Mitsubishi Electronics FX3G Benutzerhandbuch

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

4 Devices in Detail

→ For details on counter interrupt function, refer to Section 36.6.

The PLC executes an interrupt routine based on the comparison result obtained by the comparison set instruction for
high-speed counter (DHSCS instruction).
Use these pointers for control requiring an interrupt routine based on the counting result from high-speed counters.

*1.

This function is supported only in FX

3U

/FX

3UC

 PLCs.

*2.

Cleared when the PLC mode switches from RUN to STOP.

I010

 M8059

*2

I040

 M8059

*2

I020

I050

I030

I060

Step

0

I620

Pointer for

interrupt

Interrupt

routine

Interrupt is

enabled

Main program

is finished

Main

program

Interrupt at every 20 ms

Interrupt return

FNC 04

EI

FNC 06

FEND

FNC 03

IRET

END

"FEND" indicates the end of the main

program.

Make sure to describe an interrupt routine

after "FEND".

•

The PLC executes an interrupt routine at every

20 ms.

The PLC returns to main program by IRET

instruction.

•

Timer interrupt is enabled after EI instruction.

It is not necessary to program DI (disable

interrupt) instruction when no zone to disable

timer interrupt is needed.

•

M8000

RUN
monitor

FNC 04

EI

FNC 53

DHSCS K1000 C255

FNC 03

IRET

END

Step

0

C255

I010

Interrupt pointer
number is
specified

FNC 06

FEND

Interrupt routine

(interrupt program)

I010

Pointer for

interrupt

Counter interrupt is specified

Interrupt return

K2,147,483,647

Enable interrupt after EI instruction, and

describe the main program.

•

Drive the coil of a high-speed counter, and

specify an interrupt pointer in DHSCS (FNC 53)

instruction.

•

When the current value of C255 changes from

"999" to "1000" or from "1001" to "1000", the

interrupt routine is executed.

For example of interrupt program, refer to an

input interrupt described above.

•