KEYENCE Visual KV Series - Manual (Page 227)

Chapter 4
High-speed Counters
This chapter describes high-speed counters and high-speed counter comparators,
which allow high-speed pulse measurement and pulse output, independent of the
scan time.
➮ For KV-10/80 Series, see Chapter 6.
4.1 High-speed Counter Instructions ................................................ 3-204
4.2 Outline of High-speed Counters .................................................. 3-206
4.2.1 High-speed Counters and High-speed Counter Comparators ............... 3-206
4.2.2 Internal Clock for High-speed Counters ................................................. 3-210
4.3 Setting and Operation of High-speed Counters ...................... 3-211
4.3.1 Reading the Current Value of the High-speed Counter ......................... 3-211
4.3.2 Preset Value of the High-speed Counter Comparator ........................... 3-211
4.3.3 Comparator Output ................................................................................ 3-211
4.3.4 Count Input Method ................................................................................ 3-212
4.3.5 Resetting the High-speed Counter ......................................................... 3-214
4.3.6 Differences with the CTH Instruction between the
Conventional and Visual KV Series ....................................................... 3-216
4.3.7 Applications of High-speed Counters ..................................................... 3-217
4.4 Expanded Functions of High-speed Counters ......................... 3-221
4.4.1 24-bit High-speed Counter ..................................................................... 3-221
4.4.2 Changing the Current Value of a 24-bit High-speed Counter ................ 3-223
4.4.3 Application Example of 24-bit High-speed Counter (single-phase input) 3-224
4.4.4 Ring Counter Function ........................................................................... 3-225
4.4.5 Applications of Ring Counters ................................................................ 3-226
4.5 Special Functions Using High-speed Counters ...................... 3-228
4.5.1 Specified Frequency Pulse Output Function .......................................... 3-228
4.5.2 Applications of the Specified Frequency Pulse Output .......................... 3-229
4.5.3 Frequency Counter Function .................................................................. 3-231
4.5.4 Applications of Frequency Counters ...................................................... 3-232
4.5.5 Cam Switch Function ............................................................................. 3-233
4.5.6 Application of the Cam Switch ............................................................... 3-236
4.6 Direct Clock Pulse Output ............................................................. 3-237
4.6.1 Outline of Direct Clock Pulse Output ...................................................... 3-237
4.6.2 Pulse Output Setting with the High-speed Counter Comparator ............ 3-238
4.7 Examples of Direct Clock Pulse Output .................................... 3-242
4.7.1 Example of Outputting a Pulse with 1:1 ON/OFF Ratio ......................... 3-242
4.7.2 Example of Outputting a Pulse with Variable ON/OFF Ratio ................. 3-245
4.7.3 Example of Stopping the Pulse Output at a Specified Pulse Count ....... 3-249
4.7.4 Application of Direct Clock Pulse Output (Ramp-up/down control) ........ 3-251
Visual KV
Series
KVNKA Chap 04_1.p65 08.3.11, 0:06 PM 203