KEYENCE Visual KV Series - Manual (Page 312)

6.2 High-speed Counters
KV
-300
KV-10/80
3-288
6
Chapter 6 Interrupts, High-speed Counters, Positioning Control
When start/stop of clock pulse is controlled by the input relay which enables/
disables the high-speed counter, response relay of up to 1 scan is generated
at start. Also, the same response relay is generated at stop, which may stop
clock pulse output while the output relay is still ON.
This controls clock pulse so that it always starts and stops when 2105 turns OFF.
Turn ON/OFF special utility relay 2105 as required to enable or disable output of
direct clock pulses using one of the external clocks. Use SET and RES instructions
together or only KEEP instruction to turn ON/OFF this relay.
The diagram below can be added to the sample diagram so that direct clock pulses
are output through 0500 only when 0000 is ON.
By overwriting the setting value of high-speed counter comparator CTC0 using the
LDA and STA instructions, you can change the clock pulse cycle (frequency).
➮ Refer to "Example of pulse output "on page 3-293.
CAUTION
Programming example
2008
SET
2103 2104 2105 2106
2002
0001
0002
0003 2101
RES RES SET RES
CTH0
CTC0
#00050
0004
0005
RES
2108 2109 2110 2111 CTH0
SET RES RES RES
2107
CTC1
#00020
CTH0 value
ON
OFF
CTC0
CTC1
• The status of output 0500 is set by turning ON one of the relays 2104 to 2107
and 2108 to 2111 at the beginning of the program. In Example, output of direct
clock pulses to 0500 is enabled, and the status of output 0500 is turned ON at
CTC0 and is turned OFF at CTC1.
• Turns ON special utility relay 2103 and specifies to clear CTH0 using CTC0. The
program repeats clearing the CTH0 current value with the value set to CTC0.
• Input relay which enables CTH0 remains ON during clock pulse output.
Coding
Line No. Instruction Operand Line No. Instruction Operand
0000 LD 2008 0013 CON
0001 MPS 0014 SET 2109
0002 SET 2103 0015 CON
0003 CON 0016 RES 2110
0004 RES 2104 0017 CON
0005 CON 0018 RES 2111
0006 RES 2105 0019 CON
0007 CON 0020 RES CTH0
0008 SET 2106 0021 LD 2002
0009 CON 0022 CTH 0 2101
0010 RES 2107 0023 CTC 0 #00050
0011 MPP 0024 CTC 1 #00020
0012 RES 2108
0000 2105
0000
SET
2105
RES
0000
2105
0000
SET
RES
KEEP
KEEP Instructions SET/RES Instructions
KVNKA Chap 06.p65 08.3.11, 0:10 PM 288