KEYENCE Visual KV Series - Manual (Page 274)

4.7 Examples of Direct Clock Pulse Output
3-250
Visual KV
Series
4
Chapter 4 High-speed Counters
• The input enable relay for CTH0 must be ON all the time when CTH0 is used to output the
clock pulse.
• The input enable relay for CTH1 must be ON all the time when CTH1 is used to count the
clock pulse.
• Specifies the internal clock (2101) as the clock input for CTH0. Specifies 0500 as the
clock input for CTH1. With this setting, CTH0 is used to output the clock pulse, and CTH1
is used to count the clock pulse.
• Specifies the number of clock pulses to the CTC2 preset value.
• The clock pulse output starts when input 0000 is turned ON.
To restart the clock pulse output after it stops, turn ON input 0000 again.
Coding
■ Tips
Special utility relays 2103 through 2111 can be turned ON/OFF by using the LDA
and STA instructions instead of the SET-RES instructions.
The example program below can be changed as follows by using the LDA and STA
instructions. The number of lines and steps can be reduced.
• LDA $0268
When LDA $0268 is executed, the value specified by the operand is written into
the internal register as follows.
When STA 2100 is executed, the value in the internal register is assigned to
special utility relays 2100 through 2115.
Line No. Instruction Operand Line No. Instruction Operand
0000 LD 2008 0024 SET 2203
0001 EI 0025 CON
0002 CON 0026 DW #00000 DM1940
0003 MPS 0027 CON
0004 SET 2103 0028 SET 2813
0005 CON 0029 CON
0006 RES 2104 0030 RES CTH1
0007 CON 0031 LD 0000
0008 SET 2105 0032 DIFU 1000
0009 CON 0033 CON
0010 SET 2106 0034 AND 1000
0011 CON 0035 RES 2105
0012 RES 2107 0036 LD 2002
0013 MRD 0037 CTH 0 2101
0014 RES 2108 0038 CTC 0 #00050
0015 CON 0039 CTC 1 #00020
0016 SET 2109 0040 LD 2002
0017 CON 0041 CTH 1 0500
0018 RES 2110 0042 CTC 2 #10000
0019 CON 0043 END
0020 RES 2111 0044 INT CTC2
0021 CON 0045 LD 2002
0022 RES CTH0 0046 SET 2105
0023 MPP 0047 RET1
0048 ENDH
0 0
[0] [2] [6] [8]
0 0 0 0 1 0 0 1 1 0 1 0 0 0
Internal register
0
15 xx 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
0 0 0 0 0 1 0 0 1 1 0 1 0 0 0
Special utility
relay 21xx
2109
SET
2110
RES
2111
RES
CTH0
RES
2203
SET
2813
SET
CTH1
RES
2104
RES
2105
SET
2106
SET
2107
RES
2108
RES
2103
SET EI
2008 2100
STA
CTH0
RES
2203
SET
2813
SET
CTH1
RES
$0268
LDA EI
2008
KVNKA Chap 04_2.p65 08.3.11, 0:08 PM 250