KEYENCE Visual KV Series - Manual (Page 234)

4.2 Outline of High-speed Counters
3-210
Visual KV
Series
4
Chapter 4 High-speed Counters
4.2.2 Internal Clock for High-speed Counters
• Each high-speed counter (CTH) is equipped with a dedicated internal clock.
• To use the internal clock, specify the appropriate relay No. as an operand for the
CTH instruction.
• The internal clock or external pulses cannot be changed during program execu-
tion.
• Each clock has the following count period:
High-speed counter internal clock error
•
Absolute error: ± 200 ppm
• Temperature coefficient: 00
• Relative error between CTH0 and CTH1: ± 0
r e t n u o c d e e p s - h g i H 0 H T C 1 H T C d o i r e P
. o N y a l e R
0 0 1 2 0 0 2 2 0 . 1 µs
1 0 1 2 1 0 2 2 0 . 0 1 µs
2 0 1 2 2 0 2 2 0 . 0 0 1 µs
KVNKA Chap 04_1.p65 08.3.11, 0:06 PM 210