Mitsubishi FX Programmable Logic Controllers, 2nd Edition

//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH023.3D – 247 – [247–264/18]

19.6.2004 9:18PM

23

High-speed counters

23.1 Introduction

A high-speed counter would be used, when it is necessary to count a high-frequency

input signal, which is coming, for example, from an encoder disk.

These high-frequency signals can be counted by feeding the signals into the Inputs

X0–X5 and using the high-speed 32-bit Counters C235–C255.

Using either Input X0 or X1 it is possible to use to count input signals whose frequency

can be up to 60 kHz, while the other inputs X2–X5 can count input signals up to 10 kHz.

All X Inputs, other than X0–X7, have a fixed input filter time of 10 msec, whilst each

of the Inputs X0–X7 has a programmable input filter, ...