Mitsubishi Electronics FX1S Instrukcja Użytkownika Pobierz pdf (Strona 85)

FX Series Programmable Controllers Devices in Detail 4

4-11

4.6 Interrupt Pointers

Device Mnemonic: I

Purpose: Interrupt program marker

Alias: Interrupt

High speed interrupt

Available forms: Label: appears on the left of the left hand bus bar when the program is

viewed in ladder mode

(see ➀ in the example device usage diagram).

Devices numbered in: Special numbering system based on interrupt device used and input

triggering method

Further uses: Input interrupts - see page 4-12

Timer interrupts - see page 4-12

Disabling interrupts - see page 4-13

Counter interrupts - see page 4-13

Example device usage:

Additional applied instructions:

• Interrupts are made up of an interrupt device, an interrupt pointer and various usage of

three, dedicated interrupt applied instructions;

- IRET function 03: interrupt return - see page 5-9

- EI function 04: enable interrupt - see page 5-9

- DI function 05: disable interrupt - see page 5-9

Nested levels:

• While an interrupt is processing all other interrupts are disabled. To achieve nested

interrupts the EI-DI instruction must be programmed within an interrupt routine.

Interrupts can be nested for two levels.

Pointer position:

• Interrupt pointers may only be used after an FEND instruction (first end instruction,

function 06).

I101

IRET

FEND

END

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Mitsubishi Electronics FX1S Instrukcja Użytkownika Strona 85