Mitsubishi Electronics FX3G User Manual

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3S

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3G

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3GC

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3U

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3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

36 Interrupt Function and Pulse Catch Function

3) Signal delay time measurement

The delay time from the rising edge of the input signal from X000 to the rising edge of the input signal from X001
is measured.

X000

This duration is measured.

X001

OFF

ON

OFF

ON

FNC 04

EI

M8076

Step

0

FNC 06

FEND

I101

interrupt

pointer

X001 Rising edge interrupt

Interrupts are enabled after the EI (FNC 04) instruction.
The main program is described.

X000 is used for the pulse width/pulse period

measurement function.

The ring counter value at the rising edge of the input

signal from X000 stored in D8074 and D8075 is

transferred to D1 and D0.

M8075

M8000

RUN

monitor

FNC 12

DMOV D8074

D0

M8077

FNC 12

DMOV D8080

D2

X001 is used for the pulse width/pulse period

measurement function.

The ring counter value at the rising edge of the input

signal from X001 stored in D8080 and D8081 is

transferred to D3 and D2.
The value "Ring counter value at the rising edge of

the input signal from X001 - Ring counter value at the

rising edge of the input signal from X000" is stored in

D9 and D8.

The interrupt routine is executed at the rising edge of

the input signal from X001.

Pulse width
/Pulse period
measurement
setting flag

FNC 03

IRET

END

User program

Interrupt return

User program (Interrupt at the rising edge(X001))

FNC230

LDD>=

D0

FNC234

ANDD<

D2

K0

FNC 21

DSUB

H7FFFFFFF

FNC 21

DSUB

D2

H80000000

D6

FNC 20

DADD

D4

D6

D8

FNC 24

DINC

D8

FNC226

LDD<

D0

FNC238

ANDD>=

D2

K0

FNC 21

DSUB

HFFFFFFFF

FNC 20

DADD

D2

D4

D8

FNC 24

DINC

D8

M8000

FNC 23

DDIV

D8

K60

D10

X000 Rising edge ring counter value:

                                                H0 to H7FFFFFFF

X001 Rising edge ring counter value:

                                                H80000000 to HFFFFFFFF

X000 Rising edge ring counter value:

                                                H80000000 to HFFFFFFFF

X001 Rising edge ring counter value:

                                                H0 to H7FFFFFFF

The obtained value is converted into a value in units

of 10 

µs.

K0

K0

When either one between the ring counter value at the rising edge of the input signal from X000 and

the ring counter value at the rising edge of the input signal from X001 is located ranging from

H80000000 to HFFFFFFFF, the following process is executed, and the value "Ring counter value

at the rising edge of the input signal from X001 - Ring counter value at the rising edge of the input

signal from X000" is stored in D9 and D8*

1

.

D2

D0

D8

FNC 21

DSUB

D0

D4

D0

D4