 Hz)
KV-80 500 50 ms to 52.2 ms
(20 kHz to 19 Hz)
501 666 ms to 419.4 ms
(1.5 kHz to 2.4 Hz)
KVNKA Chap 06.p65 08.3.11, 0:10 PM 279