KEYENCE Visual KV Series - Manual (Page 314)

6.2 High-speed Counters
KV
-300
KV-10/80
3-290
6
Chapter 6 Interrupts, High-speed Counters, Positioning Control
0000 2204
0000
SET
2204
RES
0000
2204
0000
SET
RES
KEEP
KEEP Instructions SET/RES Instructions
Relay No. Setting Relay No. Setting
2103 ON 2112 OFF
2104 OFF 2108 OFF
2105 OFF 2109 ON
2106 ON 2110 OFF
2107 OFF 2111 OFF
Special utility relay Internal clock* CTC0 value CTC1 value
2100 1.0 µs 500 200
2101 10.0 µs 50 20
2102 100.0 µs 5 2
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 the clock pulse so that it always starts and stops when 2205 turns
OFF.
Turn ON/OFF special utility relay 2205 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 0501 only when 0000 is ON.
By overwriting the setting value of high-speed counter comparator CTC2 using the
LDA and STA instructions, you can change the clock pulse cycle (frequency).
Example of stopping clock pulse after reaching the specified output pulse count
The following example stops clock pulse having the pulse width of 200 µs which is
output from 0500 at cycle of 500 µs (2 kHz) after reaching the pulse count value of
10000.
■ Setting special utility relay, internal clock, and CTC
Settings of the special utility relays, internal clock, CTC0, and CTC1 are listed
below.
CAUTION
Coding
Line No. Instruction Operand Line No. Instruction Operand
0000 LD 2008 0012 SET 2209
0001 MPS 0013 CON
0002 SET 2203 0014 RES 2210
0003 CON 0015 CON
0004 SET 2204 0016 RES 2211
0005 CON 0017 CON
0006 SET 2205 0018 RES CTH1
0007 CON 0019 LD 2002
0008 RES 2207 0020 CTH 1 2201
0009 MPP 0021 CTC 2 #00050
0010 RES 2208 0022 CTC 3 #00020
0011 CON
➮ *Refer to page 3-276.
KVNKA Chap 06.p65 08.3.11, 0:10 PM 290