Mitsubishi Electric FX3G SERIES Programming Manual page 823

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

The ring counter offers 32-bit data including the most significant bit.

The DSUB (FNC21) instruction does not give a correct value because it handles the most significant bit as the

sign bit. To obtain a correct value, add the processing inside the dotted frame.

2. Cautions on use

• The pulse width/pulse period measurement function and input interrupts can be used at the same time in the same

input terminal.

• When the same input terminal is used by the pulse width/pulse period measurement function and the SPD

(FNC56), DSZR (FNC150) or ZRN (FNC156) instruction, an operation error occurs when the instruction is

• The input terminal used for the pulse width/pulse period measurement function cannot be used for the pulse catch

• When the same input terminal is used by the pulse width/pulse period measurement function and a high-speed

counter, a grammatical error occurs.

• Make sure that the total frequency of four input channels is 50 kHz or less when using the pulse width/pulse period

measurement function.

• When the pulse width/pulse period measurement function and a high-speed counter are used together, the overall

frequency of the high-speed counter is affected.

36 Interrupt Function and Pulse Catch Function

36.8 Pulse width/Pulse period measurement function [M8075 to M8079, D8074 to D8097]

→ For details on high-speed counters, refer to Subsection 4.8.7.

Fx3u series Fx3uc series