Mitsubishi Electronics FX5 User Manual

19  BUILT-IN I/O FUNCTION
19.3  Pulse Width Measurement Function

Details of special relays/special registers used in pulse width measurement are explained below.

This flag is a device for monitoring the measurement in progress/measurement stopped status of pulse width measurement.

■Corresponding devices

The device numbers corresponding to each channel are as follows.

■Update timing

This device turns ON when the HIOEN instruction is executed. It turns OFF at the END instruction when the measurement 
mode is the 1 time measurement mode.

■Clear timing

The timing when the device is cleared is as follows.
  • Power  OFF

ON

 • Reset
  • STOP/PAUSE

RUN

 • RUN

STOP/PAUSE

 • When measurement is stopped by the HIOEN instruction

This flag turns ON at the end of the 1st period measurement. During measurement in the always measurement mode, it stays 
ON.

■Corresponding devices

The device numbers corresponding to each channel are as follows.

■Update timing

Devices are updated by the END instruction.

■Clear timing

The timing when the device is cleared is as follows.
  • Power  OFF

ON

 • Reset
  • STOP/PAUSE

RUN

 • When measurement is started by the HIOEN instruction

When the HCMOV instruction is used, the latest value can be read.

SD5087, SD5086

CH4 pulse width maximum value

The maximum value of the pulse width is stored.

00000000H

R/W

SD5089, SD5088

CH4 pulse width minimum value

The minimum value of the pulse width is stored.

FFFFFFFFH

R/W

SD5091, SD5090

CH4 period latest value

The latest value of the period is stored.

00000000H

R/W

SD5093, SD5092

CH4 period maximum value

The maximum value of the period is stored.

00000000H

R/W

SD5095, SD5094

CH4 period minimum value

The minimum value of the period is stored.

FFFFFFFFH

R/W

SM5020

SM5021

SM5022

SM5023

SM5036

SM5037

SM5038

SM5039