KEYENCE Visual KV Series - Manual (Page 230)

4.2 Outline of High-speed Counters
3-206
Visual KV
Series
4
Chapter 4 High-speed Counters
4.2 Outline of High-speed Counters
This section describes the outline and specifications for high-speed counters and
high-speed counter comparators featured with the Visual KV Series.
4.2.1 High-speed Counters and High-speed Counter Compara-
tors
The high-speed counter is a hardware-based counter that can count high-speed
pulses that cannot be counted by counters written in main routines (C or UDC).
(Pulses with a maximum frequency of 30 kHz can be counted.). *
High-speed counter comparators are hardware-based comparators that compare
their preset value with the current value of one of the a high-speed counters.
Both counters and comparators perform processing with hardware rather than
software programs, enabling high-speed performance independent of the scan time.
Structure of high-speed counters and high-speed counter comparators
The Visual KV PLC has two high-speed counters, each equipped with two high-
speed counter comparators and dedicated internal clocks.
Block diagram of high-speed counters
1. With the KV-10xx, the external input relay for CTH0 is 0004 (phase A)/0000
(phase B), and for CTH1 is 0005 (phase A)/0001 (phase B).
2. With the KV-10xx, the preset input relay for CTH0 is 0002, and for CTH1 is 0003.
For KV-10/80 user's
Max. response frequency: 10 kHz
*
2100 0.8 µs
2101 6.4 µs
2102 102.4 µs
2200 0.4 µs
2201 0.8 µs
2202 3.2 µs
CTC2
CTH1
CTC3
DM1932, DM1933(INT2)
DM1934, DM1935(INT3) 2203 to 2214
INT CTC2
INT CTC3
2200 (1.0 µs)
2201 (10.0 µs)
2202 (100.0µs)
0500
0005/0007
CTC0
CTH0
CTC1
DM1928, DM1929(INT0)
DM1930, DM1931(INT1) 2103 to 2114
INT CTC0
INT CTC1
2100 (1.0 µs)
2101 (10.0 µs)
2102 (100.0 µs)
0004/0006
0005
(0007)
0004
(0006)
0008 (RESET) 2.
0009 (RESET) 2.
0500
0501
Phase A
Phase B
Internal clocks*
External input
16-bit high-speed
counter
high-speed
counter
comparator high-speed
counter
comparator
Input capture device Special utility relay
Control circuit
Input capture device Internal clocks*
External input
16-bit high-speed
counter
high-speed
counter
comparator high-speed
counter
comparator
Special utility relay
Control circuit
Phase A
Phase B
Internal connection
for external clock
KVNKA Chap 04_1.p65 08.3.11, 0:06 PM 206