Mitsubishi Electric FX3G SERIES Programming Manual page 353

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

When the current value of the high-speed counter C255 changes from "99" to "100" or from "101" to "100", Y010 is set

to ON (output refresh).

Related instructions

The following instructions can be combined with high-speed counters:

1. Selection of the count comparison method

When the HSCS instruction is used in FX

C240, C244 (OP), C245 (OP), C246, C248 (OP), C251 and C253) are automatically switched to software

counters, and the maximum frequency and total frequency of each counter are affected.

Refer to the counting operation described below, and select according to the contents of control whether to use

HSCS instruction or general-purpose comparison instruction.

a) Case to select DHSCS instruction

When the output should be given when the counting result becomes equivalent to the comparison value

regardless of the scan time of the PLC

b) Cases to select a general-purpose comparison instruction

When the frequency is beyond the counting performance of software counters (and below the counting

performance of hardware counters)

When counting is regarded as important, but the effect of the scan time can be ignored in operations

according to the counting result

When the number of an instruction is more than 32

K2,147,483,647

High-speed counter set

High-speed counter reset

High-speed counter zone compare

High-speed counter move

High-speed counter compare with data table

13 High-Speed Processing – FNC 50 to FNC 59

13.4 FNC 53 – HSCS / High-Speed Counter Set

Instruction name

PLCs, hardware counters (C235, C236, C237, C238, C239,

Fx3u series Fx3uc series