KEYENCE Visual KV Series - Manual (Page 302)

6.2 High-speed Counters
KV
-300
KV-10/80
3-278
6
Chapter 6 Interrupts, High-speed Counters, Positioning Control
■ High-speed counter and counter comparators
High-speed counter (CTH1)
CTH1 is a 16-bit hardware counter that counts from 0 to 65535.
• You can specify the operands listed in the table below as the count input.
• You can specify one operand from the table below.
• Operand cannot be modified externally during execution of the program.
• When the external pulse (0004, 0005) is selected, CTH1 is used as a High-speed
counter with a response frequency of 30 kHz.*
• When one of the internal clocks (2100 to 2102, 2200 to 2202) is selected, CTH1
is used as a High-speed timer.
• When the external pulse 0500 is selected as input to CTH1, CTH1 can count
direct clock pulses generated by CTH0.
* KV-10/80: 10 kHz
■ High-speed counter comparator (CTC)
High-speed counter comparators (CTC) is used only for High-speed counters (CTH).
When the current value of CTH reaches the preset value of one of the comparators
(CTC), the comparator turns ON.
At the contact of High-speed counter comparator (CTC), the level of output (0500,
0501) can be changed (directly output) through hardware or an interrupt can be
generated. To change the level of output 0500 and 0501, set the desired value (ON/
OFF) to special utility relays 2103 to 2112, 2203 to 2205, and 2207 to 2212.
The High-speed counters correspond to the High-speed counter comparators as
shown in the table below.
Internal Clocks for CTH0 and CTH1
• Each High-speed counter (CTH) has its own internal clock.
• The desired clock can be selected by specifying the relay No. as operand for
CTH instruction.
• You cannot change the internal clock or external pulse during execution of the
program.
• Each clock has the following period:
High-speed counter CTH0 CTH1
Operand 2100 2200
2101 2201
2102 2202
0004 0005
0500
Countable range 0 to 65535
High-speed High-speed Range of Output Interrupt
counter counter setting value
comparator
CTH0 CTC0 0 TO 65535 0500 INT CTC0
CTC1 INT CTC1
CTH1 CTC2 0501 INT CTC2
CTC3 INT CTC3
High-speed counter CTH0 CTH1 Period
Relay No. 2100 2200 1.0 µs
2101 2201 10.0 µs
2102 2202 100.0 µs
KVNKA Chap 06.p65 08.3.11, 0:10 PM 278