Examples Of Practical Programs (Programs To Measure Short Pulse Width) - Mitsubishi Electric FX3G SERIES Programming Manual

Programmable controllers

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Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Examples of practical programs (programs to measure short pulse width)

By using a 1 ms retentive type timer or the special data register D8099 (high-speed ring counter), the short pulse width

can be measured in 1 ms or 0.1 ms units.

1. Example of program to measure the short pulse width using a retentive type 1ms timer

PLC(sink input)

S/S X000 X001

When the rising edge of

X000 is detected

When the falling edge of

X001 is detected

36.3 Input Interrupt (Interrupt Triggered by External Signal) [Without Delay Function]

X010:Preparation

for measurement

SW(X000,X001)

Interrupts are enabled by the EI instruction.

The main program is described.

The main program is finished by the FEND

instruction.

When X000 turns ON, the 1 ms timer

T246 is started up by the interrupt I001.

Timer is driven

Measurement data

When X001 turns OFF, the current value

of T246 is transferred to the data register

D0 for storing the measured value by the

interrupt I100, and M0 for the complete

signal is set to ON.

is completed

Timer is stopped

"T246" is set to OFF, and the timer is

36 Interrupt Function and Pulse Catch Function

This period of time is measured.

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