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6.1 Interrupt Instructions

KV-300

KV-10/80

3-271

Chapter 6 Interrupts, High-speed Counters, Positioning Control

6.1.2 Interrupt Instructions

DI: Interrupt Disabled Disables execution of interrupt.

EI: Interrupt Enabled Enables execution of interrupt.

Key operations

Operand

Example

Coding

Description

When 1000 is ON, execution of interrupt is enabled. When 1000 is OFF, execution

of interrupt is disabled. Interrupts are enabled between EI instruction and DI instruc-

tion.

Therefore, once EI is executed, interrupt is enabled until it is disabled by DI.

With the KV, any interrupt is disabled when the operation is started.

DI instruction disables execution of interrupt. Use this instruction to temporarily

disable interrupt.

EI instruction enables the execution of interrupt. Use this instruction to release

interrupt disabled by DI instruction.

During execution of an interrupt, any other interrupt is disabled.To execute another

interrupt during execution of the previous interrupt, include EI instruction in this first

interrupt. Interrupts can be nested up to 8 levels by executing EI in each interrupt

routine.

Note 1: Generation of up to 8 levels of interrupt nesting or up to 8 individual inter-

rupts can be stored while interrupt is disabled. These interrupts are executed after EI

has been executed.

Note 2: Generation of INT CTC is erased from the storage when RES CTC is

executed.

AND

FNC

RES

SET

FNC

ORL

AND

ENT

R-SRCH

RES

FNC

SET

FNC

ENT

R-SRCH

1000

Line No. Instruction Operand

0000 LD 1000

0001 EI

: :

0021 LDB 1000

0022 DI

DI / EI

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