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6.1 Interrupt Instructions

KV-300

KV-10/80

3-269

Chapter 6 Interrupts, High-speed Counters, Positioning Control

Interrupt priority

If two or more interrupts are generated at different timings, interrupt routines are

executed in the order that interrupts are generated.

If two or more interrupts are generated simultaneously, interrupt routines are

executed according to the priority shown below.

CTC0 > CTC1 > CTC2 > CTC3 > 0000 > 0001 > 0002 > 0003

* Note that the above priority differs from that for other KV PLCs (KV-10/16/24/40/

80).

The priority is: 0000 > 0001 > 0002 > 0003 > CTC2 > CTC3 > CTC0 > CTC1.

Note 1: During execution of one interrupt routine, execution of other interrupt rou-

tines is inhibited. (One interrupt routine can be executed inside another interrupt

routine by inserting EI.)

Note 2: If other interrupts are generated during execution of one interrupt routine,

the routines of these interrupts are executed after completion of the first interrupt

routine in the order that they are generated. Note that generation of up to 8 levels of

interrupt nesting or up to 8 individual interrupts can be stored during execution of

interrupt routine. However, generation of an interrupt is ignored if generation of the

same interrupt has already been stored.

Interrupt routine

• Execute EI to enable interrupt.

• Be sure to insert INT between END and ENDH.

• Be sure to shorten the input time constant by using HSP or by turning ON special

utility relay 2813.

Instructions that cannot be used in the INT-RETI block

TMR, TMH, TMS, DIFU, DIFD, W-ON, W-OFF, W-UE, W-DE, STG, JMP, ENDS,

HKEY, ITVL, @xxxx (instruction), C, UDC, SFT

2008

2813

SET

END

INT

XXXXX

RETI

ENDH

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Keyence Visual KV Series Manual de usuario Pagina 293